1、故障现象
[root@localhost scripts]# mysql -u root ERROR 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 3306 tcp 0 0 :::3306 :::* LISTEN 13001/mysqld
查看my.cnf关于socket的配置
[root@localhost scripts]# more /etc/my.cnf |grep sock socket = /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 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 #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 mysqld Shutting down MySQL.[ OK ]
修改my.cnf,如下
[root@localhost scripts]# vi /etc/my.cnf [mysql] no-auto-rehash socket = /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 -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
[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 | +---------------+-----------------+
原创文章,作者:N27_Danry,如若转载,请注明出处:http://www.178linux.com/85634