转发: snmpd&/dev/null error

 

Dear 

Thanks for your help;

I already know; snmpd  -Lsd CLf /var/log/snmpd.log /dev/null is wrong; but
the / dev / null attributes to change; I do not understand what is advanced
through the command or function to / dev / null change, I want to know the
reason; If you can not be answered here, I trouble you to reflect the higher
engineers deep problems; for that; Thank you; 

Thank you

 

 

 

 

[email protected]

 

发件人: Xiang Li [mailto:[email protected]] 
发送时间: 2011年6月4日 8:10
收件人: "张莉|li.zhang"
抄送: [email protected]
主题: Re: snmpd&/dev/null error

 

Fortunately the list administrator did not delete your message as spam
because most of list members would not be able to read Chinese:)

If you look at the SYNOPSIS of snmpd:
snmpd [OPTIONS] [LISTENING ADDRESSES]

The "-Lf" option is only supposed to be followed by a single file. If you
use "snmpd  -Lsd CLf /var/log/snmpd.log /dev/null" then my guess is that
snmpd  thinks the [OPTIONS] part has ended after "-Lf /var/log/snmpd.log"
and consider whatever follows as [Listening Address]. In your case the
listening address would be  "/dev/null".  Since the Unix domain is assumed
if the first character of the <LISTENING-address> is '/', and you were
running snmpd as root so it can do anything, including changing /dev/null
from character device into an unix domain socket.

Thanks
Xiang


On 6/2/2011 11:21 PM, 张莉|li.zhang wrote: 

请问一下，snmpd  -Lsd CLf /var/log/snmpd.log /dev/null Cp
/var/run/snmpd.pid Ca里

Lsd 与Lf都是输出日志，为何加了个snmpd.log会 将/dev/null 属性变掉，这个是通过
哪种机制哪条函数做到的呢；烦请指导，谢谢；

以下是截图；在64位和32位都会出现这个问题；

/dev/null的原始属性是c

cid:[email protected]

 

原始的snmpd配置文件

cid:[email protected]

 

3.修改snmpd文件为以下

cid:[email protected]

 

4.修改后重启snmpd服务(因为之前snmpd服务并没有启动， 所以stopping是failed的)

cid:[email protected]

 

5. 这次重启snmpd服务产生的日志， 并没有报错

cid:[email protected]

 

6. 重启snmpd服务后文件属性从c 变成了s

cid:[email protected]

 

7. 过了一会儿，连接在这台linux上的ssh中ll 命今无法使用， 并出现了no such
device /dev/null 的报错

cid:[email protected]

再次重启snmp报以下错

[root@squid ~]# service snmpd restart

停止 snmpd：/etc/init.d/functions: line 273: /dev/null: 没有那个设备或地址

/etc/init.d/functions: line 278: /dev/null: 没 有那个设备或地址

                                                           [失败]

启动 snmpd：/bin/bash: /dev/null: 没有那个设备或地址

                                                           [确定]

重启系统报以下错：

reboot.png

 

解决办法 是rm Crf /dev/null

Mknod Cm 666 c 1 3

请问一下，snmpd  -Lsd CLf /var/log/snmpd.log /dev/null Cp
/var/run/snmpd.pid Ca里

Lsd 与Lf都是输出日志，为何加了个snmpd.log会 将/dev/null 属性变掉，这个是通过
哪种机制哪条函数做到的呢；烦请指导，谢谢；

 

 

======================================================

Zhang li

Tel:13564143692

 

 

 

 
 
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-- 
Xiang Li
http://www.champnms.com

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Installation's a snap, and flexible recovery options mean your data is safe,
secure and there when you need it. Discover what all the cheering's about.
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