ERROR! The server quit without updating PID file (/var/lib/mysql/localhost.localdomain.pid).

问题：

[root@localhost ~]# /etc/init.d/mysqld start
Starting MySQL.2020-08-27T10:00:27.661815Z mysqld_safe Directory '/var/lib/mysql' for UNIX socket file don't exists.
 ERROR! The server quit without updating PID file (/var/lib/mysql/localhost.localdomain.pid).

解决方案：

执行以下命令

/usr/local/mysql/bin/mysqld --initialize --user=mysql

[root@localhost ~]# /etc/init.d/mysqld start
Starting MySQL. SUCCESS! 

启动成功！！！