1、關閉linux後重啟，啟動服務時報ERROR! The server quit without updating PID file (/var/lib/mysql/bogon.pid)
Starting MySQL… ERROR! The server quit without updating PID file (/var/lib/mysql/bogon.pid).

解決方案：
1、授權mysql讀寫許可權：

chmod 777 mysql

2、查詢mysql的pid並關閉

#查詢
ps -ef | grep mysql
#如有，關閉
kill -9 pid

3、關閉防火牆

#centos6.x
chkconfig iptables off
#centos7.x
systemctl stop firewalld