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Re: [hobbit] Monitoring hosts behind a load balancer
- To: hobbit (at) hswn.dk
- Subject: Re: [hobbit] Monitoring hosts behind a load balancer
- From: Ralph Mitchell <ralphmitchell (at) gmail.com>
- Date: Tue, 15 Jun 2010 13:54:25 -0400
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On Tue, Jun 15, 2010 at 1:03 PM, Ryan Novosielski <novosirj (at) umdnj.edu>wrote:
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> Steve Holmes wrote:
> >
> > On Tue, Jun 15, 2010 at 12:42 PM, Ralph Mitchell
> > <ralphmitchell (at) gmail.com <mailto:ralphmitchell (at) gmail.com>> wrote:
> >
> > I used to have some scripts that would make SOAP requests to an F5
> > to get the pools and pool member status. I no longer have access to
> > that system, but I may have a backup at home.
> >
> > I based my scripts on a bunch of example programs in the F5 SDK.
> > IIRC, I altered a couple of the perl scripts to output lines like:
> >
> > pool1 server1 OK
> > pool1 server2 DOWN
> > etc...
> >
> > Then you just run around a loop reading the lines and sending BB
> > status messages.
> >
> > As long as your F5 is checking the servers occasionally, this
> > approach works OK.
> >
> > Ralph Mitchell
> >
> >
> > On Tue, Jun 15, 2010 at 12:07 PM, Steve Holmes <sholmes42 (at) mac.com
> > <mailto:sholmes42 (at) mac.com>> wrote:
> >
> > Greetings, I'm monitoring several Solaris 10 servers which are
> > behind an F5 load balancer. One of the features of the F5 is
> > that it answers pings for all of the hosts behind it, even if
> > they are all down. Has anyone devised a method of testing the
> > servers for being alive in this context? There are no other
> > network based tests being done. Yes, all of the other tests
> > eventually go purple in Xymon, but we'd like to know that the
> > hosts are down when that happens.
> >
> > Thanks,
> > Steve Holmes
> > ITaP/Purdue University
> >
> >
> >
> > Thanks! I'll check with the F5 admin to see if this might be doable.
> > Steve
>
> It would not surprise me though if this is exactly what the F5 devmon
> template gives you via SNMP. Might be worth a check. If you just
> download the tar and look at the templates directory under F5, you'll
> the OID's file should tell you what's monitored. Hate to see duplication
> of effort. :)
You may well be right. I couldn't tell, back then, because my ex-employer
had a habit of blocking SNMP traffic. That might have changed now that
they're under new ownership... :)
Ralph Mitchell