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【Redis】常用命令介绍

转载 作者:我是一只小鸟 更新时间:2023-05-08 06:31:12 36 4
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1、Redis常用基本命令

官方文档:https://redis.io/commands/ 。

参考文档:http://redisdoc.com/ 。

                          
                            #可以使用help命令查看各redis命令用法
                          
                          
[root@Client-Ubuntu- 1804 - 250 :~]# redis-cli -a redis --no-auth- warning help redis -cli 5.0 . 14 To get help about Redis commands type: " help @<group> " to get a list of commands in <group> " help <command> " for help on <command> " help <tab> " to get a list of possible help topics " quit " to exit To set redis - cli preferences: " :set hints " enable online hints " :set nohints " disable online hints Set your preferences in ~/.redisclirc
                          [root@Client-Ubuntu-
                          
                            1804
                          
                          -
                          
                            250
                          
                          :~]# redis-cli -a redis --no-auth-
                          
                            warning


                             #查看info命令帮助 
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > help 
                          
                            info
                          
                          
                            

  INFO [section]
  summary: Get information and statistics about the server
  since: 
                          
                          
                            1.0
                          
                          .
                          
                            0
                          
                          
                            
  group: server



                             #查看set命令帮助 
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             help set

  SET key value [expiration EX seconds
                          
                          |PX milliseconds] [NX|
                          
                            XX]
  summary: Set the 
                          
                          
                            string
                          
                          
                             value of a key
  since: 
                          
                          
                            1.0
                          
                          .
                          
                            0
                          
                          
                            
  group: 
                          
                          
                            string
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                        

  。

 1、INFO

查看当前节点运行状态 。

                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            > help 
                            
                              info
                            
                            
                              

  INFO [section]
  summary: Get information and statistics about the server
  since: 
                            
                            
                              1.0
                            
                            .
                            
                              0
                            
                            
                              
  group: server


                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            > 
                            
                              info
                            
                            
                              
# Server
redis_version:
                            
                            
                              5.0
                            
                            .
                            
                              14
                            
                            
                              
redis_git_sha1:
                            
                            
                              00000000
                            
                            
                              
redis_git_dirty:
                            
                            
                              0
                            
                            
                              
redis_build_id:5d32a2d9ed5f67d5
redis_mode:standalone
os:Linux 
                            
                            
                              4.15
                            
                            .
                            
                              0
                            
                            -
                            
                              210
                            
                            -
                            
                              generic x86_64
arch_bits:
                            
                            
                              64
                            
                            
                              
multiplexing_api:epoll
atomicvar_api:atomic
                            
                            -
                            
                              builtin
gcc_version:
                            
                            
                              7.5
                            
                            .
                            
                              0
                            
                            
                              
process_id:
                            
                            
                              6069
                            
                            
                              
run_id:0e67fcd27ff6ae2589ff90ac2516bd52269f2965
tcp_port:
                            
                            
                              6379
                            
                            
                              
uptime_in_seconds:
                            
                            
                              924
                            
                            
                              
uptime_in_days:
                            
                            
                              0
                            
                            
                              
hz:
                            
                            
                              10
                            
                            
                              
configured_hz:
                            
                            
                              10
                            
                            
                              
lru_clock:
                            
                            
                              5745912
                            
                            
                              
executable:
                            
                            /app/redis/bin/redis-
                            
                              server
config_file:
                            
                            /app/redis/etc/
                            
                              redis_6379.conf

# Clients
connected_clients:
                            
                            
                              1
                            
                            
                              
client_recent_max_input_buffer:
                            
                            
                              2
                            
                            
                              
client_recent_max_output_buffer:
                            
                            
                              0
                            
                            
                              
blocked_clients:
                            
                            
                              0
                            
                            
                              

# Memory
used_memory:
                            
                            
                              943496
                            
                            
                              
used_memory_human:
                            
                            
                              921
                            
                            
                              .38K
used_memory_rss:
                            
                            
                              7237632
                            
                            
                              
used_memory_rss_human:
                            
                            
                              6.90M
                            
                            
                              
used_memory_peak:
                            
                            
                              943496
                            
                            
                              
used_memory_peak_human:
                            
                            
                              921
                            
                            
                              .38K
used_memory_peak_perc:
                            
                            
                              100.11
                            
                            %
                            
                              
used_memory_overhead:
                            
                            
                              898934
                            
                            
                              
used_memory_startup:
                            
                            
                              791488
                            
                            
                              
used_memory_dataset:
                            
                            
                              44562
                            
                            
                              
used_memory_dataset_perc:
                            
                            
                              29.32
                            
                            %
                            
                              
allocator_allocated:
                            
                            
                              1129952
                            
                            
                              
allocator_active:
                            
                            
                              1409024
                            
                            
                              
allocator_resident:
                            
                            
                              14368768
                            
                            
                              
total_system_memory:
                            
                            
                              1006243840
                            
                            
                              
total_system_memory_human:
                            
                            
                              959.63M
                            
                            
                              
used_memory_lua:
                            
                            
                              37888
                            
                            
                              
used_memory_lua_human:
                            
                            
                              37
                            
                            
                              .00K
used_memory_scripts:
                            
                            
                              0
                            
                            
                              
used_memory_scripts_human:0B
number_of_cached_scripts:
                            
                            
                              0
                            
                            
                              
maxmemory:
                            
                            
                              0
                            
                            
                              
maxmemory_human:0B
maxmemory_policy:noeviction
allocator_frag_ratio:
                            
                            
                              1.25
                            
                            
                              
allocator_frag_bytes:
                            
