Cenos7默认数据库是mariaDB，所以yum install mysql 会自动安装mariaDB。所以我们要想在centos7下安装mysql，首先要配置mysql的源。

1. 从mysql官网下载 yum repo配置文件

wget http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm

2. 安装yum repo 文件

rpm -ivh mysql57-community-release-el7-9.noarch.rpm

这时，mysql的yum源已经安装好了。

3. 清理缓存并更新yum源

yum clean all
yum makecache

4. 安装mysql

yum install mysql-community-server

5. 启动mysql

service mysqld start

6. 查看初始密码

grep 'temporary password' /var/log/mysqld.log

7.使用初始密码登录

mysql -u root -p //回车，然后输入上一步查到的初始密码

8.更改初始密码

ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

修改密码强度限制：https://www.cnblogs.com/ivictor/p/5142809.html

9. 添加用户，设置权限

a.创建用户命令

MariaDB [(none)]> create user inspur@localhost identified by 'inspur';

b. 授权

grant all privileges on *.* to inspur@'localhost' identified by 'inspur';

b.授予外网登录权限

grant all privileges on *.* to root@'%' identified by 'inspur';