安装环境：CentOS7 64位 ，安装MySQL5.7
1、配置YUM源
在MySQL官网中下载YUM源rpm安装包：https://dev.mysql.com/downloads/repo/yum/
wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
安装mysql源
yum localinstall mysql57-community-release-el7-8.noarch.rpm
检查mysql源是否安装成功
yum repolist enabled | grep "mysql.*-community.*"
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2、安装MySQL
yum install mysql-community-server
3、启动MySQL服务
systemctl start mysqld
4、开机启动
systemctl enable mysqld
systemctl daemon-reload
5、修改root本地登录密码
mysql安装完成之后，在/var/log/mysqld.log文件中给root生成了一个默认密码。通过下面的方式找到root默认密码，然后登录mysql进行修改：
set password for 'root'@'localhost'=password('password!');
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6、允许远程连接
create user '用户名'@'%' identified by '密码';
grant all privileges on 数据库.* to '用户名'@'%' with grant option;
flush privileges;
