ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’

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故障描述：启动mysql 报错：
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

1.先查看mysql启动状态

#/etc/rc.d/init.d/mysqld status

2.mysql.sock位置查找与验证？

# find / -name mysql.sock
/Data/mydata/mysql.sock

验证目录是否正确

   #mysql -u root -p -S /Data/mydata/mysql.sock

备注：-S参数socket file文件验证

3.验证mysql.sock文件权限和用户是否正确？
如果是权限问题，则先改变权限

#chown -R mysql:mysql /Data/mydata/mysql.sock
[root@localhost ~]# /etc/init.d/mysqld start
启动 MySQL： [ OK]

4.永久解决修改/etc/my.cnf添加以下内容到/etc/my.conf:

[client]
socket = /Data/mydata/mysql.sock
[mysqld]
socket = /Data/mydata/mysql.sock