centos7 yum安装 mariadb

从最新版本centos7开始，默认的是 Mariadb而不是mysql！使用系统自带的repos安装很简单：yum install mariadb mariadb-server
systemctl start mariadb ==> 启动mariadb
systemctl enable mariadb ==> 开机自启动
firewall-cmd --permanent --add-port=3306/tcp ==> 开放端口，允许远程访问systemctl restart firewalld==> 重启防火墙mysql_secure_installation ==> 设置 root密码等相关
mysql -uroot -p密码 ==> 测试登录！授权root远程任何机器都能登陆use mysql;update mysql set host='%' where user='root' and host='localhost';flush privileges;或grant all privileges on *.* to 'root@%' identified by '密码' with grant option; flush privileges;
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