[Mongrel] Problems monitoring Mongrel with F5 BigIP

Brandorr brandorr at opensolaris.org
Fri Aug 10 20:16:51 EDT 2007


I also suspect you are going to have to explicitly close the
connection in your monitor, if you aren't already doing so.

On 8/10/07, Brandorr <brandorr at opensolaris.org> wrote:
> I've never tried this but if you want to ping me offline, I have a
> good deal of bigip experience.
>
> I figure it will be useful for me to know how to do this.
>
> I'll need the relevant monitor in bigip.conf.
>
> On 8/10/07, Christopher Bailey <chris at codeintensity.com> wrote:
> > If this has already been covered, please point me to that (I didn't find
> > anything in my searches)...
> >
> > We are using F5 BigIP LTM load balancers.  They have many pools of
> Mongrels
> > they load balance across, and I of course want the F5 to know when a
> Mongrel
> > goes down or is unavailable, etc.  To do that, I need to have an F5 health
> > monitor for HTTP make a request to the Mongrel.  We do this same thing
> with
> > our Nginx servers, and that works fine, but with Mongrel it doesn't.  I am
> > wondering if anyone is successfully monitoring Mongrel instances from an
> > F5?
> >
> > As further info...  I've been working with F5 tech support on this, and
> > we're both stumped at the moment.  The same HTTP monitor works fine with
> > Nginx.  Both try to fetch the same HTML file.  Also, if I am ssh'ed in to
> > the F5, and do a telnet to one of the Mongrels and do "GET /heartbeat.html
> > HTTP/1.1", followed by two returns, this works fine.  I use that same
> string
> > (and two \n's) in my F5's send string for it's HTTP monitor.  According to
> > F5 who looked at our tcpdump, the Mongrel just never responds (but in the
> > same dump, they see the direct telnet version respond fine).  The F5 makes
> a
> > direct TCP request to do this.
> >
> > Any ideas?  Suggestions?  Known issue?  Workarounds?  Anyone successful
> with
> > this type of setup?
> >
> > As an FYI, our system info:
> >
> > CentOS 5, nearly all up to date, 64bit, Core 2 Duo processor
> > Mongrel 1.0.1
> > Mongrel Cluster 1.0.2
> > Ruby 1.8.5 (2006-08-25) [x86_64-linux]
> >
> > F5 BigIP LTM, currently running 9.1.2 (working on moving to 9.3)
> >
>


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