mysql在CentOS7.0服务启动失败的解决办法

刺骨的言语ヽ痛彻心扉 2022-10-02 03:54 194阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

中午公司网络问题（当时不知道网络问题），连不上SSH，就在阿里云的控制面板强制重启了服务器，结果Mysql数据库无法启动了，运行mysql 命令直接报错

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'

[root@izx5uaa5mz0yf0z ~]# /etc/init.d/mysqld start
    Starting mysqld (via systemctl):  Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.
                                                               [失败]

通过看日志没看出什么问题

[root@izx5uaa5mz0yf0z ~]# systemctl status mysqld.service
    ● mysqld.service - LSB: start and stop MySQL server
       Loaded: loaded (/etc/rc.d/init.d/mysqld; bad; vendor preset: disabled)
       Active: failed (Result: exit-code) since 一 2018-01-22 21:44:36 CST; 51s ago
         Docs: man:systemd-sysv-generator(8)
      Process: 7214 ExecStart=/etc/rc.d/init.d/mysqld start (code=exited, status=1/FAILURE)
    
    1月 22 21:44:34 izx5uaa5mz0yf0z systemd[1]: Starting LSB: start and stop My....
    1月 22 21:44:36 izx5uaa5mz0yf0z mysqld[7214]: MySQL Daemon failed to start.
    1月 22 21:44:36 izx5uaa5mz0yf0z mysqld[7214]: Starting mysqld:  [FAILED]
    1月 22 21:44:36 izx5uaa5mz0yf0z systemd[1]: mysqld.service: control process...1
    1月 22 21:44:36 izx5uaa5mz0yf0z systemd[1]: Failed to start LSB: start and ....
    1月 22 21:44:36 izx5uaa5mz0yf0z systemd[1]: Unit mysqld.service entered fai....
    1月 22 21:44:36 izx5uaa5mz0yf0z systemd[1]: mysqld.service failed.
    Hint: Some lines were ellipsized, use -l to show in full.
    [root@izx5uaa5mz0yf0z ~]# journalctl -xe 
    -- 
    -- The start-up result is done.
    1月 22 21:44:34 izx5uaa5mz0yf0z polkitd[488]: Registered Authentication Agent fo
    1月 22 21:44:34 izx5uaa5mz0yf0z systemd[1]: Starting LSB: start and stop MySQL s
    -- Subject: Unit mysqld.service has begun start-up
    -- Defined-By: systemd
    -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
    -- 
    -- Unit mysqld.service has begun starting up.
    1月 22 21:44:36 izx5uaa5mz0yf0z mysqld[7214]: MySQL Daemon failed to start.
    1月 22 21:44:36 izx5uaa5mz0yf0z mysqld[7214]: Starting mysqld:  [FAILED]
    1月 22 21:44:36 izx5uaa5mz0yf0z systemd[1]: mysqld.service: control process exit
    1月 22 21:44:36 izx5uaa5mz0yf0z systemd[1]: Failed to start LSB: start and stop 
    -- Subject: Unit mysqld.service has failed
    -- Defined-By: systemd
    -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
    -- 
    -- Unit mysqld.service has failed.
    -- 
    -- The result is failed.
    1月 22 21:44:36 izx5uaa5mz0yf0z systemd[1]: Unit mysqld.service entered failed s
    1月 22 21:44:36 izx5uaa5mz0yf0z systemd[1]: mysqld.service failed.
    1月 22 21:44:36 izx5uaa5mz0yf0z polkitd[488]: Unregistered Authentication Agent

百度上的资料也都是千篇一律，也都没有用

最后查看mysql服务的启动日志，发现mysql服务启动的时候不能创建PID文件。

最后通过以下命令成功启动了mysql

[root@izx5uaa5mz0yf0z ~]# ls -ld /var/run/mysqld/
    drwxr-xr-x 2 mysql mysql 60 1月  22 21:48 /var/run/mysqld/
    [root@izx5uaa5mz0yf0z ~]# mkdir -p /var/run/mysqld
    [root@izx5uaa5mz0yf0z ~]# ls -ld /var/run/mysqld/
    drwxr-xr-x 2 mysql mysql 60 1月  22 21:48 /var/run/mysqld/
    [root@izx5uaa5mz0yf0z ~]# chown mysql.mysql /var/run/mysqld/
    [root@izx5uaa5mz0yf0z ~]# /etc/init.d/mysqld start
    Starting mysqld (via systemctl):                           [  确定  ]

最后劝下大家最好不要通过控制台去强制重启云服务器，血淋淋的教训啊

转载于:https://my.oschina.net/zchuanzhao/blog/1611435

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220113/f59aea53fa31457297211dca8879247b.png