mysqld 啓動報錯：Address already in use

現象：

160826 15:33:33 [Note] Server socket created on IP: '0.0.0.0'.

160826 15:33:33 [ERROR] Can't start server : Bind on unix socket: Address already in use

160826 15:33:33 [ERROR] Do you already have another mysqld server running on socket: /tmp/mysql3306.sock ?

使用lsof -i :3306沒有發現3306端口被佔用

原因：上次mysql沒有正常關閉，生成了一個/tmp/mysql3306.sock 

解決方案：刪除/tmp/mysql3306.sock