1、rpm安装
 wget https://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
 
 rpm -ivh mysql57-community-release-el7-9.noarch.rpm
 
 yum install mysql-community-server
 
安装如下：
 mysql-community-libs                           x86_64                    5.7.17-1.el7                     mysql57-community                    2.1 M
 mysql-community-libs-compat                    x86_64                    5.7.17-1.el7                     mysql57-community                    2.0 M
 mysql-community-server                         x86_64                    5.7.17-1.el7                     mysql57-community                    162 M
 mysql-community-client                         x86_64                    5.7.17-1.el7                     mysql57-community                     24 M
 mysql-community-common                         x86_64                    5.7.17-1.el7                     mysql57-community                    271 k

2、systemctl启动mysql
systemctl start mysqld
systemctl status mysqld

3、systemctl设置开机启动
systemctl enable mysqld
systemctl daemon-reload

3、修改mysql root密码
grep 'temporary password' /var/log/mysqld.log

ALTER USER 'root'@'localhost' IDENTIFIED BY 'mypasswd';

创建新用户并授权
CREATE USER 'myusername'@'%' IDENTIFIED BY 'mypasswd';


配置文件：/etc/my.cnf  
日志文件：/var/log/mysqld.log  
服务启动脚本：/usr/lib/systemd/system/mysqld.service  
socket文件：/var/run/mysqld/mysqld.pid

主从:
Master:
flush tables with read lock;
show master status;
unlock tables;

stop slave;
change master to master_host='172.21.250.165',master_user='buyao',master_password='buyao#!#303132MYSQLbuyao',master_log_file='binlog.000004',master_log_pos=1947;
show slave status;
start slave;