我的是CentOS6.3+MySQL5.1.57。重启了一次服务器后,使用 mysql -u root -p登陆是出现下面的错误: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) 于是,我检察mysql状态: /etc/rc.d/init.d/mysqld statu
我的是CentOS6.3+MySQL5.1.57。重启了一次服务器后,使用> mysql -u root -p登陆是出现下面的错误:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
于是,我检察mysql状态:
> /etc/rc.d/init.d/mysqld status
显示stop,未运行。
>/etc/rc.d/init.d/mysqld restart
Stopping mysqld: [ OK ]
MySQL Daemon failed to start.
Starting mysqld: [ FAILED]
>ps -ef | grep mysql
root 28221 27474 0 14:18 pts/0 00:00:00 grep mysql 只有这一条
至此,我可以确定,mysql无法启动。
我开始排错,首先发现/tmp/mysql.sock不存在
>vim /etc/my.cnf
socket=/var/lib/mysql/mysql .sock
/var/lib/mysql/mysql .sock同样不存在
>find / -name mysql.sock
显示为空,未查询到mysql.sock文件,mysql.sock文件丢失了。
我看网上有人说mysql.sock套接字文件可以简单地通过重启服务器重新创建得到它,
>init 6 重启命令
重启后发现错误还是那样,没有任何改变,mysql.sock重启服务器未自动生成。
接下来了解到mysql.sock是一个临时文件,在mysql启动时会自动生成,我的服务器未启动,自然就没有mysql.sock文件。
我尝试安全启动模式,mysqld_safe试图通过工作目录找到服务器和数据库,但mysqld_safe还是失败。
>mysqld_safe &
Starting mysqld daemon with databases from ....../mysql/var
STOPPING server from pid file .......pid
130802 15:17:11 mysqld ended
各种命令尝试无效的情况下,我开始了本次最大的收获----学会看错误日志。
在错误日志中,,启动失败的原因极为明显,file ‘./mysql-bin。000004’ not found,failed to open!
mysql开启了bin日志功能,到数据库根目录查看该文件是存在的,可能是文件权限的问题。
>chown -R mysql:mysql /....../mysql/var
>mysqld_safe &
>/etc/rc.d/init.d/mysqld restart
Stopping mysqld: [ OK ]
Starting mysqld: [ OK]
成功启动了!~
此时mysql.sock文件出现了,在/var/lib/mysql/mysql .sock。如下图所示,以”s”开头的文件都是socket文件。
> mysql -u root -p
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
/tmp/mysql.sock
解决这个错误很简单,因为/tmp/mysql.sock不存在,用这样的方法:
>ln -s /var/lib/mysql/mysql .sock /tmp/mysql .sock
以”l”开头的文件是软链接文件。或者可以通过修改/etc/my.cnf文件来修正它。
成功解决了!~
就是这样一个问题折腾了我这么久,错误日志让它无所遁形。查看错误日志可以明确问题所在,而不是像我之前那样盲目的找错。
俗话说授人以鱼不如授人以渔,学会查看日志,你也可以方便快捷的解决问题了。
错误使人进步,我与这个错误斗争了四个多小时,对linux的“一切皆文件”这句话有了更深的了解,对我学习文件系统管理(目录树)有很大的帮助,让我的思维真正的从windows操作系统转向成linux系统。并最终解决问题,很有成就感,我喜欢这种感觉。

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