MySQL錯誤ERROR 2002 (HY000): Can't connect to local MySQL server

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這篇文章主要介紹了MySQL錯誤ERROR 2002 (HY000): Can't connect to local MySQL server through socket,需要的朋友可以參考下

 

在安裝好了MySQL之后，使用了新的配置文件后，MySQL服務器可以成功啟動，但在登陸的時候出現了ERROR 2002 (HY000): Can't connect to local MySQL server through socket，即無法通過socket連接到mysql服務器，同時提供了socket文件的位置。下面是這個問題的描述與解決辦法。

1、故障現象

復制代碼 代碼如下:

[root@SZDB mysqldata]# mysql -uroot -p123456
Warning: Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/data/mysqldata/mysql.sock' (111)
#故障環境
[root@SZDB mysqldata]# more /etc/issue
CentOS release 5.9 (Final)
Kernel \r on an \m

2、故障分析

復制代碼 代碼如下:

#查看mysql實例的狀態
[root@SZDB mysqldata]# netstat -ntlp  | grep 3306
tcp        0      0 :::3306                     :::*                        LISTEN      13001/mysqld
#查看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文件，但客戶端連接還是從初始目錄去找sock文件
#下面查看后台日志，有個ERROR，是關於滿查詢日志的，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

3、解決故障

a、通過配置my.cnf mysql選項socket文件位置解決

復制代碼 代碼如下:

#先停止mysql服務器
[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  #添加該行
#重啟mysql服務器
[root@SZDB mysqldata]# service mysqld start
Starting MySQL..[  OK  ]
#再次連接正常
[root@SZDB mysqldata]# mysql -uroot -p
Enter password:
mysql> show variables like 'version';
+---------------+------------+
| Variable_name | Value      |
+---------------+------------+
| version       | 5.6.12-log |
+---------------+------------+

b、為socket文件建立鏈接方式

復制代碼 代碼如下:

[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    #上面提示文件存在，所以刪除之前的mysql.sock文件
[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 |
+---------------+-----------------+

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