1，使用rpm -qa | grep mysql命令，检查系统是否已经安装了mysql，如果已经安装mysql，需要先卸载。
2，添加在线mysql源
vim /etc/yum.repos.d/mysql.repo
将下面的内容添加到mysql源
# Enable to use MySQL 8.0
[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/8/x86_64/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
3，安装mysql
yum module disable mysql
yum update
yum install -y mysql-community-common mysql-community-libs mysql-community-client mysql-community-server mysql-community-devel
4，启动mysql服务 (停止mysql服务的命令是：systemctl stop mysqld.service)
systemctl start mysqld.service
5，查看mysql状态
systemctl status mysqld.service
6，将mysql设置为开机自启
systemctl enable mysqld.service
7，登录mysql的时候需要设置密码：首先生成随机密码
grep 'temporary password' /var/log/mysqld.log
8，登录mysql
mysql -uroot -p
然后输入刚才收成的随机密码
9，接下来我们要修改一下密码
alter user 'root'@'localhost' identified by 'abc@123456';
重新登录
mysql就安装完成了