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为什么配置skip-name-resolve？

由于mysql -h${ip} 远程访问速度过慢，

mysql -h172.16.66.171 -uroot -p123456

 根据网友经验（https://www.cnblogs.com/yjf512/p/3803762.html），

vi /etc/my.cnf

[mysqld]
skip-name-resolve

重启mysql,发现远程访问msyql速度上来了，解决问题。

 然而引发了新的问题：

但是却发现msyql（mysql -h127.0.0.1 -uroot -p123456）无法本地访问：

[root@localhost ~]#  mysql -h127.0.0.1 -uroot -p123456
Warning: Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)

而不输入密码（mysql -h127.0.0.1 -uroot）却可以访问。

[root@localhost ~]#   mysql -h127.0.0.1 -uroot 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 91114
Server version: 5.6.35-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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>

 

解决方法：

参考（http://blog.sina.com.cn/s/blog_759a5a7c01017dj0.html），重置root密码：

[root@localhost ~]#   mysql -h127.0.0.1 -uroot 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 91114
Server version: 5.6.35-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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> use mysql;
Database changed
mysql> update user set password=password("123456") where user="root";
Query OK, 3 rows affected (0.06 sec)
Rows matched: 5  Changed: 3  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.13 sec)

mysql> quit
Bye

[root@localhost ~]# 

 用 mysql -h127.0.0.1 -uroot -p123456 访问，问题解决。

[root@localhost ~]# mysql -h127.0.0.1 -uroot -p123456
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 2487
Server version: 5.6.35-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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>

 由于开启skip-name-resolve引发的ERROR 1045 (28000)网上资料不详，解决这个问题花了大半天，所以发布这篇文章。

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