MariaDB是MySQL社区开发的分支，也是一个增强型的替代品;
安装MariaDB
yum -y install mariadb-server mariadb mariadb-devel
systemctl start mariadb
systemctl enable mariadb
mysql_secure_installation
firewall-cmd --permanent --add-service mysql
systemctl restart firewalld.service
iptables -L -n|grep 3306
登录数据库查看下是否有变好
msyql -uroot -p
show databases;
#Web服务
firewall-cmd --permanent --add-service http
systemctl restart firewalld.service
iptables -L -n|grep 80