[软件故障] ERROR 2002 (HY000): Can't connect to local MySQL server through socket...的解决

现象：
登录MySQL时，提示

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

停止MySQL时，提示

ERROR! MySQL server PID file could not be found!

启动MySQL时，提示

Starting MySQL. ERROR! The server quit without updating PID file (/www/server/data/localhost.localdomain.pid).
touch: cannot touch `/var/lock/subsys/mysql': No space left on device

重启MySQL时，提示

ERROR! MySQL server PID file could not be found!
Starting MySQL. ERROR! The server quit without updating PID file (/www/server/data/localhost.localdomain.pid).
touch: cannot touch `/var/lock/subsys/mysql': No space left on device

解决：清空临时文件夹中的临时文件

1. rm -rf /tmp/*.*

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或

1. rm -rf /tmp/

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