wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
yum localinstall mysql57-community-release-el7-8.noarch.rpm
# yum repolist enabled | grep "mysql.*-community.*"

systemctl enable mysqld
systemctl daemon-reload

grep 'temporary password' /var/log/mysqld.log
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mysql -u root -p
set global validate_password_policy=0;
set global validate_password_length=1;
ALTER USER 'root'@'localhost' IDENTIFIED BY 'admin';

CREATE USER 'admin'@'%' IDENTIFIED BY 'admin';
GRANT ALL ON *.* TO 'admin'@'%';
flush privileges