image.png

$  mysql -h  127.0.0.1  -u root  -P3306  -p'XXX'

Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 792625
Server version: 5.6.41-log MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

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

mysql>
mysql> exit

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mysql -h  localhost   -u root  -P3306  -p'XXX'

Warning: Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

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通过 localhost登录会走 mysql.sock ,默认会去找 /tmp/mysql.sock。
如果mysql.sock 不在 /tmp 目录下，需要 通过 -S 或者 --socket 指定。

mysql -h  localhost      -S   /path/to/mysql.sock    -u root  -P3306  -p'XXX'    
mysql -h  localhost      --socket=/path/to/mysql.sock    -u root  -P3306  -p'XXX'    

参考

【MySQL】关于 mysql.sock
https://www.jianshu.com/p/e40fada1cb73

【MySQL】MySQL 建库授权语句
https://www.jianshu.com/p/2237a9649cee

【MySQL】MySQL客户端连接用 localhost和127.0.0.1的区别
https://www.jianshu.com/p/1a5b366a5005