Can’t connect to local MySQL server through socket

mysql,Mysqldump,Mysqladmin,php连接mysql服务常会提示下面错误：

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

这是由于修改mysql服务的了socket文件mysql.sock位置，而导致无法通过mysql socket文件连接到mysql服务引起的，具体解决办法如下：
1、查看mysql服务的socket文件位置：
mysql socket文件的位置是在/etc/my.cnf中设置的，cat /etc/my.cnf内容如下：

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[mysqld] datadir=/storage/db/mysql socket=/storage/db/mysql/mysql.sock user=mysql

其中socket等于的路径就是socket文件的位置，我们只要修改my.cnf文件,告诉mysql,mysqldump,mysqladmin mysql服务的socket位置在哪里就可以。

2、修改my.cnf文件：

在/etc/my.cnf文件中添加如下内容，并重启mysqls服务，即可解决mysql,mysqldump,mysqladmin的“Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'”问题：

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[mysqld]datadir=/storage/db/mysqlsocket=/storage/db/mysql/mysql.sock [mysql]socket=/storage/db/mysql/mysql.sock [mysqldump]socket=/storage/db/mysql/mysql.sock [mysqladmin]socket=/storage/db/mysql/mysql.sock

3、php连接mysql服务提示"Can't connect to local MySQL server through socket..."的解决方法
有时候mysql服务正常运行,用户名密码也完全正确，使用php的mysql_connect函数却连接不了mysql，调用php的mysql_error()函数提示“Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'”，这是我们需要修改/etc/php.ini文件。
在/etc/php.ini文件中"[MySQL]"项下找到"mysql.default_socket"，并设置其值指向正确的mysql服务socket文件即可，如:

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[MySQL] ...省略n行... mysql.default_socket = "/storage/db/mysql/mysql.sock"

4、python连接mysql提示"Can't connect to local MySQL server through socket..."的解决方法:

在连接mysql数据库函数中指定socket文件，如下：

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#!/usr/bin/pythonfrom MySQLdb import connectconn = connect(db="pzy", user="root", host="localhost", unix_socket="/storage/db/mysql/mysql.sock")cur = conn.cursor()count=cur.execute("show databases")print 'there has %s dbs' % countconn.commit()conn.close()

5. php pdo连接mysql提示"Can't connect to local MySQL server through socket..."的解决方法:
同样在连接字符串添加mysql socket文件的位置即可，如下:

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<?php $dsn = "mysql:host=localhost;dbname=pzy;unix_socket=/storage/db/mysql/mysql.sock"; $db = new PDO($dsn, 'root', ''); $rs = $db->query("SELECT * FROM qrtest"); while($row = $rs->fetch()){ print_r($row); } ?>