wget http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
yum localinstall mysql57-community-release-el7-8.noarch.rpm
yum install mysql-community-server
grep 'temporary password' /var/log/mysqld.log
CREATE USER 'username'@'host' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'WITH GRANT OPTION
FLUSH PRIVILEGES