redis - Redis `dir` 路径动态变化的原因

Question

我们遇到了 redis 的问题，其中 'dir' Redis 的路径正在设置，恕不另行通知。

导致以下错误(写入redis时)。

MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.

信息我们必须支持这一点。

- Redis 配置文件

看看我们的redis.conf (位于 /etc/redis/redis.conf )提示我们 dir路径值为...

# The working directory.
#
# The DB will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
#
# The Append Only File will also be created inside this directory.
#
# Note that you must specify a directory here, not a file name.
dir /var/lib/redis

- Redis INFO 结果。

{"redis_version"=>"2.8.17", "redis_git_sha1"=>"00000000", "redis_git_dirty"=>"0", "redis_build_id"=>"e2de0295da7f0ee1", "redis_mode"=>"standalone", "os"=>"Linux 3.16.0-4-amd64 x86_64", "arch_bits"=>"64", "multiplexing_api"=>"epoll", "gcc_version"=>"4.9.2", "process_id"=>"6860", "run_id"=>"4ecd0ff19798a88793e7a3ce281f398ba9aa2f5a", "tcp_port"=>"6379", "uptime_in_seconds"=>"99525", "uptime_in_days"=>"1", "hz"=>"10", "lru_clock"=>"11741717", "config_file"=>"/etc/redis/redis.conf", "connected_clients"=>"2", "client_longest_output_list"=>"0", "client_biggest_input_buf"=>"0", "blocked_clients"=>"0", "used_memory"=>"784840", "used_memory_human"=>"766.45K", "used_memory_rss"=>"3624960", "used_memory_peak"=>"784840", "used_memory_peak_human"=>"766.45K", "used_memory_lua"=>"33792", "mem_fragmentation_ratio"=>"4.62", "mem_allocator"=>"jemalloc-3.6.0", "loading"=>"0", "rdb_changes_since_last_save"=>"0", "rdb_bgsave_in_progress"=>"0", "rdb_last_save_time"=>"1454582288", "rdb_last_bgsave_status"=>"ok", "rdb_last_bgsave_time_sec"=>"0", "rdb_current_bgsave_time_sec"=>"-1", "aof_enabled"=>"0", "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", "total_connections_received"=>"12", "total_commands_processed"=>"4651", "instantaneous_ops_per_sec"=>"0", "rejected_connections"=>"0", "sync_full"=>"0", "sync_partial_ok"=>"0", "sync_partial_err"=>"0", "expired_keys"=>"0", "evicted_keys"=>"0", "keyspace_hits"=>"0", "keyspace_misses"=>"0", "pubsub_channels"=>"0", "pubsub_patterns"=>"0", "latest_fork_usec"=>"206", "role"=>"master", "connected_slaves"=>"0", "master_repl_offset"=>"0", "repl_backlog_active"=>"0", "repl_backlog_size"=>"1048576", "repl_backlog_first_byte_offset"=>"0", "repl_backlog_histlen"=>"0", "used_cpu_sys"=>"57.78", "used_cpu_user"=>"25.71", "used_cpu_sys_children"=>"0.00", "used_cpu_user_children"=>"0.00", "db0"=>"keys=2851,expires=0,avg_ttl=0"}

要点

 redis.info['config_file'] 

 => /etc/redis/redis.conf

Redis的进程id

 redis.info['process_id']

 => 6860

- Redis 配置

然后我检查了 redis 配置......

redis.config "get" ,"dir"

=> ["dir", "/etc/ssh"]
## ideally should be /var/lib/redis

事情，我确实修复了上述错误。

redis.config "set" ,"dir","/var/lib/redis"
=> "OK" 

redis.config "get", "dir"
=> ["dir", "/var/lib/redis"]

这样可以修复它(上述问题)。但仅出于临时目的，因为......

几个小时后我注意到了这一点。

redis.config "get" ,"dir"
=> ["dir", "/etc/ssh"]

再次检查redis配置

- Redis 信息

{"redis_version"=>"2.8.17", "redis_git_sha1"=>"00000000", "redis_git_dirty"=>"0", "redis_build_id"=>"e2de0295da7f0ee1", "redis_mode"=>"standalone", "os"=>"Linux 3.16.0-4-amd64 x86_64", "arch_bits"=>"64", "multiplexing_api"=>"epoll", "gcc_version"=>"4.9.2", "process_id"=>"6860", "run_id"=>"4ecd0ff19798a88793e7a3ce281f398ba9aa2f5a", "tcp_port"=>"6379", "uptime_in_seconds"=>"109032", "uptime_in_days"=>"1", "hz"=>"10", "lru_clock"=>"11751224", "config_file"=>"/etc/redis/redis.conf", "connected_clients"=>"2", "client_longest_output_list"=>"0", "client_biggest_input_buf"=>"0", "blocked_clients"=>"0", "used_memory"=>"788984", "used_memory_human"=>"770.49K", "used_memory_rss"=>"3629056", "used_memory_peak"=>"808952", "used_memory_peak_human"=>"789.99K", "used_memory_lua"=>"33792", "mem_fragmentation_ratio"=>"4.60", "mem_allocator"=>"jemalloc-3.6.0", "loading"=>"0", "rdb_changes_since_last_save"=>"82", "rdb_bgsave_in_progress"=>"0", "rdb_last_save_time"=>"1454591521", "rdb_last_bgsave_status"=>"ok", "rdb_last_bgsave_time_sec"=>"0", "rdb_current_bgsave_time_sec"=>"-1", "aof_enabled"=>"0", "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", "total_connections_received"=>"14", "total_commands_processed"=>"6966", "instantaneous_ops_per_sec"=>"0", "rejected_connections"=>"0", "sync_full"=>"0", "sync_partial_ok"=>"0", "sync_partial_err"=>"0", "expired_keys"=>"0", "evicted_keys"=>"0", "keyspace_hits"=>"0", "keyspace_misses"=>"0", "pubsub_channels"=>"0", "pubsub_patterns"=>"0", "latest_fork_usec"=>"135", "role"=>"master", "connected_slaves"=>"0", "master_repl_offset"=>"0", "repl_backlog_active"=>"0", "repl_backlog_size"=>"1048576", "repl_backlog_first_byte_offset"=>"0", "repl_backlog_histlen"=>"0", "used_cpu_sys"=>"62.96", "used_cpu_user"=>"27.97", "used_cpu_sys_children"=>"0.00", "used_cpu_user_children"=>"0.00", "db0"=>"keys=2902,expires=0,avg_ttl=0"}

关键点。

 redis.info["process_id"]
 => 6860

 redis.info['config_file']
 => /etc/redis/redis.conf

所以，

1. Redis 服务器从未重新启动。 (process_id 对此说了很多)。

2. Redis 正在选择正确的配置文件，即 /etc/redis/redis.conf .

问题。

那么，如果第 1 点和第 2 点为真，那么导致 redis 的原因是什么？设置config dir值为 /etc/ssh几个小时后？ (自昨天以来我已重置配置 5-6 次。)

注意:

还重新启动了服务器(昨天)，希望问题能够得到永久解决。但运气不好。

注意:

回应@Keith的回答

是的!服务器完全位于限制性防火墙后面。

想什么？

Answer 1

我最近看到一次利用此作为策略的攻击。您的服务器是否位于限制性防火墙后面？

引用号:http://antirez.com/news/96