MySQL无法启动：start request repeated too quickly for mysqld.service

错误分析：

早上起来打开网站，发现不能访问了，报错显示：Error establishing a database connection，不用说，肯定又是MySQL数据库宕了...

赶紧火急火燎的登上服务器，

ps -ef |grep mysql一看，果然是。

尝试重新启动MySQL，

提示：Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

按图索骥，用提示的systemctl命令查看一下：
systemctl status mysqld.service

提示：start request repeated too quickly for mysqld.service，

查看日志结果是没权限
cat /var/log/mysqld.log

然后给这个/tem授权777
重启好使了

启动 systemctl start mysqld
停止 systemctl stop mysqld
重启 systemctl restart mysqld