通过yum方式安装mySql数据库的全过程

 wget http://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm

yum -y install mysql57-community-release-el7-11.noarch.rpm

yum -y install mysql-server  --nogpgcheck
--nogpgcheck  (不校验数字签名)

systemctl start mysqld.service
systemctl status mysql.service

cat /var/log/mysqld.log| grep password

ALTER USER USER() IDENTIFIED BY '123456Admin@123';

grant all privileges on *.* to 'root'@'%' identified by '123456Admin@123' with grant option;

flush privileges;
(立即刷新配置)

set global validate_password_policy=0;
set global validate_password_length=1;

flush privileges;

alter user 'root'@'localhost' identified by 'root';

grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option;