mysql地址：https://dev.mysql.com/downloads/repo/yum/
检测是否安装mysql
rpm -qa | grep mysql
卸载mysql
rpm -e mysql
rpm -e --nodeps mysql
安装
wget https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm
rpm -ivh mysql80-community-release-el7-1.noarch.rpm
yum install mysql-server
systemctl start mysql.service
报错：
Failed to start mysqld.service: Unit not found
首先需要安装mariadb-server
yum install -y mariadb-server
启动服务
systemctl start mariadb.service
添加到开机启动
systemctl enable mariadb.service
mysql_sceure_installation
yum install mysql-server
没有可用软件包 mysql-server
查看mysql端口
netstat -ntlp | grep mysql
关闭mysql
mysqladmin -uroot -p shutdown
原文：https://www.cnblogs.com/jackyzm/p/9318876.html