centons7 Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

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mysql出现这样的错误： 

[root@localhost /]# mysql -uroot -p
Enter password: 
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

试下添加上 -h 命令 （带主机名参数）

mysql -uroot -p -h127.0.0.1