Mysql启动报ERROR：2002的分析与解决

前言

本文主要给大家介绍了关于mysql/' target='_blank'>mysql启动报ERROR：2002的分析与解决，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。

1、故障现象

[root@localhost scripts]# MySQL -u rootERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysqld.sock' (2)

2、故障分析

查看mysql实例的状态

[root@localhost scripts]# netstat -ntlp | grep 3306tcp 0 0 :::3306   :::*   LISTEN 13001/mysqld

查看my.cnf关于socket的配置

[root@localhost scripts]# more /etc/my.cnf |grep socksocket = /tmp/mysqld.sock

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@localhost scripts]# 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 whole 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: 33062014-10-11 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 events2014-10-11 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#Author ：Leshami#Blog : http://www.linuxidc.com

3、解决故障

a、通过配置my.cnf mysql选项socket文件位置解决

先停止mysql服务器

[root@localhost scripts]# systemvtl restart mysqldShutting down MySQL.[ OK ]

修改my.cnf，如下

[root@localhost scripts]# vi /etc/my.cnf[mysql]no-auto-rehashsocket = /tmp/mysqld.sock #添加该行

重启mysql服务器

[root@localhost scripts]# systemctl restart mysqld Starting MySQL..[ OK ]

再次连接正常

[root@localhost scripts]# mysql -uroot -pEnter 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

[root@SZDB mysqldata]# ln -s /tmp/mysql.sock /data/mysqldata/mysql.sockln: 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.socklrwxrwxrwx 1 root root 15 Oct 11 14:00 mysql.sock -> /tmp/mysql.sock[root@SZDB mysqldata]# mysql -uroot -pEnter password:mysql> show variables like 'socket';+---------------+-----------------+| Variable_name | Value  |+---------------+-----------------+| socket | /tmp/mysql.sock |+---------------+-----------------+

总结

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