[Mongrel] Problems monitoring Mongrel with F5 BigIP

Jason A. Hoffman jason at joyent.com
Sat Aug 11 02:08:07 EDT 2007


Hi Chris,

We run a bunch of 6400s in production.

You have to terminate the lines with the /r too

GET /heartbeat/index HTTP/1.1
\r\n
\r\n

Our's looks like

http://jxh.bingodisk.com/public/mongrel-bigip.png

Regards, Jason




On Aug 10, 2007, at 7:30 PM, Christopher Bailey wrote:

> That didn't work.  I don't think you need that though.  If I just  
> telnet in to the Mongrel, and do a pure "GET /heartbeat.html HTTP/ 
> 1.1\n\n" it works.  I am going to try running the Mongrel in debug  
> and see, will do that later tonight...
>
>
> On 8/10/07, Brandorr <brandorr at opensolaris.org> wrote: I think you  
> need to close the connection after each health check.
> Otherwise mongrel/rails is going to block. (If my understanding is
> correct.
>
> Try the following health check and let me know how it works out:
>
> "GET / HTTP/1.1\nHost: \nConnection: Close\n
>
> 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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