| 标题 | MySQL错误ERROR 2002 (HY000): Can't connect to local MySQL server |
| 内容 | 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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