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

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

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

换成

[root@XXX ~]# mysql -h 127.0.0.1 -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.7.-log Source distribution

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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

原因:MySQL设置成了值允许 127.0.0.1 地址访问