                            
                              279072
                            
                            
                              
allocator_rss_ratio:
                            
                            
                              10.20
                            
                            
                              
allocator_rss_bytes:
                            
                            
                              12959744
                            
                            
                              
rss_overhead_ratio:
                            
                            
                              0.50
                            
                            
                              
rss_overhead_bytes:
                            
                            -
                            
                              7131136
                            
                            
                              
mem_fragmentation_ratio:
                            
                            
                              8.03
                            
                            
                              
mem_fragmentation_bytes:
                            
                            
                              6336128
                            
                            
                              
mem_not_counted_for_evict:
                            
                            
                              1368
                            
                            
                              
mem_replication_backlog:
                            
                            
                              0
                            
                            
                              
mem_clients_slaves:
                            
                            
                              0
                            
                            
                              
mem_clients_normal:
                            
                            
                              49694
                            
                            
                              
mem_aof_buffer:
                            
                            
                              1368
                            
                            
                              
mem_allocator:jemalloc
                            
                            -
                            
                              5.1
                            
                            .
                            
                              0
                            
                            
                              
active_defrag_running:
                            
                            
                              0
                            
                            
                              
lazyfree_pending_objects:
                            
                            
                              0
                            
                            
                              

# Persistence
loading:
                            
                            
                              0
                            
                            
                              
rdb_changes_since_last_save:
                            
                            
                              658
                            
                            
                              
rdb_bgsave_in_progress:
                            
                            
                              0
                            
                            
                              
rdb_last_save_time:
                            
                            
                              1683467492
                            
                            
                              
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:
                            
                            
                              0
                            
                            
                              
rdb_current_bgsave_time_sec:
                            
                            -
                            
                              1
                            
                            
                              
rdb_last_cow_size:
                            
                            
                              233472
                            
                            
                              
aof_enabled:
                            
                            
                              1
                            
                            
                              
aof_rewrite_in_progress:
                            
                            
                              0
                            
                            
                              
aof_rewrite_scheduled:
                            
                            
                              0
                            
                            
                              
aof_last_rewrite_time_sec:
                            
                            -
                            
                              1
                            
                            
                              
aof_current_rewrite_time_sec:
                            
                            -
                            
                              1
                            
                            
                              
aof_last_bgrewrite_status:ok
aof_last_write_status:ok
aof_last_cow_size:
                            
                            
                              0
                            
                            
                              
aof_current_size:
                            
                            
                              40803
                            
                            
                              
aof_base_size:
                            
                            
                              0
                            
                            
                              
aof_pending_rewrite:
                            
                            
                              0
                            
                            
                              
aof_buffer_length:
                            
                            
                              0
                            
                            
                              
aof_rewrite_buffer_length:
                            
                            
                              0
                            
                            
                              
aof_pending_bio_fsync:
                            
                            
                              0
                            
                            
                              
aof_delayed_fsync:
                            
                            
                              0
                            
                            
                              

# Stats
total_connections_received:
                            
                            
                              12
                            
                            
                              
total_commands_processed:
                            
                            
                              1019
                            
                            
                              
instantaneous_ops_per_sec:
                            
                            
                              0
                            
                            
                              
total_net_input_bytes:
                            
                            
                              41255
                            
                            
                              
total_net_output_bytes:
                            
                            
                              46481
                            
                            
                              
instantaneous_input_kbps:
                            
                            
                              0.00
                            
                            
                              
instantaneous_output_kbps:
                            
                            
                              0.00
                            
                            
                              
rejected_connections:
                            
                            
                              0
                            
                            
                              
sync_full:
                            
                            
                              0
                            
                            
                              
sync_partial_ok:
                            
                            
                              0
                            
                            
                              
sync_partial_err:
                            
                            
                              0
                            
                            
                              
expired_keys:
                            
                            
                              0
                            
                            
                              
expired_stale_perc:
                            
                            
                              0.00
                            
                            
                              
expired_time_cap_reached_count:
                            
                            
                              0
                            
                            
                              
evicted_keys:
                            
                            
                              0
                            
                            
                              
keyspace_hits:
                            
                            
                              0
                            
                            
                              
keyspace_misses:
                            
                            
                              0
                            
                            
                              
pubsub_channels:
                            
                            
                              0
                            
                            
                              
pubsub_patterns:
                            
                            
                              0
                            
                            
                              
latest_fork_usec:
                            
                            
                              523
                            
                            
                              
migrate_cached_sockets:
                            
                            
                              0
                            
                            
                              
slave_expires_tracked_keys:
                            
                            
                              0
                            
                            
                              
active_defrag_hits:
                            
                            
                              0
                            
                            
                              
active_defrag_misses:
                            
                            
                              0
                            
                            
                              
active_defrag_key_hits:
                            
                            
                              0
                            
                            
                              
active_defrag_key_misses:
                            
                            
                              0
                            
                            
                              

# Replication
role:master
connected_slaves:
                            
                            
                              0
                            
                            
                              
master_replid:518de7012facc8a7fe780ed4eb5f4de015f01d56
master_replid2:
                            
                            
                              0000000000000000000000000000000000000000
                            
                            
                              
master_repl_offset:
                            
                            
                              0
                            
                            
                              
second_repl_offset:
                            
                            -
                            
                              1
                            
                            
                              
repl_backlog_active:
                            
                            
                              0
                            
                            
                              
repl_backlog_size:
                            
                            
                              1048576
                            
                            
                              
repl_backlog_first_byte_offset:
                            
                            
                              0
                            
                            
                              
repl_backlog_histlen:
                            
