MySQL的安装

1、获取官方yum仓库

访问 https://dev.mysql.com/downloads/repo/yum/，获取对应版本地址

wget https://dev.mysql.com/get/mysql80-community-release-el7-9.noarch.rpm

2、安装MySQL官方源

yum localinstall mysql80-community-release-el7-9.noarch.rpm

3、安装MySQL

yum install -y mysql-community-server

4、启动MySQL的服务

systemctl start mysqld.service

查看服务运行状态
systemctl status mysqld.service

5、设置开机自启

systemctl enable mysqld.service

6、查看root临时密码

cat /var/log/mysqld.log

找到如下内容：
A temporary password is generated for root@localhost: 6CR;w?f&)nlS

7、登录MySQL，修改root密码

mysql -u root -p

alter user 'root'@'localhost' IDENTIFIED BY 'your password';

可选内容

设置root允许远程访问

use mysql;
update user set host='%' where user='root';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
flush privileges;//刷新权限