ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' （2）

登錄伺服器，使用root用戶連接mysql時出現錯誤提示：

$ bin/mysql -uroot -p
Enter password: 
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

嘗試重啟mysql

$ ./mysql.server restart
Shutting down MySQL (Percona Server).......                [  OK  ]
rm: cannot remove `/var/lock/subsys/mysql': Permission denied
Starting MySQL (Percona Server)..                          [  OK  ]
[mysql@tongxtx mysql]$ bin/mysql -uroot -p
Enter password: 
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

還是報同樣的錯。先看一下my.cnf

more my.cnf |grep sock
socket               = /opt/mysql/mysql.sock
socket              = /opt/mysql/mysql.sock

可以看到我的mysql已經聲明瞭mysql.sock的文件位置，而錯誤提示為/tmp/mysql.sock; 也就是說雖然我的mysql聲明瞭sock文件的位置，但是客戶端在連接的時候, linux系統總是去/tmp目錄下去找，找到了原因，就可以對症下藥了：

為mysql.sock創建鏈接文件：

$ ln -s /opt/mysql/mysql.sock /tmp/mysql.sock