                            
                              0
                            
                            
                              

# CPU
used_cpu_sys:
                            
                            
                              0.365552
                            
                            
                              
used_cpu_user:
                            
                            
                              0.570244
                            
                            
                              
used_cpu_sys_children:
                            
                            
                              0.000000
                            
                            
                              
used_cpu_user_children:
                            
                            
                              0.001215
                            
                            
                              

# Cluster
cluster_enabled:
                            
                            
                              0
                            
                            
                              

# Keyspace
db0:keys
                            
                            =
                            
                              1000
                            
                            ,expires=
                            
                              0
                            
                            ,avg_ttl=
                            
                              0
                            
                          
info

可以在INFO 后补充筛选内容 。

                          
                            #查看当前节点CPU信息

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                          
                            info
                          
                          
                             CPU
# CPU
used_cpu_sys:
                          
                          
                            0.508881
                          
                          
                            
used_cpu_user:
                          
                          
                            0.848135
                          
                          
                            
used_cpu_sys_children:
                          
                          
                            0.000000
                          
                          
                            
used_cpu_user_children:
                          
                          
                            0.003046
                          
                          
                            

#查看当前节点Server信息

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                          
                            info
                          
                          
                             Server
# Server
redis_version:
                          
                          
                            5.0
                          
                          .
                          
                            14
                          
                          
                            
redis_git_sha1:
                          
                          
                            00000000
                          
                          
                            
redis_git_dirty:
                          
                          
                            0
                          
                          
                            
redis_build_id:5d32a2d9ed5f67d5
redis_mode:standalone
os:Linux 
                          
                          
                            4.15
                          
                          .
                          
                            0
                          
                          -
                          
                            210
                          
                          -
                          
                            generic x86_64
arch_bits:
                          
                          
                            64
                          
                          
                            
multiplexing_api:epoll
atomicvar_api:atomic
                          
                          -
                          
                            builtin
gcc_version:
                          
                          
                            7.5
                          
                          .
                          
                            0
                          
                          
                            
process_id:
                          
                          
                            6069
                          
                          
                            
run_id:0e67fcd27ff6ae2589ff90ac2516bd52269f2965
tcp_port:
                          
                          
                            6379
                          
                          
                            
uptime_in_seconds:
                          
                          
                            1358
                          
                          
                            
uptime_in_days:
                          
                          
                            0
                          
                          
                            
hz:
                          
                          
                            10
                          
                          
                            
configured_hz:
                          
                          
                            10
                          
                          
                            
lru_clock:
                          
                          
                            5746346
                          
                          
                            
executable:
                          
                          /app/redis/bin/redis-
                          
                            server
config_file:
                          
                          /app/redis/etc/redis_6379.conf
                        

  。

 2、SELECT

切换数据库,类似于MySQL是 USE DATABASES,

在Cluster模式下不支持多DB模式,会出现以下错误提示 。

                            
                              10.0
                            
                            .
                            
                              0.20
                            
                            :
                            
                              6379
                            
                            > 
                            
                              info
                            
                            
                               cluster
# Cluster
cluster_enabled:
                            
                            
                              1
                            
                            
                              10.0
                            
                            .
                            
                              0.20
                            
                            :
                            
                              6379
                            
                            > 
                            
                              select
                            
                            
                              1
                            
                            
                              
(error) ERR SELECT is not allowed in cluster mode
                            
                          
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            > help 
                            
                              select
                            
                            
                              

  SELECT index
  summary: Change the selected database 
                            
                            
                              for
                            
                            
                               the current connection
  since: 
                            
                            
                              1.0
                            
                            .
                            
                              0
                            
                            
                              
  group: connection


                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            > 
                            
                              select
                            
                            
                              1
                            
                            
                              
OK

                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              1
                            
                            ]> 
                            
                              select
                            
                            
                              2
                            
                            
                              
OK

                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              2
                            
                            ]> 
                            
                              select
                            
                            
                              3
                            
                            
                              
OK

                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              3
                            
                            ]> 
                          
select

  。

 3、KEYS

查看当前数据库下所有的key (数据量大时会对数据库造成巨大压力,此命令慎用) 。

此命令仅查询当前db下的数据 。

  。

                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            > 
                            
                              select
                            
                            
                              1
                            
                            
                              
OK

                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              1
                            
                            ]> keys *
                            
                              
(empty list or set)

                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              1
                            
                            ]> 
                            
                              info
                            
                            
                               KeySpace
# Keyspace
db0:keys
                            
                            =
                            
                              1000
                            
                            ,expires=
                            
                              0
                            
                            ,avg_ttl=
                            
                              0
                            
                          

  。

                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             help keys

  KEYS pattern
  summary: Find all keys matching the given pattern
  since: 
                          
                          
                            1.0
                          
                          .
                          
                            0
                          
                          
                            
  group: generic



                             #? 占位符 
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > keys key_?
 
                          
                            1
                          
                          ) 
                          
                            "
                          
                          
                            key_8
                          
                          
                            "
                          
                          
                            2
                          
                          ) 
                          
                            "
                          
                          
                            key_5
                          
                          
                            "
                          
                          
                            3
                          
                          ) 
                          
                            "
                          
                          
                            key_4
                          
                          
                            "
                          
                          
                            4
                          
                          ) 
                          
                            "
                          
                          
                            key_9
                          
                          
                            "
                          
                          
                            5
                          
                          ) 
                          
                            "
                          
                          
                            key_0
                          
                          
                            "
                          
                          
                            6
                          
                          ) 
                          
                            "
                          
                          
                            key_2
                          
                          
                            "
                          
                          
                            7
                          
                          ) 
                          
                            "
                          
                          
                            key_1
                          
                          
                            "
                          
                          
                            8
                          
                          ) 
                          
                            "
                          
                          
                            key_3
                          
                          
                            "
                          
                          
                            9
                          
                          ) 
                          
                            "
                          
                          
                            key_6
                          
                          
                            "
                          
                          
                            10
                          
                          ) 
                          
                            "
                          
                          
                            key_7
                          
                          
                            "
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > keys key_2?
 
