linux下mysql启动 Starting MySQL. ERROR! The server quit without updating PID file（xxx/x.pid）

service mysql start

报错：

Starting MySQL. ERROR! The server quit without updating PID file（xxx/x.pid）

查看日志：

[ERROR] Could not create unix socket lock file /usr/local/mysql/sock/mysql.sock.lock.
2018-11-30T03:01:12.764913Z 0 [ERROR] Unable to setup unix socket lock file.
2018-11-30T03:01:12.764928Z 0 [ERROR] Aborting

原因：

mysql用户没有/usr/local/mysql/sock/权限

解决办法：

chown -R mysql.mysql /usr/local/mysql/sock/