更新密钥

rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2023

安装Mysql8.x版本 yum库

rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-2.noarch.rpm

yum安装Mysql

yum -y install mysql-community-server

启动mysql

systemctl start mysqld

开机自启mysqld

systemctl enable mysqld

检查mysqld运行状态

systemctl status mysqld

遇到错误1：

Failed to start mysqld.service: Unit not found.

解决方法：yum -y install mariadb mariadb-devel mariadb-server

遇到错误2：

Failing package is: mysql-community-libs-8.0.37-1.el7.x86_64，GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

解决方法：

1. 更新gpg秘钥。rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2023
2. 在/etc/yum.repos.d路径下找到mysql-community.repo文件，将gpgcheck=1全部改成gpgcheck=0

遇到错误3

No package mysql-server available.

解决方法：
更新mysql的rpm源

wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
rpm -Uvh mysql80-community-release-el7-3.noarch.rpm