[hobbit] Monitoring hosts behind a load balancer

[Ralph Mitchell]

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
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