[SNMP4J] Configure agent communities via properties file

[Frank Fock]

Hi Pete,

The second entry in the community table is restored from
persistent storage. If you delete the file before you start
the agent, you will get only one entry (the entry you configured
in the properties file).

Hope this helps.

I will fix the wiki page about the community configuration...

Best regards,
Frank

Am 07.11.2011 18:13, schrieb Pete Dow:
> Hello,
> I built the sample agent (SNMP4J-agent 1.4.3) and ran it with the sample
> agent config properties file.  I can v1-walk the SNMP-COMMUNITY-MIB (using
> community "public").  This is great, but how do I use a community other
> than "public" via properties-file configuration item?
>
> What I've done so far:  here's what I get when I v1-walk the community MIB:
>
> SNMP-COMMUNITY-MIB::snmpCommunityName.'public' = STRING: "public"
> SNMP-COMMUNITY-MIB::snmpCommunitySecurityName.'public' = STRING: public
> SNMP-COMMUNITY-MIB::snmpCommunityContextEngineID.'public' = Hex-STRING: 80
> 00 13 70 01 0A 01 01 03
> SNMP-COMMUNITY-MIB::snmpCommunityContextName.'public' = STRING:
> SNMP-COMMUNITY-MIB::snmpCommunityTransportTag.'public' = STRING:
> SNMP-COMMUNITY-MIB::snmpCommunityStorageType.'public' = INTEGER:
> permanent(4)
> SNMP-COMMUNITY-MIB::snmpCommunityStatus.'public' = INTEGER: active(1)
>
> If I replace all instances of "public" in the sample agent config file from
> "public" to "foo" and then re-run the agent, then I can still use "public"
> to read objects, which I find puzzling (I figure I should not be able to
> use "public" after I made that replacement).  When I v1-walk the community
> MIB after I do that (again using "public" community), I get this:
>
> SNMP-COMMUNITY-MIB::snmpCommunityName.'foo' = STRING: "foo"
> SNMP-COMMUNITY-MIB::snmpCommunityName.'public' = STRING: "public"
> SNMP-COMMUNITY-MIB::snmpCommunitySecurityName.'foo' = STRING: foo
> SNMP-COMMUNITY-MIB::snmpCommunitySecurityName.'public' = STRING: public
> ... etc.
>
> So it looks like "public" is still being used in the agent, that I haven't
> disabled "public" correctly, that "foo" is now in place, and that at least
> I know that changes to the properties file produce some effect.  How do I
> not use "public" and use "foo" instead, via a properties-file configuration
> item?
>
> It looks like I'm on the right track considering my walk results, but that
> there's more to it than a search/replace of "public" in the sample agent
> config properties file.  I haven't been able to figure out what more there
> is to it.
>
> I've searched the list in case this question has been asked before.  I've
> seen similar questions asked in the list, but the answers were not exactly
> what I seek.  E.g., here are some similar threads I found in the list with
> which I could not reach a solution:
>
>
> http://lists.agentpp.org/pipermail/snmp4j/2010-October/004341.html :
> couldn't find a response to this post
>
> http://lists.agentpp.org/pipermail/snmp4j/2009-January/003324.html :
> couldn't find a response to this post
>
> http://lists.agentpp.org/pipermail/snmp4j/2006-April/001251.html : Frank
> posted a response discussing the SnmpCommunityMIB class, but I'm looking
> for a way to do this in a config file (not programmatically and not via
> SNMP-SETs, methods which have been answers in the list already).
>
> http://lists.agentpp.org/pipermail/snmp4j/2008-May/002925.html : I don't
> understand the response.
>
> http://lists.agentpp.org/pipermail/snmp4j/2011-April/004517.html : "edit
> SNMP-COMMUNITY-MIB": implies there's a way to do it, but not discussed or
> referenced.
>
>
> I noticed there's a wiki mentioned in the list; I found a page in the wiki
> FAQ titled "How do I change communities?" but the page is blank.
>
> Scanning the code for uses of hard-coded "public" community turns up in
> code files used only in test scenarios, from what I can tell.
>
> It seems like there's a way to do this (to configure (not via code) the
> agent to not use "public") and I'm just not looking in the right place; can
> anyone point me to the correct resource?
>
> Thanks,
> Pete
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