                          
                            1
                          
                          ) 
                          
                            "
                          
                          
                            key_27
                          
                          
                            "
                          
                          
                            2
                          
                          ) 
                          
                            "
                          
                          
                            key_28
                          
                          
                            "
                          
                          
                            3
                          
                          ) 
                          
                            "
                          
                          
                            key_22
                          
                          
                            "
                          
                          
                            4
                          
                          ) 
                          
                            "
                          
                          
                            key_26
                          
                          
                            "
                          
                          
                            5
                          
                          ) 
                          
                            "
                          
                          
                            key_21
                          
                          
                            "
                          
                          
                            6
                          
                          ) 
                          
                            "
                          
                          
                            key_20
                          
                          
                            "
                          
                          
                            7
                          
                          ) 
                          
                            "
                          
                          
                            key_25
                          
                          
                            "
                          
                          
                            8
                          
                          ) 
                          
                            "
                          
                          
                            key_23
                          
                          
                            "
                          
                          
                            9
                          
                          ) 
                          
                            "
                          
                          
                            key_24
                          
                          
                            "
                          
                          
                            10
                          
                          ) 
                          
                            "
                          
                          
                            key_29
                          
                          
                            "
                          
                          
                            

#*
                          
                          
                             通配 
                            
#
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > keys key_9*
  
                          
                            1
                          
                          ) 
                          
                            "
                          
                          
                            key_995
                          
                          
                            "
                          
                          
                            2
                          
                          ) 
                          
                            "
                          
                          
                            key_957
                          
                          
                            "
                          
                          
                            3
                          
                          ) 
                          
                            "
                          
                          
                            key_988
                          
                          
                            "
                          
                          
                            4
                          
                          ) 
                          
                            "
                          
                          
                            key_98
                          
                          
                            "
                          
                          
                            5
                          
                          ) 
                          
                            "
                          
                          
                            key_990
                          
                          
                            "
                          
                          
                            6
                          
                          ) 
                          
                            "
                          
                          
                            key_959
                          
                          
                            "
                          
                          
                            7
                          
                          ) 
                          
                            "
                          
                          
                            key_949
                          
                          
                            "
                          
                          
                            8
                          
                          ) 
                          
                            "
                          
                          
                            key_984
                          
                          
                            "
                          
                          
                            9
                          
                          ) 
                          
                            "
                          
                          
                            key_999
                          
                          
                            "
                          
                          
                            10
                          
                          ) 
                          
                            "
                          
                          
                            key_950
                          
                          
                            "
                          
                          
                            11
                          
                          ) 
                          
                            "
                          
                          
                            key_976
                          
                          
                            "
                          
                          
                            12
                          
                          ) 
                          
                            "
                          
                          
                            key_912
                          
                          
                            "
                          
                          
                            13
                          
                          ) 
                          
                            "
                          
                          
                            key_991
                          
                          
                            "
                          
                          
                            14
                          
                          ) 
                          
                            "
                          
                          
                            key_944
                          
                          
                            "
                          
                          
                            15
                          
                          ) 
                          
                            "
                          
                          
                            key_987
                          
                          
                            "
                          
                          
                            16
                          
                          ) 
                          
                            "
                          
                          
                            key_954
                          
                          
                            "
                          
                          
                            17
                          
                          ) 
                          
                            "
                          
                          
                            key_981
                          
                          
                            "
                          
                          
                            18
                          
                          ) 
                          
                            "
                          
                          
                            key_951
                          
                          
                            "
                          
                          
                            19
                          
                          ) 
                          
                            "
                          
                          
                            key_998
                          
                          
                            "
                          
                          
                            20
                          
                          ) 
                          
                            "
                          
                          
                            key_916
                          
                          
                            "
                          
                          
                            21
                          
                          ) 
                          
                            "
                          
                          
                            key_986
                          
                          
                            "
                          
                          
                            22
                          
                          ) 
                          
                            "
                          
                          
                            key_933
                          
                          
                            "
                          
                          
                            23
                          
                          ) 
                          
                            "
                          
                          
                            key_996
                          
                          
                            "
                          
                          
                            24
                          
                          ) 
                          
                            "
                          
                          
                            key_918
                          
                          
                            "
                          
                          
                            25
                          
                          ) 
                          
                            "
                          
                          
                            key_942
                          
                          
                            "
                          
                          
                            26
                          
                          ) 
                          
                            "
                          
                          
                            key_906
                          
                          
                            "
                          
                          
                            27
                          
                          ) 
                          
                            "
                          
                          
                            key_925
                          
                          
                            "
                          
                          
                            28
                          
                          ) 
                          
                            "
                          
                          
                            key_965
                          
                          
                            "
                          
                          
                            29
                          
                          ) 
                          
                            "
                          
                          
                            key_964
                          
                          
                            "
                          
                          
                            30
                          
                          ) 
                          
                            "
                          
                          
                            key_917
                          
                          
                            "
                          
                          
                            31
                          
                          ) 
                          
                            "
                          
                          
                            key_9
                          
                          
                            "
                          
