mysql - systemctl无法在centos 7上启动mysql

Question

我正在尝试在 centos 7 上启动 mysql。(centos 运行在一个 vagrant box 中，使用 vmware-workstation 作为提供程序)我有一个 Chef 脚本，但尝试使用 Chef Recipe 启动 mysql 失败。

此时我只是尝试通过 ssh 进入盒子并手动启动 mysql，这是我得到的输出:

(cms-env)[GISO@localhost ~]$ sudo systemctl start mysql-cms
Job for mysql-cms.service failed. See 'systemctl status mysql-cms.service' and '
journalctl -xn' for details.


[GISO@localhost ~]$ sudo systemctl -l status mysql-cms.service
mysql-cms.service - mysql_service[mysql-cms]
   Loaded: loaded (/usr/lib/systemd/system/mysql-cms.service; enabled)
   Active: failed (Result: exit-code) since Sun 2015-07-05 18:03:59 EDT; 5h 51mi
n ago
  Process: 11215 ExecStartPost=/usr/libexec/mysql-cms-wait-ready $MAINPID (code=
exited, status=1/FAILURE)
  Process: 11214 ExecStart=/usr/sbin/mysqld --defaults-file=/etc/mysql-cms/my.cn
f --basedir=/usr (code=exited, status=1/FAILURE)
 Main PID: 11214 (code=exited, status=1/FAILURE)
   CGroup: /system.slice/mysql-cms.service

Jul 05 18:03:59 localhost.localdomain systemd[1]: Starting mysql_service[mysql-c
ms]...
Jul 05 18:03:59 localhost.localdomain mysqld[11214]: mysqld: [ERROR] Could not o
pen required defaults file: /etc/mysql-cms/my.cnf
Jul 05 18:03:59 localhost.localdomain mysqld[11214]: mysqld: [ERROR] Fatal error
 in defaults handling. Program aborted!
Jul 05 18:03:59 localhost.localdomain systemd[1]: mysql-cms.service: main proces
s exited, code=exited, status=1/FAILURE
Jul 05 18:03:59 localhost.localdomain systemd[1]: mysql-cms.service: control pro
cess exited, code=exited status=1
Jul 05 18:03:59 localhost.localdomain systemd[1]: Failed to start mysql_service[
mysql-cms].
Jul 05 18:03:59 localhost.localdomain systemd[1]: Unit mysql-cms.service entered
 failed state.

我花了好几个小时一直在努力解决这个问题。已下载所有推荐的开发库等...无法弄清楚是什么原因导致此失败。任何帮助是极大的赞赏!谢谢

编辑:我可以通过sudo journalctl -l | grep mysql在这里挖掘更多日志(对于格式问题我深表歉意)

