#yum安装mysql5.7
#wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
#yum -y install mysql57-community-release-el7-10.noarch.rpm
#yum -y install mysql-community-server
#grep "password" /var/log/mysqld.log
#mysql -uroot -p''
#mysql>SET GLOBAL validate_password_policy=LOW;
#mysql>ALTER USER 'root'@'localhost' IDENTIFIED BY '12345678';
