[hobbit] Monitoring hosts behind a load balancer

[Ryan Novosielski]

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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. :)

- --
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|Y#| |  | |\/| |  \ |\ |  | |Ryan Novosielski - Sr. Systems Programmer
|$&| |__| |  | |__/ | \| _| |novosirj at umdnj.edu - 973/972.0922 (2-0922)
\__/ Univ. of Med. and Dent.|IST/CST-Academic Svcs. - ADMC 450, Newark
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