特征
假设你遇到例如以下所列的不论什么问题之中的一个,本文或许能帮到你.
-
MySQL starts/stops properly when started/stopped with the mysqld service restart, but MySQL does not start when a server is rebooted.
-
After upgrading MySQL, binaries mysqld will not start at all.
-
After relocating the MySQL datadir or changing the default port, MySQL does not start.
以上全部问题有一个共同特征:你无法使用service mysqld restart/start或其它方式启动mysql.
| [root@server ~]# /etc/init.d/mysqld start Another MySQL daemon already running with the same unix socket. Starting mysqld: [FAILED] |
原因
非正常的关闭/停止服务,导致mysqld的socket没有被移除. 该非正常的方式比較常见于:系统断电重新启动.
解决的方法
There are several common cases when the socket file is not removed. Please check the below use cases and apply the appropriate resolution.
1. 查看/var/log/mysqld.log,你会发现相似例如以下日志:
|
|
131207
21:15:47
mysqld_safe
Starting
mysqld
daemon
with
databases
from
/var/lib/mysql
/usr/libexec/mysqld:
Can‘t
create/write to file ‘/tmp/ib0h0Wt3‘
(Errcode: 13)
131207
21:15:47 InnoDB: Error: unable to create temporary file; errno: 13
131207
21:15:47 [ERROR] Plugin ‘InnoDB‘
init function returned error.
131207
21:15:47 [ERROR] Plugin ‘InnoDB‘
registration as a STORAGE ENGINE failed.
131207
21:15:47 [Note] Event Scheduler: Loaded 0 events
131207
21:15:47 [Note] /usr/libexec/mysqld: ready for connections.
Version:
‘5.1.71‘ socket:
‘/var/lib/mysql/mysql.sock‘ port:
3306 Source
distribution
|
网上百度到该问题的解决的方法都是:
| rm /var/lib/mysql/mysql.sock |
|
|
<span
style="font-family:
monospace;">mv
/var/lib/mysql/mysql.sock
/var/lib/mysql/mysql.sock.bak</span>
|
笔者试了非常多此,发现还是启动不成功.细看log,文本末尾写着的不仅仅/var/lib/mysql/mysql.sock,还有/var/lib/mysql/mysql1.sock,/var/lib/mysql/mysql22.sock.而我的文件夹文件夹中也正好存在这些文件.于是猜想, mysql异常关闭之后,不单仅仅产生myql.sock,还有其它sock文件,我将这三个sock文件都重命名后,myql便正常启动了.
| rm /var/lib/mysql/mysql.sock |
|
|
rm
/var/lib/mysql/mysql1.sock
|
|
|
rm
/var/lib/mysql/mysql22.sock
|
2. 总结
mysql异常关闭时,产生的sock文件可能存在多个,要将这些sock文件都清除,mysql才干正常启动.
原文链接:Unable to start MySQL service. Another MySQL daemon is already running with the same UNIX socket.
参考:http://kb.sp.parallels.com/en/119334
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