报错：ERROR! MySQL is running but PID file could not be found

原因：mysql进程异常

解决办法：找到并kill掉所有关于mysql的进程

执行==》ps -ef | grep mysql  查看相关进程

执行==》kill 进程号

 启动MySQL服务

        sudo /usr/local/mysql/support-files/mysql.server start

停止MySQL服务

        sudo /usr/local/mysql/support-files/mysql.server stop

重启MySQL服务

        sudo /usr/local/mysql/support-files/mysql.server restart