連線Mysql提示Can’t connect to local MySQL server through socket的解決方法
mysql,mysqldump,mysqldump,php連線mysql服務常會提示下面錯誤:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
產生此問題的原因一般有兩個:
1、mysql服務未正常執行:
由於mysql的socket檔案是由mysqld服務啟動時建立的,如果mysqld服務未正常啟動,socket檔案自然也不會被建立,當然會找不到socket檔案了。對於判斷mysql服務是否啟動,我們可以使用下面命令:
# 1、 埠是否開啟
[root@aiezu.com ~]# lsof -i:3306
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
mysqld 12207 mysql 14u IPv4 52350 0t0 TCP *:mysql (LISTEN)
# 2、mysqld服務是否正在執行
[root@aiezu.com ~]# service mysqld status
mysqld (pid 4717) is running..
2、socket檔案路徑在配置檔案中設定不完整:
這一般是由於我們修改了mysql配置“/etc/my.cnf”引起的。比如我們修改了配置檔案中“[mysql]”選項下的“socket”引數,而未指定“[client]”、“[mysql]”選項的“socket”引數,導致mysql使用預設的socket檔案位置去尋找socket檔案,從而導致未找到socket檔案而引發此錯誤。
解決辦法:
下面是解決方法,更詳細的介紹可以參考:http://aiezu.com/article/mysql_cant_connect_through_socket.html
1、mysql服務未正常執行:
如果是服務未啟動,我們執行“service mysqld start”啟動服務即可。如果服務啟動不了,就去檢視mysql服務日誌,尋找原因並解決再啟動
[root@aiezu.com ~]# service mysqld start
Starting mysqld: [ OK ]
[root@aiezu .com ~]# lsof -i:3306
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
mysqld 14109 mysql 10u IPv4 247183583 0t0 TCP *:mysql (LISTEN)
[root@aiezu.com ~]# service mysqld status
mysqld (pid 14109) is running...
2、完善mysql配置檔案:
如果確認mysql服務正常執行,還提示文章標題的此錯誤,那就是“/etc/my.cnf”配置檔案的問題了。解決辦法是修改“/etc/my.cnf”配置檔案,在配置檔案中新增“[client]”選項和“[mysql]”選項,並使用這兩個選項下的“socket”引數值,與“[mysqld]”選項下的“socket”引數值,指向的socket檔案路徑完全一致。如下:
[mysqld]
datadir=/storage/db/mysql
socket=/storage/db/mysql/mysql.sock
...省略n行(愛E族)...
[client]
default-character-set=utf8
socket=/storage/db/mysql/mysql.sock
[mysql]
default-character-set=utf8
socket=/storage/db/mysql/mysql.sock
其中socket等於的路徑就是socket檔案的位置,我們只要修改my.cnf檔案,告訴mysql,mysqldump,mysqladmin等命令,mysql服務的socket檔案位置在哪裡,然後重啟mysqld服務即可。
3、php連線mysql服務提示”Can’t connect to local MySQL server through socket…”的解決方法
有時候mysql服務正常執行,使用者名稱密碼也完全正確,使用php的mysql_connect函式卻連線不了mysql,呼叫php的mysql_error()函式提示“Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’”,這是我們需要修改/etc/php.ini檔案。
在/etc/php.ini檔案中”[MySQL]”項下找到”mysql.default_socket”,並設定其值指向正確的mysql服務socket檔案即可,如:
[MySQL]
...省略n行...
mysql.default_socket = "/storage/db/mysql/mysql.sock"
4、python連線mysql提示”Can’t connect to local MySQL server through socket…”的解決方法:
在連線mysql資料庫函式中指定socket檔案,如下:
#!/usr/bin/python
from MySQLdb import connect
conn = 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' % count
conn.commit()
conn.close()
- php pdo連線mysql提示”Can’t connect to local MySQL server through socket…”的解決方法:
同樣在連線字串新增mysql socket檔案的位置即可,如下:
<?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);
}
?>
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