                          
                            32
                          
                          ) 
                          
                            "
                          
                          
                            key_95
                          
                          
                            "
                          
                          
                            33
                          
                          ) 
                          
                            "
                          
                          
                            key_994
                          
                          
                            "
                          
                          
                            34
                          
                          ) 
                          
                            "
                          
                          
                            key_94
                          
                          
                            "
                          
                          
                            35
                          
                          ) 
                          
                            "
                          
                          
                            key_961
                          
                          
                            "
                          
                          
                            36
                          
                          ) 
                          
                            "
                          
                          
                            key_901
                          
                          
                            "
                          
                          
                            37
                          
                          ) 
                          
                            "
                          
                          
                            key_962
                          
                          
                            "
                          
                          
                            38
                          
                          ) 
                          
                            "
                          
                          
                            key_909
                          
                          
                            "
                          
                          
                            39
                          
                          ) 
                          
                            "
                          
                          
                            key_971
                          
                          
                            "
                          
                          
                            40
                          
                          ) 
                          
                            "
                          
                          
                            key_966
                          
                          
                            "
                          
                          
                            41
                          
                          ) 
                          
                            "
                          
                          
                            key_968
                          
                          
                            "
                          
                          
                            42
                          
                          ) 
                          
                            "
                          
                          
                            key_913
                          
                          
                            "
                          
                          
                            43
                          
                          ) 
                          
                            "
                          
                          
                            key_960
                          
                          
                            "
                          
                          
                            44
                          
                          ) 
                          
                            "
                          
                          
                            key_937
                          
                          
                            "
                          
                          
                            45
                          
                          ) 
                          
                            "
                          
                          
                            key_977
                          
                          
                            "
                          
                          
                            46
                          
                          ) 
                          
                            "
                          
                          
                            key_90
                          
                          
                            "
                          
                          
                            47
                          
                          ) 
                          
                            "
                          
                          
                            key_926
                          
                          
                            "
                          
                          
                            48
                          
                          ) 
                          
                            "
                          
                          
                            key_93
                          
                          
                            "
                          
                          
                            49
                          
                          ) 
                          
                            "
                          
                          
                            key_955
                          
                          
                            "
                          
                          
                            50
                          
                          ) 
                          
                            "
                          
                          
                            key_970
                          
                          
                            "
                          
                          
                            51
                          
                          ) 
                          
                            "
                          
                          
                            key_939
                          
                          
                            "
                          
                          
                            52
                          
                          ) 
                          
                            "
                          
                          
                            key_908
                          
                          
                            "
                          
                          
                            53
                          
                          ) 
                          
                            "
                          
                          
                            key_929
                          
                          
                            "
                          
                          
                            54
                          
                          ) 
                          
                            "
                          
                          
                            key_972
                          
                          
                            "
                          
                          
                            55
                          
                          ) 
                          
                            "
                          
                          
                            key_902
                          
                          
                            "
                          
                          
                            56
                          
                          ) 
                          
                            "
                          
                          
                            key_948
                          
                          
                            "
                          
                          
                            57
                          
                          ) 
                          
                            "
                          
                          
                            key_956
                          
                          
                            "
                          
                          
                            58
                          
                          ) 
                          
                            "
                          
                          
                            key_930
                          
                          
                            "
                          
                          
                            59
                          
                          ) 
                          
                            "
                          
                          
                            key_978
                          
                          
                            "
                          
                          
                            60
                          
                          ) 
                          
                            "
                          
                          
                            key_99
                          
                          
                            "
                          
                          
                            61
                          
                          ) 
                          
                            "
                          
                          
                            key_924
                          
                          
                            "
                          
                          
                            62
                          
                          ) 
                          
                            "
                          
                          
                            key_915
                          
                          
                            "
                          
                          
                            63
                          
                          ) 
                          
                            "
                          
                          
                            key_943
                          
                          
                            "
                          
                          
                            64
                          
                          ) 
                          
                            "
                          
                          
                            key_932
                          
                          
                            "
                          
                          
                            65
                          
                          ) 
                          
                            "
                          
                          
                            key_928
                          
                          
                            "
                          
                          
                            66
                          
                          ) 
                          
                            "
                          
                          
                            key_914
                          
                          
                            "
                          
                          
                            67
                          
                          ) 
                          
                            "
                          
                          
                            key_982
                          
                          
                            "
                          
                          
                            68
                          
                          ) 
                          
                            "
                          
                          
                            key_905
                          
                          
                            "
                          
                          
                            69
                          
                          ) 
                          
                            "
                          
                          
                            key_974
                          
                          
                            "
                          
                          
                            70
                          
                          ) 
                          
                            "
                          
                          
                            key_979
                          
                          
                            "
                          
                          
                            71
                          
                          ) 
                          
                            "
                          
                          
                            key_940
                          
                          
                            "
                          
                          
                            72
                          
                          ) 
                          
                            "
                          
                          
                            key_941
                          
                          
                            "
                          
                          
                            73
                          
                          ) 
                          
                            "
                          
                          
                            key_958
                          
                          
                            "
                          
                          
                            74
                          
                          ) 
                          
                            "
                          
                          
                            key_997
                          
                          
                            "
                          
                          
                            75
                          
                          ) 
                          
                            "
                          
                          
                            key_993
                          
                          
                            "
                          
                          
                            76
                          
                          ) 
                          
                            "
                          
                          
                            key_922
                          
                          
                            "
                          
                          
                            77
                          
                          ) 
                          
                            "
                          
                          
                            key_92
                          
                          
                            "
                          
                          
                            78
                          
                          ) 
                          
