1，下载mysql源安装包

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

2，安装yum源

yum localinstall mysql57-community-release-el7-11.noarch.rpm

3，检查yum源是否安装成功

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

5，安装mysql

yum install mysql-community-server

6，启动mysql并查看其状态

systemctl start mysqld

systemctl status mysqld

7，设置mysql为系统服务，随系统启动而启动

systemctl enable mysqld
systemctl daemon-reload

8，查看mysql下root账号的默认密码

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

9，默认配置文件路径

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

11，进入mysql

mysql -u root -p

然后输入刚查看的密码

12，修改密码策略

mysql的密码策略分为三种：

0或LOW：Length

1或MEDIUM：Length; numeric, lowercase/uppercase, and special characters

2或STRONG：Length; numeric, lowercase/uppercase, and special characters; dictionary file

set global validate_password_policy=0;

13，修改密码

ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

14，添加远程账号

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;

15，常用命令

service mysqld restart/start/stop