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Re: Does any module support the heathy check of the backend upstreams?

June 10, 2009 05:58PM
On Wed, Jun 10, 2009 at 2:45 PM, merlin corey<merlincorey@dc949.org> wrote:
> How often do you really expect servers to go up and down?  I think you
> are correct, though, HUP can take a bit of time/resources.  My point
> is, are you really having upstreams die constantly?  Seems like you
> would have much worse problems than what it takes to HUP at that
> point...

In an infrastructure with 10's or 100's of servers, in theory you
could have one going up and down anytime.

Look at Amazon's whitepaper about Dynamo or how Google addresses the
whole "commodity" issue. Things will go up and down at anytime, and
you should gracefully handle it. nginx is almost capable of gracefully
doing it (mid-transfer I don't think it would unless the client
re-issued the request with a range offset) but with the
try-next-upstream approach it gracefully handles that already...

I'm looking to have a solution in place which can scale and is "set it
and forget it" - a HUP may be a lot of work, especially if nginx is
being the frontend for so many connections/servers. I don't know. I
guess Igor/Maxim would be the most knowledgeable about what exactly a
HUP will do to all of that...
Subject Author Posted

Does any module support the heathy check of the backend upstreams?

Chieu May 31, 2009 06:56AM

Re: Does any module support the heathy check of the backend upstreams?

mingjiang huang June 08, 2009 05:25AM

Re: Does any module support the heathy check of the backend upstreams?

mike June 08, 2009 04:12PM

Re: Does any module support the heathy check of the backend upstreams?

Avleen Vig June 09, 2009 07:01AM

Re: Does any module support the heathy check of the backend upstreams?

mike June 09, 2009 01:13PM

Re: Does any module support the heathy check of the backend upstreams?

merlin corey June 10, 2009 05:21PM

Re: Does any module support the heathy check of the backend upstreams?

mike June 10, 2009 05:28PM

Re: Does any module support the heathy check of the backend upstreams?

merlin corey June 10, 2009 05:45PM

Re: Does any module support the heathy check of the backend upstreams?

mike June 10, 2009 05:58PM

Re: Does any module support the heathy check of the backend upstreams?

Chieu June 10, 2009 11:41PM



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