                            "
                          
                          
                            key_980
                          
                          
                            "
                          
                          
                            79
                          
                          ) 
                          
                            "
                          
                          
                            key_934
                          
                          
                            "
                          
                          
                            80
                          
                          ) 
                          
                            "
                          
                          
                            key_911
                          
                          
                            "
                          
                          
                            81
                          
                          ) 
                          
                            "
                          
                          
                            key_946
                          
                          
                            "
                          
                          
                            82
                          
                          ) 
                          
                            "
                          
                          
                            key_923
                          
                          
                            "
                          
                          
                            83
                          
                          ) 
                          
                            "
                          
                          
                            key_945
                          
                          
                            "
                          
                          
                            84
                          
                          ) 
                          
                            "
                          
                          
                            key_992
                          
                          
                            "
                          
                          
                            85
                          
                          ) 
                          
                            "
                          
                          
                            key_969
                          
                          
                            "
                          
                          
                            86
                          
                          ) 
                          
                            "
                          
                          
                            key_921
                          
                          
                            "
                          
                          
                            87
                          
                          ) 
                          
                            "
                          
                          
                            key_910
                          
                          
                            "
                          
                          
                            88
                          
                          ) 
                          
                            "
                          
                          
                            key_936
                          
                          
                            "
                          
                          
                            89
                          
                          ) 
                          
                            "
                          
                          
                            key_983
                          
                          
                            "
                          
                          
                            90
                          
                          ) 
                          
                            "
                          
                          
                            key_903
                          
                          
                            "
                          
                          
                            91
                          
                          ) 
                          
                            "
                          
                          
                            key_989
                          
                          
                            "
                          
                          
                            92
                          
                          ) 
                          
                            "
                          
                          
                            key_931
                          
                          
                            "
                          
                          
                            93
                          
                          ) 
                          
                            "
                          
                          
                            key_919
                          
                          
                            "
                          
                          
                            94
                          
                          ) 
                          
                            "
                          
                          
                            key_953
                          
                          
                            "
                          
                          
                            95
                          
                          ) 
                          
                            "
                          
                          
                            key_947
                          
                          
                            "
                          
                          
                            96
                          
                          ) 
                          
                            "
                          
                          
                            key_96
                          
                          
                            "
                          
                          
                            97
                          
                          ) 
                          
                            "
                          
                          
                            key_935
                          
                          
                            "
                          
                          
                            98
                          
                          ) 
                          
                            "
                          
                          
                            key_91
                          
                          
                            "
                          
                          
                            99
                          
                          ) 
                          
                            "
                          
                          
                            key_907
                          
                          
                            "
                          
                          
                            100
                          
                          ) 
                          
                            "
                          
                          
                            key_952
                          
                          
                            "
                          
                          
                            101
                          
                          ) 
                          
                            "
                          
                          
                            key_927
                          
                          
                            "
                          
                          
                            102
                          
                          ) 
                          
                            "
                          
                          
                            key_967
                          
                          
                            "
                          
                          
                            103
                          
                          ) 
                          
                            "
                          
                          
                            key_904
                          
                          
                            "
                          
                          
                            104
                          
                          ) 
                          
                            "
                          
                          
                            key_900
                          
                          
                            "
                          
                          
                            105
                          
                          ) 
                          
                            "
                          
                          
                            key_938
                          
                          
                            "
                          
                          
                            106
                          
                          ) 
                          
                            "
                          
                          
                            key_973
                          
                          
                            "
                          
                          
                            107
                          
                          ) 
                          
                            "
                          
                          
                            key_97
                          
                          
                            "
                          
                          
                            108
                          
                          ) 
                          
                            "
                          
                          
                            key_920
                          
                          
                            "
                          
                          
                            109
                          
                          ) 
                          
                            "
                          
                          
                            key_985
                          
                          
                            "
                          
                          
                            110
                          
                          ) 
                          
                            "
                          
                          
                            key_963
                          
                          
                            "
                          
                          
                            111
                          
                          ) 
                          
                            "
                          
                          
                            key_975
                          
                          
                            "
                          
                          
                            

#展示当前数据库内的所有key

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > keys *
                          
                             
......
 
                          
                          
                            987
                          
                          ) 
                          
                            "
                          
                          
                            key_172
                          
                          
                            "
                          
                          
                            988
                          
                          ) 
                          
                            "
                          
                          
                            key_64
                          
                          
                            "
                          
                          
                            989
                          
                          ) 
                          
                            "
                          
                          
                            key_79
                          
                          
                            "
                          
                          
                            990
                          
                          ) 
                          
                            "
                          
                          
                            key_801
                          
                          
                            "
                          
                          
                            991
                          
                          ) 
                          
                            "
                          
                          
                            key_502
                          
                          
                            "
                          
                          
                            992
                          
                          ) 
                          
                            "
                          
                          
                            key_144
                          
                          
                            "
                          
                          
                            993
                          
                          ) 
                          
                            "
                          
                          
                            key_514
                          
                          
                            "
                          
                          
                            994
                          
                          ) 
                          
                            "
                          
                          
                            key_615
                          
                          
                            "
                          
                          
                            995
                          
                          ) 
                          
                            "
                          
                          
                            key_197
                          
                          
                            "
                          
                          
                            996
                          
                          ) 
                          
                            "
                          
                          
                            key_84
                          
                          
                            "
                          
                          
                            997
                          
                          ) 
                          
                            "
                          
                          
                            key_681
                          
                          
                            "
                          
                          
                            998
                          
                          ) 
                          
                            "
                          
                          
                            key_572
                          
                          
                            "
                          
                          
                            999
                          
                          ) 
                          
                            "
                          
                          
                            key_656
                          
                          
                            "
                          
                          
                            1000
                          
                          ) 
                          
                            "
                          
                          
                            key_805
                          
                          
                            "
                          
                        

  。

 4、BGSAVE

手动触发后台执行save操作 。

                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 

                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             help bgsave

  BGSAVE 
                          
                          -
                          
                            
  summary: Asynchronously save the dataset to disk
  since: 
                          
                          
                            1.0
                          
                          .
                          
