Re: a question aboat "Writing a Subagent

By default netsnmp agent try to connect to master agentx on default
configuration that is default socket for connection is unix  socket and
that's why following error comes
"Warning: Failed to connect to the agentx master agent ([NIL]):"

Here NIL represent default unix  socket.

Solution :
Either configure agent configuration (example.conf) for connection at
tcp:localhost:1705, snmpd.conf is for SNMP demon for listen at that port (
must be there also)

Or add the following line in your example demon :
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,NETSNMP_DS_AGENT_X_SOCKET,
"tcp:localhost:1705");

Hope this can help you .
On Aug 15, 2015 8:45 PM, "Mostafa Salari" <[email protected]> wrote:

> REALLY SORRY I PRESSED Ctrl+Enter AND NOT COMPLETED EMAIL HAS BEEN SENT
>
> Hello,
> I'm new to net-snmp agent. I am trying to do "Writing a Sub agent"
> tutorial as described in the following link:
>
> http://www.net-snmp.org/wiki/index.php/TUT:Writing_a_Subagent#Test_object_with_subagent
>
> I was successfull to compile and run my own agentx subagent using net-snmp
> --compile-subagent ... as described in the tutorial.
>
> I wrote a sub agent that reads any number of OIDs and Values from a text
> file and registers them via "netsnmp_register_long_instance" function. It
> works! but if the textfile changed the sub agennt must be killed and
> executed again so that snmpwalk shows the new values. SO: I want to write a
> sub agent that read the textfile repeatedly (for example every 5 secs).
>
> It would be thankful if you can help me.
>
> Best regards,
> thanks,
> Mustafa
>
>
> Appendix:
> I thought that maybe "Instrumenting your own code with agentx subagent
> support" topic in the above link can help me to write such a sub agent! So
> I tried to do the tutorial. But I cant get answere from "exemple-demon"
>
> The [make example-demon] command is successful, next I execute [*./example-demon
> &*] to sun the sub agent. but the "Warning: Failed to connect to the
> agentx master agent ([NIL]):" message is shown repeatedly after
> executation. Note thet I run snmpd with the following configuration
> before running example-demon:
> "
> #com2sec paranoid  default         public
> com2sec readonly  default         public
> com2sec readwrite default         private
> rocommunity public
> rwcommunity private
>  group MyROGroup v1 readonly
> view all included .1 80
> access MyROGroup "" any noauth exact all none none
> master agentx
> agentXSocket tcp:localhost:1705
> "
>
> Also the command [snmpget -c public -v1 localhost
> NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0] says that:
> "Error in packet
> Reason: (noSuchName) There is no such variable name in this MIB.
> Failed object: NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0"
>
> while I copied NET-SNMP-TUTORIAL-MIB.txt file in
> "/usr/local/share/snmp/mibs" directory and I append the file name to the
> end of "/var/net-snmp/mib_indexes/0" file!
>
> WHAT CAN I DO?
> THANKS.
>
>
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