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Linux下MySQL错误ERROR 2002 (HY000): Can't connect to local MySQL server through socket

2016-03-07 17:15:39 1921

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): Cant 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。

故障情况:

    [root@landui mysqldata]# mysql -uroot 
    Warning: Using a password on the command line interface can be insecure.
    ERROR 2002 (HY000): Cant connect to local MySQL server through socket /data/mysqldata/mysql.sock (111)
    #故障环境
    [root@landui mysqldata]# more /etc/issue
    CentOS release 5.9 (Final)
    Kernel on an m
故障分析:

    #查看mysql实例的状态
    [root@landui mysqldata]# netstat -ntlp  | grep 3306
    tcp        0      0 :::3306                     :::*                        LISTEN      13001/mysqld
    #查看my.cnf关于socket的配置
    [root@landui 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@landui mysqldata]# more landui.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
解决方法:

1、通过配置my.cnf mysql选项socket文件位置解决

    #先停止mysql服务器
    [root@landui mysqldata]# service mysqld stop
    Shutting down MySQL.[  OK  ]
    #修改my.cnf,如下
    [root@landui mysqldata]# vi /etc/my.cnf
    [mysql]
    no-auto-rehash
    socket = /tmp/mysql.sock  #添加该行
    #重启mysql服务器
    [root@landui mysqldata]# service mysqld start
    Starting MySQL..[  OK  ]
    #再次连接正常
    [root@landui mysqldata]# mysql -uroot -p
    Enter password: 
    mysql> show variables like version;
    +---------------+------------+
    | Variable_name | Value      |
    +---------------+------------+
    | version       | 5.6.12-log |
    +---------------+------------+

2、为socket文件建立链接方式

    [root@landui 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@landui mysqldata]# rm mysql.sock    #上面提示文件存在,所以删除之前的mysql.sock文件
    [root@landui mysqldata]# ln -s /tmp/mysql.sock /data/mysqldata/mysql.sock
    [root@landui mysqldata]# ls -hltr mysql.sock
    lrwxrwxrwx 1 root root 15 Oct 11 14:00 mysql.sock -> /tmp/mysql.sock
    [root@landui mysqldata]# mysql -uroot -p
    Enter password: 
    mysql> show variables like socket;
    +---------------+-----------------+
    | Variable_name | Value           |
    +---------------+-----------------+
    | socket        | /tmp/mysql.sock |
    +---------------+-----------------+

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