Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
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ERROR 2002 (HY000): Can't connect to local MySQL server through socket '***' (2)
有时候,当我们使用“mysql”、“mysqladmin”、“mysqldump”等命令管理数据库时,服务器抛出类似如下错误:这个错误是由于什么原因导致的呢?请看后面爱E族(aiezu.com)为您提供的分析。
通过上面实验可以看出,前面两种方式都能产生标题中的错误,而第三种方式连接是不会产生标题中的错误的(第三种方式这里产生的是由于密码问题拒绝访问的错误信息)(爱E族)。
修改完后,重启mysqld服务,即可解决此问题。
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ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
一、错误现场还原:
下面我们通过三种方式来连接,然后观察提示的错误信息:- 1、直接使用“mysql”命令,不带主机名参数;
- 2、使用带了主机名“localhost”参数的“mysql -h localhost”命令;
- 3、使用带了主机名“127.0.0.1”参数的“mysql -h 127.0.0.1”命令。
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[root@aiezu.com ~]
# mysql
ERROR 2002 (HY000): Can
't connect to local MySQL server through socket '
/var/lib/mysql/mysql
.sock' (2)
[root@aiezu.com ~]
# mysql -h localhost
ERROR 2002 (HY000): Can
't connect to local MySQL server through socket '
/var/lib/mysql/mysql
.sock' (2)
[root@aiezu.com ~]
# mysql -h 127.0.0.1
ERROR 1045 (28000): Access denied
for
user
'root'
@
'localhost'
(using password: NO)
二、错误产生原因解析:
这是由于我们连接数据库使用的主机名参数为“localhost”,或者未使用主机名参数、服务器默认使用“localhost”做为主机名(爱E族)。 使用主机名参数为“localhost”连接mysql服务端时,mysql客户端会认为是连接本机,所以会尝试以socket文件方式进行连接(socket文件连接方式,比“ip:端口”方式效率更高),这时根据配置文件“/etc/my.cnf”的路径,未找到相应的socket文件,就会引发此错误。三、修复故障前准备:
1、看mysql服务是否在运行:
由于“socket”文件是由mysql服务运行时创建的,如果提示“ERROR 2002 (HY000): Can't connect to local MySQL server through socket '***' (2)”,找不到“socket”文件,我们首先要确认的是mysql服务是否正在运行。1
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# 1、 端口是否打开
[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服务是否正在运行
[root@aiezu.com ~]
# service mysqld status
mysqld (pid 4717) is running...
# 3、如果mariadb,同样方法查服务是否正在运行:
[root@aiezu.com ~]
# service mariadb status
Redirecting to
/bin/systemctl
status mariadb.service
● mariadb.service - MariaDB database server
Loaded: loaded (
/usr/lib/systemd/system/mariadb
.service; disabled; vendor preset: disabled)
Active: active (running) since 四 2016-11-03 13:47:37 CST; 23min ago
2、确定“socket”文件正确位置:
确定mysql服务正常运行后,产生此错误的原因只剩下“socket”文件路径不正确了,我们可以使用“find”命令或者“lsof”命令来确定socket文件的正确路径:1
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[root@aiezu.com ~]
# lsof -c mysqld|grep sock$
mysqld 4717 mysql 12u unix 0xffff88010a655b80 0t0 77474827
/storage/db/mysql/mysql
.sock
[root@aiezu.com ~]
# find / -name '*.sock'
/storage/db/mysql/mysql
.sock
四、故障解决方法:
解决方案一:
修改“/etc/my.cnf”配置文件,在配置文件中添加“[client]”选项和“[mysql]”选项,并使用这两个选项下的“socket”参数值,与“[mysqld]”选项下的“socket”参数值,指向的socket文件路径完全一致。如下:1
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[mysqld]
datadir=/storage/db/mysql
socket=/storage/db/mysql/mysql.sock
...省略n行(爱E族)...
[client]
default-character-set=utf8
socket=/storage/db/mysql/mysql.sock
[mysql]
default-character-set=utf8
socket=/storage/db/mysql/mysql.sock
解决方案二:
使用“ln -s /storage/db/mysql/mysql.sock /var/lib/mysql/mysql.sock”命令,将正确的socket文件位置,软链接到提示错误的socket文件路径位置,即可解决此问题:1
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[root@aiezu.com ~]
# ls /var/lib/mysql/mysql.sock
ls
: cannot access
/var/lib/mysql/mysql
.sock: No such
file
or directory
[root@aiezu.com ~]
# ln -s /storage/db/mysql/mysql.sock /var/lib/mysql/mysql.sock
[root@aiezu.com ~]
# ls /var/lib/mysql/mysql.sock
/var/lib/mysql/mysql
.sock
五、后序:
这篇文章只讲述了mysql提供的“mysql”、“mysqldump”、“mysqladmin”等命令提示“ERROR 2002 (HY000): Can't connect to local MySQL server through socket '***' (2)”的解决方法阅读全文
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