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注意事项：
先关闭虚拟机防火墙 关闭防火墙命令：
systemctl stop firewalld.service
如果权限不够 在命令前加sudo(超级管理员)
安装mysql数据库步骤：
sudo yum install mysql sudo yum install mariadb-server mariadb sudo yum
install mysql-devel
启动mysql数据库：
systemctl start mariadb
登录mysql数据库：
mysql -u root
登录后切换到mysql数据库：
use mysql
修改用户root的密码，修改为111111：
set password for 'root'@'localhost' =password('111111');
授权：
grant all privileges on *.* to root@'%'identified by '111111';
重启数据库 先退出再重启，退出命令exit
systemctl restart mariadb
停止数据库：
systemctl stop mariadb
