1、添加MySQL的yum仓库

下载地址：

下载后，执行如下命令：

shell> sudo rpm -Uvh mysql80-community-release-el6-n.noarch.rpm

2、安装mysql

shell> sudo yum install mysql-community-server

3、启动mysql

启动mysql

shell> sudo systemctl start mysqld.service

查看mysql状态

shell> sudo systemctl status mysqld.service

4、查询root密码

shell> sudo grep 'temporary password' /var/log/mysqld.log

登陆，重新设置密码

shell> mysql -uroot -pmysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

5、密码错误

如果报错，密码不符合当前设置的强度规则

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

执行如下命令，查看密码规则

mysql> SHOW VARIABLES LIKE 'validate_password%';  +--------------------------------------+--------+| Variable_name                        | Value  |+--------------------------------------+--------+| validate_password.check_user_name    | ON     || validate_password.dictionary_file    |        || validate_password.length             | 8      || validate_password.mixed_case_count   | 1      || validate_password.number_count       | 1      || validate_password.policy             | MEDIUM || validate_password.special_char_count | 1      |+--------------------------------------+--------+7 rows in set (0.01 sec)

参数解释：

validate_password_dictionary_file

插件用于验证密码强度的字典文件路径。

validate_password_length

密码最小长度，参数默认为8，它有最小值的限制，最小值为：validate_password_number_count + validate_password_special_char_count + (2 * validate_password_mixed_case_count)

validate_password_mixed_case_count

密码至少要包含的小写字母个数和大写字母个数。

validate_password_number_count

密码至少要包含的数字个数。

validate_password_policy

密码强度检查等级，0/LOW、1/MEDIUM、2/STRONG。有以下取值：

Policy	Tests Performed
`0` or `LOW`	Length
`1` or `MEDIUM`	Length; numeric, lowercase/uppercase, and special characters
`2` or `STRONG`	Length; numeric, lowercase/uppercase, and special characters; dictionary file