MySQL启动错误总结

centos7中出现mysql启动失败排查方法:首先找到/var/log/mysqd.log

    第一种启动失败:

            查看包含最后几行包含error的行;

    [ERROR] Unix socket lock file is empty /tmp/mysql.sock.lock.
    [ERROR] Unable to setup unix socket lock file.
    [ERROR] Aborting
    解决方法:

            删除该文件rm -rf /tmp/mysql.sock.lock
            启动:systemctl start mysqld 。即可启动成功。

   
第二种启动失败:
    [ERROR] InnoDB: Ignoring the redo log due to missing MLOG_CHECKPOINT between the checkpoint 41054650 and the end 41056501.
    [ERROR] InnoDB: Plugin initialization aborted with error Generic error.
    [ERROR] Plugin 'InnoDB' init function returned error.
    [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
    [ERROR] Failed to initialize plugins.
    [ERROR] Aborting

    失败原因:因为ib_logfile文件中记录些innodb引擎非常有用的信息比如说默认的innodb默认的配置信息,在未正常关闭server情况下,重启后的server不支持innodb引擎。

    解决方法:

        找到mysql的安装目录,比如:cd /usr/local/mysql/data;
        删除ib_logfile文件:rm -f ib_logfile*
        启动:systemctl start mysqld

    第三种启动失败:

    这种没有/var/log/mysqd.log,只有看启动状态。

[root@kedacom kedacom]# systemctl status mysqld
    ● mysqld.service - mysqld
       Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
       Active: failed (Result: exit-code) since 五 2010-12-10 20:43:54 CST; 32min ago
      Process: 26272 ExecStart=/usr/local/mysql/support-files/mysql.server start (code=exited, status=1/FAILURE)
    12月 10 20:43:52 kedacom systemd[1]: Starting mysqld...
    12月 10 20:43:54 kedacom mysql.server[26272]: Starting MySQL.. ERROR! The server quit without updating PID file (/var/run/mysqld/mysqld.pid).
    12月 10 20:43:54 kedacom systemd[1]: mysqld.service: control process exited, code=exited status=1
    12月 10 20:43:54 kedacom systemd[1]: Failed to start mysqld.
    12月 10 20:43:54 kedacom systemd[1]: Unit mysqld.service entered failed state.
    12月 10 20:43:54 kedacom systemd[1]: mysqld.service failed.
    失败原因:

        缺少/var/run/mysqld

    解决方法:

        创建目录,并附权限。mkdir /var/run/mysqld;chown -R mysql:mysql /var/run/mysqld/

    另类错误:

    ERROR 1370 (42000) at line 1974: execute command denied to user 'joeuser'@'%' for routine 'joe.ARCHIVE_ROUND'

    执行 mysql -uroot -pJoe mysql登录后,执行show grants for ‘joeuser’
 

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