原因分析:
1、没有 /var/lib/mysql/mysql.sock 的目录权限
添加权限 chown -R mysql:mysql /var/lib/mysql/
2、没有/var/lib/mysql/mysql.sock文件
通过 find / -name mysql.sock
在 /tmp//mysql.sock
用 ln -s 命令建立连接
或者修改 /etc/my.cnf配置文件,下边有,然后重启
#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 通过配置my.cnf mysql选项socket文件位置解决 复制代码 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 [mysql.server] user=mysql#添加 basedir=/usr/local/mysql#添加 #If there is not currently a section called [client], add one at the bottom of the file and copy the socket= line under the [mysqld] section such as: [client]#添加 socket=/var/lib/mysql/mysql.sock#添加 #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 | +---------------+------------+ 为socket文件建立链接方式 复制代码 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 | +---------------+-----------------+