Re: Failed to connect to the agentx master agent

Hello,

I found something strange on SuSE11. 

The Net-SNMP that comes with SuSE11 is 5.4.2.1 which is the same version as I 
used to develop my program. After I started the snmpd, I run command 'netstat -a 
| grep master'. What I got from the command is 


unix  2      [ ACC ]     STREAM     LISTENING     996085 /var/run/agentx/master


It seemed that the snmpd is listening at /var/run/agentx/master. However, I'm 
quite sure that my program uses /var/agentx/master (in file net-snmp-config.h, 
there is #define NETSNMP_AGENTX_SOCKET "/var/agentx/master".

So, it should not work but after I started my program there was a message 
'NET-SNMP version 5.4.2.1 AgentX subagent connected' and my program worked!!! 
Then I run the command 'netstat -a | grep master' again and This is what I see

unix  2      [ ACC ]     STREAM     LISTENING     996085 /var/run/agentx/master
unix  3      [ ]         STREAM     CONNECTED     996240 /var/run/agentx/master

Do you have any ideas about this?

Thanks & regards,
Nop.




________________________________
From: Noppadol Sotanakul <[email protected]>
To: Dave Shield <[email protected]>
Cc: [email protected]
Sent: Tue, February 15, 2011 5:16:34 PM
Subject: Re: Failed to connect to the agentx master agent


Hello,

I've added -x /var/agentx/master when I started snmpd and it worked !!!

Thank you very much for your help and very quick response.

Regards,
Nop.




________________________________
From: Dave Shield <[email protected]>
To: Noppadol Sotanakul <[email protected]>
Cc: [email protected]
Sent: Tue, February 15, 2011 5:04:31 PM
Subject: Re: Failed to connect to the agentx master agent

On 15 February 2011 09:47, Noppadol Sotanakul <[email protected]> wrote:
>> Which ports is the master agent listening on?
>> Compare the list of ports for the 5.3.0.1 agent,
>> with the list of ports for the other agents.
>>
>> Normally, you'd expect the agent to be listening on
>> TCP port 705 and/or the named socket '/var/agentx/master'
>
>
> This is what I get when I run netstat -a | more
>
> Active UNIX domain sockets (servers and established)
> unix  2      [ ACC ]     STREAM     LISTENING     253125 
/var/run/agentx/master

So the agent is listening on /var/run/agentx/master rather than
/var/agentx/master.
This is a more sensible location within the Linux File System  framework
(which is probably why SuSE use it) but is different to the "standard" location.

Try running the master agent using the option -x /var/agentx/master
or configuring your subagent to connect to /var/run/agentx/master

Basically, the two sides need to use the same socket.  What this socket actually
is, doesn't really matter - as long as they agree.

Dave

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