Hi,
Apologies for all the questions!
Okay. It looks like I definitely want to use disman event mib to monitor
cpu usage and disk space, and generate the appropriate threshold alarms.
>From my understanding of this, I have two options:
1. Move to 5.1.2 and use the trap call back function to detect when
alarms
have been generated.
2. Write our own master agent, assuming that it can receive
notifications of
all traps. (Is this possible?)
For the other part (I'm talking about having several subagents, using
the same mib, deployed across several nodes). I have the options to:
1. Move to 5.2 where we can change the context name. (I'm still a bit
confused about this yet, as I didn't get it working. Will I still
only
use one OID, but each will have a different context_name? This means
that if I do an snmpwalk, I will get all the values?)
2 If I develop my own Master Agent, would option (a) be possible? It
would
mean that the Master agent would process all the results and return
only
one value to an SNMP get, or add several rows. That way we only need
to
expose one MIB both internally and externally - we can generate all
the
code from this one MIB but each instance would use its own modified
'version' of the OID.
FYI, I have downloaded 5.2 to run these test programs :-)
RedHat does seem to support dlmod. However I don't see how that will be
useful for me for our product specific alarms and counters.
Thanks a lot,
Maria
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robert
Story (Users)
Sent: 04 November 2004 13:29
To: Maria McCafferty
Cc: [EMAIL PROTECTED]
Subject: Re: Master Agent & SNMP MIBs
On Thu, 4 Nov 2004 10:23:19 -0000 Maria wrote:
MM> I've had a quick look at the disman event mib. Is there a way, from
my
MM> code, that I can detect when an alarm has been generated? I have a
MM> requirement to be able to detect this within the code so that I can
log
MM> that a trap has been generated.
Only indirectly. The agent does have a callback when a trap is sent, so
you
could register for that. You would get called for all traps, not just
event mib
alarms, so you would have to peek into the pdu to decide if it is a trap
you
want to act on.
MM> In relation to the Master Agent question, we would prefer to use the
MM> net-snmp version bundled with Red hat (to avoid having to support
it).
Well, then that rules out adding your own callback to the disman event
code.
MM> Additionally, by changing the OIDs, does that in
MM> effect mean either: (a) writing our own Master agent that will
collate
MM> all the information from the different Subagents and 'supply' the
MM> information to a management browser using one OID; (b) supply
multiple
MM> MIBs to a management browser?
(b) Note that I didn't say it was a good option. ;-)
MM> We are currently using 5.0.9, but I see we can upgrade to 5.1.2.
This
MM> may be a problem for us. What do you need to change to register
MM> different contexts?
That depends on how you are registering now. If you are using new style
code,
then the netsnmp_handler_registration structure has a contextName member
that
you should set.
But, as I said earlier, support for contexts in sub-agent is new to 5.2.
I
have no idea how long it will take RedHat to switch to 5.2, so if you
want to
used contexts then you may want to use dynamically loaded modules
instead of a
sub-agent. That assumes, of course, that RedHat enables dlmod support in
their
RPMs. I'm not sure that they do.
--
Robert Story; NET-SNMP Junkie <http://www.net-snmp.org/>
<irc://irc.freenode.net/#net-snmp>
Archive:
<http://sourceforge.net/mailarchive/forum.php?forum=net-snmp-users>
You are lost in a twisty maze of little standards, all different.
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