一、准备mysql镜像源

到官网找mysql的yum源

wget https://repo.mysql.com/mysql80-community-release-el7-3.noarch.rpm
rpm -ivh mysql80-community-release-el7-3.noarch.rpm
yum repolist all | grep mysql 

如图:默认安装的是8.0。使用yum-config-manager --disable mysql80-community取消mysql80-community的安装。然后yum-config-manager --enable mysql57-community开启5.7安装。

二、安装mysql

yum install -y mysql-community-server
yum -y install mysql-devel
rm -rf /var/lib/mysql         如果之前安装过mysql执行
rm -rf /var/log/mysql.log     如果之前安装过mysql执行
systemctl restart mysqld

三、初始配置

1、修改root密码

grep "temporary password" /var/log/mysqld.log   查看默认密码
mysql -uroot -p
>=5.7.6版本使用,低版本使用SET PASSWORD = PASSWORD(‘root‘);
ALTER USER USER() IDENTIFIED BY ‘Mysql@password.123‘;     密码复杂要和规范，不建议降低密码复杂度策略，使用太简单的密码会报错

2、开启远程连接

grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘Mysql@password.123‘;
flush privileges;

centos7下使用yum安装制定版本mysql