查询日志，发现连接mysql报错，web页面显示server internal error（500）
解决方法：重启mysql服务器
systemctl start mysqld
#安装mysql
#下载mysql源安装包
wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm #安装mysql源
yum localinstall mysql57-community-release-el7-8.noarch.rpm
yum install mysql-devel #安装MySQL
yum install mysql-community-server #启动MySQL服务
systemctl start mysqld #查看MySQL的启动状态
systemctl status mysqld #开机启动
systemctl enable mysqld