HAProxy, NGINX and Rails anyone?

[Igor Sysoev]

On Wed, Jul 30, 2008 at 10:46:41PM +0200, Redd Vinylene wrote:

> Is there any chance nginx' load balancing will ever be as good as haproxy?

There is third-party module:
http://wiki.codemongers.com/NginxHttpUpstreamFairModule

And I'm going to improve nginx load balancing.

> On Wed, Jul 30, 2008 at 7:19 PM, Brian Gupta <brian.gupta at gmail.com> wrote:
> > On Mon, Jul 28, 2008 at 8:57 AM, Patrick Viet <patrick.viet at gmail.com> wrote:
> >> Yes : don't use haproxy.
> >> Why would you want to use haproxy over nginx when nginx can already do your
> >> balancing ?
> >> Sure, haproxy is a little faster than nginx, but if nginx is there anyway,
> >> just use it.
> >> That will definitely be lighter.
> >
> > Nginx's load balancing algorithm's is fairly simplistic. If you are
> > going to be seeing any sort of sustained traffic, and are running with
> > more than 2 or three backend mongrels, Rails can really benefit from
> > haproxy's ability to limit connections to a single connection per back
> > end rails/mongrel instance.  (Fro those that don't know each backend
> > Rails instance is a single threaded app. So they can only handle one
> > web request at at time. If more are sent the go into a block IO wait
> > state.)
> >
> > Where this really helps is when a web request that initiates a 10-30
> > second database query. The slow web request isn't gonna stall any
> > other web traffic as haproxy won't send any additional traffic to that
> > webserver instance until that request either times out or is
> > fulfilled.
> >
> > In addition for those cases when you have bursts of traffic that
> > temporarily overwhelm your backend, Haproxy queues those overflow
> > connections on the front end and then drains them off to the backend
> > mongrels in the most efficient and expedient manner. (So the end user
> > experience is the best).
> >
> > That all said, I still run with nginx in front of haproxy to intercept
> > statics, and do SSL offload.
> >
> > Cheers,
> > Brian
> >
> > P.S. - It all really depends. You might want to start with just
> > haproxy, if it is a small internal site, but if you plan to see any
> > level of internet scale traffic, you are really gonna want to add
> > haproxy into the mix.
> >
> >>
> >> Patrick
> >>
> >> On Mon, Jul 28, 2008 at 2:21 PM, Redd Vinylene <reddvinylene at gmail.com>
> >> wrote:
> >>>
> >>> Hi there!
> >>>
> >>> I'm working on my first HAProxy, NGINX and Rails setup, and I was
> >>> wondering if anybody could help me improve my configuration:
> >>>
> >>> http://pastie.org/242411
> >>>
> >>> I wish to keep things as simple as possible, but from what I hear, I'm
> >>> lacking quite a few "exciting" options ;)
> >>>
> >>> -- Redd Vinylene http://www.home.no/reddvinylene
> >>
> >>
> >
> >
> >
> > --
> > - Brian Gupta
> >
> > http://opensolaris.org/os/project/nycosug/
> >
> > http://www.genunix.org/wiki/index.php/OpenSolaris_New_User_FAQ
> >

-- 
Igor Sysoev
http://sysoev.ru/en/