rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm

yum clean all

yum repolist

systemctl start mysqld

systemctl enable mysqld

#mysql_secure_installation

Set root password"htmlcode">

mysql -V

mysql Ver 14.14 Distrib 5.6.39, for Linux (x86_64) using EditLine wrapper




七，验证：(无密码)
mysql -uroot -p 密码
八、设置密码和远程权限
数据库密码设置：#set password for 'root'@'localhost'=password('userpasswd');
九、配置防火墙
  firewall-cmd --zone=public --add-port=3306/tcp --permanent