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在安装好了MySQL之后，使用了新的配置文件后，MySQL服务器可以成功启动，但在登陆的时候出现了ERROR 2002 (HY000): Can't connect to local MySQL server through socket，即无法通过socket连接到mysql服务器，同时提供了socket文件的位置。下面是这个问题的描述与解决办法。

1、故障现象

代码如下:

[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)

#故障环境

[root@SZDB mysqldata]# more /etc/issue

CentOS release 5.9 (Final)

Kernel \r on an \m

2、故障分析

代码如下:

#查看mysql实例的状态

[root@SZDB mysqldata]# netstat -ntlp | grep 3306

tcp 0 0 :::3306 :::* LISTEN 13001/mysqld

#查看my.cnf关于socket的配置

[root@SZDB mysqldata]# more /etc/my.cnf |grep sock

socket = /tmp/mysql.sock

#由上可知my.cnf中定义的为/tmp目录下，而错误提示为/data/mysqldata/目录下

#也就是说mysqld已经声称了正确的sock文件，但客户端连接还是从初始目录去找sock文件

#下面查看后台日志，有个ERROR，是关于满查询日志的，是由于目录不存在而产生的错误，与当前故障无关

[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、解决故障

a、通过配置my.cnf mysql选项socket文件位置解决

代码如下:

#先停止mysql服务器

[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 #添加该行

#重启mysql服务器

[root@SZDB mysqldata]# service mysqld start

Starting MySQL..[ OK ]

#再次连接正常

[root@SZDB mysqldata]# mysql -uroot -p

Enter password:

mysql> show variables like 'version';

+---------------+------------+

| Variable_name | Value |

+---------------+------------+

| version | 5.6.12-log |

+---------------+------------+

b、为socket文件建立链接方式

代码如下:

[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，所以删除之前的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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