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【Mysql】Mysql从库每隔一段时间就重启

背景：HuaYun_Interface-SLAVE从库每隔一段时间slave复制进程便停掉，zabbix发送告警短信
  1. MySQL> show slave status\G;
  2. *************************** 1. row ***************************
  3.                Slave_IO_State:
  4.                   Master_Host: *****
  5.                   Master_User: repl
  6.                   Master_Port: 3307
  7.                 Connect_Retry: 60
  8.               Master_Log_File: mysql-bin.000195
  9.           Read_Master_Log_Pos: 629275501
  10.                Relay_Log_File: mysql-relay-bin.000521
  11.                 Relay_Log_Pos: 625430128
  12.         Relay_Master_Log_File: mysql-bin.000195
  13.              Slave_IO_Running: No
  14.             Slave_SQL_Running: No


停掉时查看mysql错误日志我们发现端倪
  1. 2016-06-23 14:06:56 32289 [Warning] 'proxies_priv' entry '@ root@sh275' ignored in --skip-name-resolve mode.
    160623 15:03:49 mysqld_safe Number of processes running now: 0
    160623 15:03:49 mysqld_safe mysqld restarted                 -----发现是mysql服务重启了，而我们配置了skip_slave_start（禁止repl进程自动重启），所以复制进程处于down状态
    2016-06-23 15:03:50 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
    2016-06-23 15:03:50 0 [Note] /home/data/mysql/bin/mysqld (mysqld 5.6.24-log) starting as process 22569 ...
    2016-06-23 15:03:50 22569 [Note] Plugin 'FEDERATED' is disabled.
    2016-06-23 15:03:50 22569 [Note] InnoDB: Using atomics to ref count buffer pool pages
    2016-06-23 15:03:50 22569 [Note] InnoDB: The InnoDB memory heap is disabled
    2016-06-23 15:03:50 22569 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
    2016-06-23 15:03:50 22569 [Note] InnoDB: Memory barrier is not used
    2016-06-23 15:03:50 22569 [Note] InnoDB: Compressed tables use zlib 1.2.3
    2016-06-23 15:03:50 22569 [Note] InnoDB: Using Linux native AIO
    2016-06-23 15:03:50 22569 [Note] InnoDB: Not using CPU crc32 instructions
    2016-06-23 15:03:50 22569 [Note] InnoDB: Initializing buffer pool, size = 10.0G
    2016-06-23 15:03:51 22569 [Note] InnoDB: Completed initialization of buffer pool


同时我们查看zabbix发送的邮件，有linux主机内存报警通知
  1. 告警主机：_HuaYun_Interface-SLAVE
  2. 主机IP： ******
  3. 告警时间：2016.06.23 15:08:06
  4. 告警等级：Average
  5. 告警信息：Lack of available memory on server HuaYun_Interface-SLAVE
  6. 问题详情：Available memory:163.15 MB
  7. 事件ID： 42590

登上主机检查
  1. [root@NEW-APP-MYSQL-SLAVE ~]# dmesg 
  2. Out of memory: Kill process 32289 (mysqld) score 966 or sacrifice child
  3. Killed process 32289, UID 498, (mysqld) total-vm:14630648kB, anon-rss:7711284kB, file-rss:360kB
[root@NEW-APP-MYSQL-SLAVE ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          7872       7747        124          0        124       1331
-/+ buffers/cache:       6292       1580
Swap:         2047         56       1991




很明显是linux内存不足而发生了OOM killer现象，没办法，加大主机内存吧




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