1. 卸载mariadb
#查询
rpm -qa|grep mariadb
#卸载
#语句：rpm -e --nodeps 软件名
#实例：
rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64
2. 下载安装mysql
#下载
wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.25-1.el7.x86_64.rpm-bundle.tar
#解压缩
tar -xvf mysql-8.0.25-1.el7.x86_64.rpm-bundle.tar
#安装
rpm -ivh mysql-community-common-8.0.25-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-plugins-8.0.25-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.25-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-8.0.25-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0.25-1.el7.x86_64.rpm
#检查是否成功
rpm -qa|grep -i mysql
#初始化
mysqld --initialize --user=mysql
#查看密码
cat /var/log/mysqld.log
#启动mysql
systemctl start mysqld.service
#查看状态
systemctl status mysqld.service
#登陆
mysql -uroot -p