.
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.612681Z
0 [Note] /usr/sbin/mysqld (mysqld 5.7.7-rc) starting as process 2447 ...
Jul 06 00:43:32 localhost.localdomain mysqld[1639]: 2015-07-06T04:43:32.718655Z
0 [Warning] One can only use the --user switch if running as root
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.740870Z
0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.740950Z
0 [Note] InnoDB: Uses event mutexes
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.740957Z
0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.740961Z
0 [Note] InnoDB: Compressed tables use zlib 1.2.3
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.740989Z
0 [Note] InnoDB: Using Linux native AIO
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.742476Z
0 [Note] InnoDB: Number of pools: 1
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.747596Z
0 [Note] InnoDB: Using CPU crc32 instructions
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.797073Z
0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chu
nk size = 128M
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.935407Z
0 [Note] InnoDB: Completed initialization of buffer pool
Jul 06 00:43:32 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:32.995995Z
0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread
 priority can be changed. See the man page of setpriority().
Jul 06 00:43:33 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:33.309642Z
0 [Note] InnoDB: Highest supported file format is Barracuda.
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.207332Z
0 [Note] InnoDB: Creating shared tablespace for temporary tables
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.207488Z
0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the f
ile full; Please wait ...
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.341340Z
0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.342346Z
0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s)
are active.
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.342359Z
0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.342802Z
0 [Note] InnoDB: Waiting for purge to start
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.398277Z
0 [Note] InnoDB: 5.7.7 started; log sequence number 2529895
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.406371Z
0 [Note] Plugin 'FEDERATED' is disabled.
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.433314Z
0 [Note] InnoDB: Loading buffer pool(s) from .//ib_buffer_pool
Jul 06 00:43:34 localhost.localdomain systemd[1]: mysql-cms.service: main proces
s exited, code=exited, status=1/FAILURE
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.787281Z
0 [Warning] Failed to setup SSL
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.787331Z
0 [Warning] SSL error: SSL context is not usable without certificate and private
 key
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.788123Z
0 [Note] Server hostname (bind-address): '*'; port: 3306
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.788187Z
0 [Note] IPv6 is available.
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.788207Z
0 [Note]   - '::' resolves to '::';
Jul 06 00:43:34 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:34.788220Z
0 [Note] Server socket created on IP: '::'.
Jul 06 00:43:35 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:35.167395Z
0 [Note] InnoDB: Buffer pool(s) load completed at 150706  0:43:35
Jul 06 00:43:35 localhost.localdomain systemd[1]: mysql-cms.service: control pro
cess exited, code=exited status=1
Jul 06 00:43:35 localhost.localdomain systemd[1]: Failed to start mysql_service[
mysql-cms].
Jul 06 00:43:35 localhost.localdomain systemd[1]: Unit mysql-cms.service entered
 failed state.
Jul 06 00:43:35 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:35.590242Z
0 [Note] Event Scheduler: Loaded 0 events
Jul 06 00:43:35 localhost.localdomain mysqld[2184]: 2015-07-06T04:43:35.590343Z
0 [Note] /usr/sbin/mysqld: ready for connections.
Jul 06 00:43:35 localhost.localdomain mysqld[2184]: Version: '5.7.7-rc'  socket:
 '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL)
Jul 06 00:43:35 localhost.localdomain systemd[1]: PID file /var/run/mysqld/mysql
d.pid not readable (yet?) after start.
Jul 06 00:44:15 localhost.localdomain systemd[1]: Starting mysql_service[mysql-c
ms]...
Jul 06 00:44:16 localhost.localdomain mysqld[5225]: 2015-07-06T04:44:16.187336Z
0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --ex
plicit_defaults_for_timestamp server option (see documentation for more details)
.
Jul 06 00:44:16 localhost.localdomain mysqld[5225]: 2015-07-06T04:44:16.191829Z
0 [Note] /usr/sbin/mysqld (mysqld 5.7.7-rc) starting as process 5225 ...
Jul 06 00:44:16 localhost.localdomain mysqld[5225]: 2015-07-06T04:44:16.195418Z
0 [Warning] One can only use the --user switch if running as root
Jul 06 00:44:18 localhost.localdomain systemd[1]: mysql-cms.service: main proces
s exited, code=exited, status=1/FAILURE
Jul 06 00:44:19 localhost.localdomain systemd[1]: mysql-cms.service: control pro
cess exited, code=exited status=1
Jul 06 00:44:19 localhost.localdomain systemd[1]: Failed to start mysql_service[
mysql-cms].
Jul 06 00:44:19 localhost.localdomain systemd[1]: Unit mysql-cms.service entered
 failed state.
Jul 06 00:44:59 localhost.localdomain systemd[1]: mysqld.service operation timed
 out. Terminating.
Jul 06 00:44:59 localhost.localdomain systemd[1]: Unit mysqld.service entered fa
iled state.
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.996641Z
0 [Note] Giving 0 client threads a chance to die gracefully
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.996671Z
0 [Note] Shutting down slave threads
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.996677Z
0 [Note] Forcefully disconnecting 0 remaining clients
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.996685Z
0 [Note] Event Scheduler: Purging the queue. 0 events
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.996806Z
0 [Note] Binlog end
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997418Z
0 [Note] Shutting down plugin 'ngram'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997427Z
0 [Note] Shutting down plugin 'ARCHIVE'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997430Z
0 [Note] Shutting down plugin 'BLACKHOLE'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997438Z
0 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997466Z
0 [Note] Shutting down plugin 'partition'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997469Z
0 [Note] Shutting down plugin 'MRG_MYISAM'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997474Z
0 [Note] Shutting down plugin 'CSV'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997477Z
0 [Note] Shutting down plugin 'MyISAM'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997484Z
0 [Note] Shutting down plugin 'MEMORY'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997489Z
0 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997493Z
0 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997496Z
0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
Jul 06 00:44:59 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997500Z
0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997502Z
0 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997505Z
0 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997507Z
0 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997509Z
