CentOS7安装MySQL初始密码设置：ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password:

晕，找了好半天终于找到了，在这里做个笔记。

解决错误：ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

Table of Contents

1.安装

2.查找初始密码

3.密码修改

4.其他设置

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感谢：CentOs安装Mysql和配置初始密码

1.安装

首先使用yum安装MySQL就不用过多说明了。

2.查找初始密码

查找方式：

$ grep 'temporary pass' /var/log/mysqld.log 
2018-02-04T06:08:19.158928Z 1 [Note] A temporary password is generated for root@localhost: l#()FqWfy9ih

这里注意，我的密码里带有()括号，那么这样用就不对了

$ mysql -uroot -pl#()FqWfy9ih
bash: 未预期的符号 `(' 附近有语法错误

需要这样用：

$ mysql -uroot -pl#\(\)FqWfy9ih
mysql: [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 31
Server version: 5.7.24

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> 

成功进入MySQL的命令行。

3.密码修改

mysql> set password for 'root'@'localhost' = password('root');
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> set global validate_password_length=0;
Query OK, 0 rows affected (0.00 sec)

mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)

mysql>  set password for 'root'@'localhost' = password('root ');
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> exit
Bye
$ 

以上命令依次为：

1. 修改：密码最小长度策略
2. 修改：密码强度检查等级策略，0/LOW、1/MEDIUM、2/STRONG
3. 修改密码

4.其他设置

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root ' WITH GRANT OPTION;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

依次为：

1. 开启mysql的root用户远程连接服务(%号即远程连接，IDENTIFIED BY后面跟的密码)
2. 刷新