                            0
                          
                          
                            
  group: server


                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             bgsave
Background saving started
                          
                        

  。

 5、DBSIZE

返回当前数据库下的所有key数量 。

                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             help dbsize

  DBSIZE 
                          
                          -
                          
                            
  summary: Return the number of keys 
                          
                          
                            in
                          
                          
                             the selected database
  since: 
                          
                          
                            1.0
                          
                          .
                          
                            0
                          
                          
                            
  group: server


                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             dbsize
(integer) 
                          
                          
                            1000
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                          
                            select
                          
                          
                            1
                          
                          
                            
OK

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          [
                          
                            1
                          
                          ]>
                          
                             dbsize
(integer) 
                          
                          
                            0
                          
                        

  。

 6、FLUSHDB

强制清空当前数据库中的所有key,不会影响其他db中的数据, 谨慎使用 。

                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            >
                            
                               help flushdb

  FLUSHDB [ASYNC]
  summary: Remove all keys from the current database
  since: 
                            
                            
                              1.0
                            
                            .
                            
                              0
                            
                            
                              
  group: server



                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              1
                            
                            ]> 
                            
                              info
                            
                            
                               KeySpace
# Keyspace

                               db0:keys 
                            
                            
                              =
                               1000 
                              ,expires=
                               0 
                              ,avg_ttl=
                               0 
                               db1:keys 
                              =
                               4 
                              ,expires=
                               0 
                              ,avg_ttl=
                               0 
                            
                            
                              

#清空db1中的所有键值,不会影响到db0中的数据

                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              1
                            
                            ]>
                            
                               flushdb
OK

                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              1
                            
                            ]> 
                            
                              info
                            
                            
                               KeySpace
# Keyspace

                               db0:keys 
                            
                            
                              =
                               1000 
                              ,expires=
                               0 
                              ,avg_ttl=
                               0 
                            
                            
                              127.0
                            
                            .
                            
                              0.1
                            
                            :
                            
                              6379
                            
                            [
                            
                              1
                            
                            ]> 
                          

  。

 7、FLUSHALL

强制清空当前redis节点上所有数据库中的所有key,即删除当前节点所有数据, 谨慎使用,必要情况建议禁用此命令 。

                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                          
                            info
                          
                          
                             KeySpace
# Keyspace
db0:keys
                          
                          =
                          
                            1000
                          
                          ,expires=
                          
                            0
                          
                          ,avg_ttl=
                          
                            0
                          
                          
                            
db1:keys
                          
                          =
                          
                            4
                          
                          ,expires=
                          
                            0
                          
                          ,avg_ttl=
                          
                            0
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             flushall
OK

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                          
                            info
                          
                          
                             KeySpace
# Keyspace

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                        

   。

 8、SHUTDOWN

时间复杂度:O(N) N为需要保存的数据库键数量 。

SHUTDOWN执行过程:

  • 停止所有客户端连接
  • 如果至少有一个保存节点在等待,执行SAVE操作
  • 如果AOF开启,更新AOF内容
  • 关闭 Redis Server 

如果开启了持久化配置,SHUTDOWN命令可以保障服务器正常关闭而数据不丢失 。

如果单纯执行SAVE之后,执行 QUIT 命令,则无法保证数据不丢失,SAVE执行完成后,执行 QUIT 命令的过程中,服务器可能依旧存在与客户端的访问连接,会造成这期间数据的丢失.

                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             help shutdown

  SHUTDOWN [NOSAVE
                          
                          |
                          
                            SAVE]
  summary: Synchronously save the dataset to disk and 
                          
                          
                            then
                          
                          
                             shut down the server
  since: 
                          
                          
                            1.0
                          
                          .
                          
                            0
                          
                          
                            
  group: server


                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             shutdown
not connected
                          
                          >
                          
                             
not connected
                          
                          >
                          
                             
not connected
                          
                          >
                          
                             exit

[root@Client
                          
                          -Ubuntu-
                          
                            1804
                          
                          -
                          
                            250
                          
                          :~]# 
                          
                            ps
                          
                           -aux | 
                          
                            grep
                          
                           redis | 
                          
                            grep
                          
                           ^
                          
                            grep
                          
                          
                            
[root@Client
                          
                          -Ubuntu-
                          
                            1804
                          
                          -
                          
                            250
                          
                          :~]# ss -
                          
                            ntlp
State      Recv
                          
                          -Q      Send-
                          
                            Q             Local Address:Port             Peer Address:Port                                                      
LISTEN     
                          
                          
                            0
                          
                          
                            128
                          
                          
                            127.0
                          
                          .
                          
                            0.53
                          
                          %lo:
                          
                            53
                          
                          
                            0.0
                          
                          .
                          
                            0.0
                          
                          :*          users:((
                          
                            "
                          
                          
                            systemd-resolve
                          
                          
                            "
                          
                          ,pid=
                          
                            867
                          
                          ,fd=
                          
                            13
                          
                          
                            ))      
LISTEN     
                          
                          
                            0
                          
                          
                            128
                          
                          
                            0.0
                          
                          .
                          
