CentOS 7下安装MySQL

首先下载rpm，比如mysql57-community-release-el7-9.noarch.rpm

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

然后

sudo rpm -ivh mysql57-community-release-el7-9.noarch.rpm 
sudo yum install mysql-server

之后我们要查看安装MySQL时随机生成的临时密码，同时

grep "password" /var/log/mysqld.log
sudo chown -R root:root /var/lib/mysql

然后我们就可以用查到的临时密码登录了。

mysql -u root -p

修改密码

set global validate_password_policy=0; 
ALTER USER USER() IDENTIFIED BY 'YourPassword';