进程残留导致 MySQL 无法启动，MySQL 启动失败，错误提示：Starting MySQL. ERROR! Manager of pid-file quit without updating file. [root@iZ9410f0jqiZ bin]# Starting MySQL. ERROR! Manager of pid-file quit without updating file.
磁盘空间满导致 MySQL 无法启动, 启动 MySQL 报错：ERROR! MySQL manager or server PID file could not be found! Starting MySQL. ERROR! Manager of pid-file quit without updating file.