0 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997512Z
0 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997515Z
0 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997518Z
0 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997520Z
0 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997523Z
0 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997525Z
0 [Note] Shutting down plugin 'INNODB_FT_DELETED'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997528Z
0 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997530Z
0 [Note] Shutting down plugin 'INNODB_METRICS'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997533Z
0 [Note] Shutting down plugin 'INNODB_TEMP_TABLE_INFO'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997535Z
0 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997537Z
0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997539Z
0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997541Z
0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997544Z
0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997551Z
0 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997554Z
0 [Note] Shutting down plugin 'INNODB_CMPMEM'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997557Z
0 [Note] Shutting down plugin 'INNODB_CMP_RESET'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997559Z
0 [Note] Shutting down plugin 'INNODB_CMP'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997562Z
0 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997565Z
0 [Note] Shutting down plugin 'INNODB_LOCKS'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997567Z
0 [Note] Shutting down plugin 'INNODB_TRX'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997570Z
0 [Note] Shutting down plugin 'InnoDB'
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997628Z
0 [Note] InnoDB: FTS optimize thread exiting.
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:44:59.997751Z
0 [Note] InnoDB: Starting shutdown...
Jul 06 00:45:00 localhost.localdomain systemd[1]: mysqld.service holdoff time ov
er, scheduling restart.
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:45:00.100746Z
0 [Note] InnoDB: Dumping buffer pool(s) to .//ib_buffer_pool
Jul 06 00:45:00 localhost.localdomain mysqld[2184]: 2015-07-06T04:45:00.101118Z
0 [Note] InnoDB: Buffer pool(s) dump completed at 150706  0:45:00
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.323561Z
0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --ex
plicit_defaults_for_timestamp server option (see documentation for more details)
.
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.324161Z
0 [Note] /usr/sbin/mysqld (mysqld 5.7.7-rc) starting as process 5309 ...
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.328538Z
0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.328579Z
0 [Note] InnoDB: Uses event mutexes
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.328586Z
0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.328590Z
0 [Note] InnoDB: Compressed tables use zlib 1.2.3
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.328598Z
0 [Note] InnoDB: Using Linux native AIO
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.328885Z
0 [Note] InnoDB: Number of pools: 1
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.329050Z
0 [Note] InnoDB: Using CPU crc32 instructions
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.330182Z
0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chu
nk size = 128M
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.347015Z
0 [Note] InnoDB: Completed initialization of buffer pool
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.348927Z
0 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.348952Z
0 [Note] InnoDB: Check that you do not already have another mysqld process using
 the same InnoDB data or log files.
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.348960Z
0 [Note] InnoDB: Retrying to lock the first data file
Jul 06 00:45:00 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:00.350842Z
0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread
 priority can be changed. See the man page of setpriority().
Jul 06 00:45:01 localhost.localdomain mysqld[2184]: 2015-07-06T04:45:01.324411Z
0 [Note] InnoDB: Shutdown completed; log sequence number 2530296
Jul 06 00:45:01 localhost.localdomain mysqld[2184]: 2015-07-06T04:45:01.328516Z
0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
Jul 06 00:45:01 localhost.localdomain mysqld[2184]: 2015-07-06T04:45:01.328550Z
0 [Note] Shutting down plugin 'sha256_password'
Jul 06 00:45:01 localhost.localdomain mysqld[2184]: 2015-07-06T04:45:01.328561Z
0 [Note] Shutting down plugin 'mysql_native_password'
Jul 06 00:45:01 localhost.localdomain mysqld[2184]: 2015-07-06T04:45:01.328836Z
0 [Note] Shutting down plugin 'binlog'
Jul 06 00:45:01 localhost.localdomain mysqld[2184]: 2015-07-06T04:45:01.329473Z
0 [Note] /usr/sbin/mysqld: Shutdown complete
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.354531Z
0 [Note] InnoDB: Highest supported file format is Barracuda.
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.370145Z
0 [Note] InnoDB: Creating shared tablespace for temporary tables
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.370338Z
0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the f
ile full; Please wait ...
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.579908Z
0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.581476Z
0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s)
are active.
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.581498Z
0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.582462Z
0 [Note] InnoDB: Waiting for purge to start
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.635692Z
0 [Note] InnoDB: 5.7.7 started; log sequence number 2530296
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.636189Z
0 [Note] Plugin 'FEDERATED' is disabled.
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.639421Z
0 [Warning] Failed to setup SSL
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.639453Z
0 [Warning] SSL error: SSL context is not usable without certificate and private
 key
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.640159Z
0 [Note] Server hostname (bind-address): '*'; port: 3306
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.640231Z
0 [Note] IPv6 is available.
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.640254Z
0 [Note]   - '::' resolves to '::';
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.640269Z
0 [Note] Server socket created on IP: '::'.
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.648606Z
0 [Note] InnoDB: Loading buffer pool(s) from .//ib_buffer_pool
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.650883Z
0 [Note] InnoDB: Buffer pool(s) load completed at 150706  0:45:01
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.673495Z
0 [Note] Event Scheduler: Loaded 0 events
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: 2015-07-06T04:45:01.674091Z
0 [Note] /usr/sbin/mysqld: ready for connections.
Jul 06 00:45:01 localhost.localdomain mysqld[5306]: Version: '5.7.7-rc'  socket:
 '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL)
Jul 06 00:45:01 localhost.localdomain systemd[1]: PID file /var/run/mysqld/mysql
d.pid not readable (yet?) after start.

Answer 1

CentOS 正在将 mysql 转换为 mariadb。在 /usr/lib/systemd/system 下，您应该找到文件 mariadb.service。只需运行

sudo systemctl start mariadb.service

然后mysql命令运行!