启动MySQL报错：
[root@localhost log]# service mysql start
Starting MySQL...The server quit without updating PID file [FAILED]/data/localhost.localdomain.pid).
查看error.log:
log-error=/var/log/error.log
忽略warning，看error
2020-12-11T14:15:20.074345Z 0 [ERROR] Unix socket lock file is empty /tmp/mysql.sock.lock.
2020-12-11T14:15:20.074362Z 0 [ERROR] Unable to setup unix socket lock file.
2020-12-11T14:15:20.074377Z 0 [ERROR] Aborting
解决办法：
进入/tmp/查看mysql.sock.lock，文件大小为0，直接删除该文件rm -rf mysql.sock.lock再启动mysql：service mysql start。即可启动成功。
[root@localhost log]# service mysql start
Starting MySQL. [ OK ]
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