[root@mastermysql]#mysql-uroot-pjsbERROR2002(HY000):Can'tconnecttolocalMySQLserverthro

[root@master mysql]# mysql -uroot -pjsb

ERROR 2002 (HY000): Can`t connect to local MySQL server through socket `/var/lib/mysql/mysql.sock` (2)

#檢視mysql例項的狀態
[root@SZDB mysqldata]# netstat -ntlp  | grep 3306
tcp        0      0 :::3306                     :::*                        LISTEN      13001/mysqld
#檢視my.cnf關於socket的配置
[root@SZDB mysqldata]# more /etc/my.cnf |grep sock
socket = /tmp/mysql.sock
#由上可知my.cnf中定義的為/tmp目錄下，而錯誤提示為/data/mysqldata/目錄下
#也就是說mysqld已經聲稱了正確的sock檔案，但客戶端連線還是從初始目錄去找sock檔案
#下面檢視後臺日誌，有個ERROR，是關於滿查詢日誌的，是由於目錄不存在而產生的錯誤，與當前故障無關
[root@SZDB mysqldata]# more SZDB.err
             …………
2014-10-11 13:17:21 13001 [Note] InnoDB: 5.6.12 started; log sequence number 1625997
/app/soft/mysql/bin/mysqld: File `/log/mysql_logs/slowquery.log` not found (Errcode: 2 – No such file or directory)
2014-10-11 13:17:21 13001 [ERROR] Could not use /log/mysql_logs/slowquery.log for logging (error 2). Turning logging off for the who
le duration of the MySQL server process. To turn it on again: fix the cause, shutdown the MySQL server and restart it.
2014-10-11 13:17:21 13001 [Note] Server hostname (bind-address): `*`; port: 3306
2014-10-11 13:17:21 13001 [Note] IPv6 is available.
2014-10-11 13:17:21 13001 [Note]   – `::` resolves to `::`;
2014-10-11 13:17:21 13001 [Note] Server socket created on IP: `::`.
2014-10-11 13:17:21 13001 [Note] Event Scheduler: Loaded 0 events
2014-10-11 13:17:21 13001 [Note] /app/soft/mysql/bin/mysqld: ready for connections.
Version: `5.6.12-log`  socket: `/tmp/mysql.sock`  port: 3306  Source distribution

#先停止mysql伺服器
[root@SZDB mysqldata]# service mysqld stop
Shutting down MySQL.[  OK  ]
#修改my.cnf，如下
[root@SZDB mysqldata]# vi /etc/my.cnf
[mysql]
no-auto-rehash
socket = /tmp/mysql.sock  #新增該行
#重啟mysql伺服器
[root@SZDB mysqldata]# service mysqld start
Starting MySQL..[  OK  ]
#再次連線正常
[root@SZDB mysqldata]# mysql -uroot -p
Enter password:
mysql> show variables like `version`;
+—————+————+
| Variable_name | Value      |
+—————+————+
| version       | 5.6.12-log |
+—————+————+

解決方法

[root@SZDB mysqldata]# ln -s /tmp/mysql.sock /data/mysqldata/mysql.sock

ln: creating symbolic link `/data/mysqldata/mysql.sock` to `/tmp/mysql.sock`: File exists
[root@SZDB mysqldata]# rm mysql.sock    #上面提示檔案存在，所以刪除之前的mysql.sock檔案
[root@SZDB mysqldata]# ln -s /tmp/mysql.sock /data/mysqldata/mysql.sock
[root@SZDB mysqldata]# ls -hltr mysql.sock
lrwxrwxrwx 1 root root 15 Oct 11 14:00 mysql.sock -> /tmp/mysql.sock
[root@SZDB mysqldata]# mysql -uroot -p
Enter password:
mysql> show variables like `socket`;
+—————+—————–+
| Variable_name | Value           |
+—————+—————–+
| socket        | /tmp/mysql.sock |
+—————+—————–+