在centos7中安装MySQL5.7

1.下载mysql源安装包

wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

2.安装mysql源

yum localinstall mysql57-community-release-el7-8.noarch.rpm

3.检查mysql源是否安装成功

yum repolist enabled | grep "mysql.-community."

4.安装MySQL

yum install mysql-community-server

5.启动MySQL服务

systemctl start mysqld

6.设置开机启动

systemctl enable mysqld

systemctl daemon-reload

7.修改root本地登录密码

查看临时密码

grep 'temporary password' /var/log/mysqld.log

登陆数据库（使用上面的临时密码）

mysql -uroot-p

修改密码

ALTER USER 'root'@'localhost' IDENTIFIED BY'new password';

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这样就完成了MySQL在centos下的安装