                            0.0
                          
                          :
                          
                            22
                          
                          
                            0.0
                          
                          .
                          
                            0.0
                          
                          :*          users:((
                          
                            "
                          
                          
                            sshd
                          
                          
                            "
                          
                          ,pid=
                          
                            978
                          
                          ,fd=
                          
                            3
                          
                          
                            ))                  
LISTEN     
                          
                          
                            0
                          
                          
                            128
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6010
                          
                          
                            0.0
                          
                          .
                          
                            0.0
                          
                          :*          users:((
                          
                            "
                          
                          
                            sshd
                          
                          
                            "
                          
                          ,pid=
                          
                            1661
                          
                          ,fd=
                          
                            10
                          
                          
                            ))                
LISTEN     
                          
                          
                            0
                          
                          
                            128
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6011
                          
                          
                            0.0
                          
                          .
                          
                            0.0
                          
                          :*          users:((
                          
                            "
                          
                          
                            sshd
                          
                          
                            "
                          
                          ,pid=
                          
                            1661
                          
                          ,fd=
                          
                            15
                          
                          
                            ))                
LISTEN     
                          
                          
                            0
                          
                          
                            128
                          
                                                   [::]:
                          
                            22
                          
                                                 [::]:*          users:((
                          
                            "
                          
                          
                            sshd
                          
                          
                            "
                          
                          ,pid=
                          
                            978
                          
                          ,fd=
                          
                            4
                          
                          
                            ))                  
LISTEN     
                          
                          
                            0
                          
                          
                            128
                          
                                                  [::
                          
                            1
                          
                          ]:
                          
                            6010
                          
                                               [::]:*          users:((
                          
                            "
                          
                          
                            sshd
                          
                          
                            "
                          
                          ,pid=
                          
                            1661
                          
                          ,fd=
                          
                            9
                          
                          
                            ))                 
LISTEN     
                          
                          
                            0
                          
                          
                            128
                          
                                                  [::
                          
                            1
                          
                          ]:
                          
                            6011
                          
                                               [::]:*          users:((
                          
                            "
                          
                          
                            sshd
                          
                          
                            "
                          
                          ,pid=
                          
                            1661
                          
                          ,fd=
                          
                            12
                          
                          )) 
                        

  。

禁用Redis命令(rename配置)

可通过配置文件中的 rename-comand <command> "" 对原有命令进行重命名 (通常用于对高危命令进行管控) 。

  。

                            
                               #在启用aof情况下,禁用或重命名命令可能会导致redis服务无法启动,是因为实例在之前执行被重命名的命令,导致加载aof时,命令执行失败 
                              
6682
:C 07 May 2023 23 : 20 : 57.411 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo 6682 :C 07 May 2023 23 : 20 : 57.411 # Redis version= 5.0 . 14 , bits= 64 , commit= 00000000 , modified= 0 , pid= 6682 , just started 6682 :C 07 May 2023 23 : 20 : 57.411 # Configuration loaded 6682 :C 07 May 2023 23 : 20 : 57.411 * supervised by systemd, will signal readiness 6682 :M 07 May 2023 23 : 20 : 57.417 * Running mode=standalone, port= 6379 . 6682 :M 07 May 2023 23 : 20 : 57.419 # Server initialized 6682:M 07 May 2023 23:20:57.420 # Unknown command 'flushdb' reading the append only file

  。

解决方案:

1、禁用aof选项 。

2、修改配置重启服务之前,执行 bgrewriteaof 重新生成aof内容 。

  。

                          
                            # Command renaming.
#
# It is possible to change the name of dangerous commands 
                          
                          
                            in
                          
                          
                             a shared
# environment. For instance the CONFIG command may be renamed into something
# hard to guess so that it will still be available 
                          
                          
                            for
                          
                           internal-
                          
                            use tools
# but not available 
                          
                          
                            for
                          
                          
                             general clients.
#
# Example:
#
# rename
                          
                          -
                          
                            command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
#
# It is also possible to completely 
                          
                          
                            kill
                          
                          
                             a command by renaming it into
# an empty 
                          
                          
                            string
                          
                          
                            :
#
# rename
                          
                          -command CONFIG 
                          
                            ""
                          
                          
                            
#
# Please note that changing the name of commands that are logged into the
# AOF 
                          
                          
                            file
                          
                          
                             or transmitted to replicas may cause problems.

                          
                          
                            
renmae
                          
                          -comand FLUSHALL 
                          
                            ""
                          
                          
                            
rename
                          
                          -comand FULSHDB 
                          
                            "
                          
                          
                            REMOVE-THIS-DATABASE
                          
                          
                            "
                          
                        
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                          
                            info
                          
                          
                             keySpace
# Keyspace

                             db0:keys 
                          
                          
                            =
                             1000 
                            ,expires=
                             0 
                            ,avg_ttl=
                             0 
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             flushall
(error) ERR unknown command `flushall`, with args beginning with: 

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          >
                          
                             flushdb
(error) ERR unknown command `flushdb`, with args beginning with: 

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                          
                            info
                          
                          
                             keySpace
# Keyspace

                             db0:keys 
                          
                          
                            =
                             1000 
                            ,expires=
                             0 
                            ,avg_ttl=
                             0 
                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 

                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > REMOVE-THIS-
                          
                            DATABASE
OK

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                          
                            info
                          
                          
                             keySpace
# Keyspace

                          
                          
                            127.0
                          
                          .
                          
                            0.1
                          
                          :
                          
                            6379
                          
                          > 
                        

  。

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