re: multi server failover setup

re: multi server failover setup

[Dylan Stamat]

Eric, have you heard of anybody using the idea you laid out here?
http://article.gmane.org/gmane.comp.lang.ruby.unicorn.general/31

I really like the approach, and hoping I'm not going to be the first  
one trying it ;)

I noticed that Mr. Wanstrath is using UDS in his deployment here:  http://github.com/blog/517-unicorn
Wondering if they're running with the same or similar strategy as your  
suggestion?

Our application is long-running-request heavy, so we may actually be a  
Rainbows! candidate.

Thanks!
==
Dylan

Re: multi server failover setup

[Chris Wanstrath]

On Mon, Oct 26, 2009 at 12:34 PM, Dylan Stamat <dstamat@elctech.com> wrote:

> I noticed that Mr. Wanstrath is using UDS in his deployment here:
>  http://github.com/blog/517-unicorn
> Wondering if they're running with the same or similar strategy as your
> suggestion?

We're currently not using this strategy. Perhaps in the future, but
currently we're still trying to completely isolate the various
services within our app - when nginx or Unicorn chokes presently, they
all do. Once that's fixed we'll begin looking into this or something
similar.

-- 
Chris Wanstrath
http://github.com/defunkt

Re: multi server failover setup

[Eric Wong]

Chris Wanstrath <chris@ozmm.org> wrote:
> On Mon, Oct 26, 2009 at 12:34 PM, Dylan Stamat <dstamat@elctech.com> wrote:
> > I noticed that Mr. Wanstrath is using UDS in his deployment here:
> >  http://github.com/blog/517-unicorn
> > Wondering if they're running with the same or similar strategy as your
> > suggestion?
> 
> We're currently not using this strategy. Perhaps in the future, but
> currently we're still trying to completely isolate the various
> services within our app - when nginx or Unicorn chokes presently, they
> all do. Once that's fixed we'll begin looking into this or something
> similar.

By Unicorn choking you mean something in your app chokes, right? :)
Is this something adding fail_timeout=0 in nginx can fix/workaround?

Not sure where nginx itself would choke besides uncached disk reads
or somehow writing a lot of logs.

That said I myself haven't gotten a chance to test that setup I proposed
for a while (except the nginx fail_timeout=0 part, I've gotten folks
running with that for ages now).

-- 
Eric Wong

Re: multi server failover setup

[Chris Wanstrath]

On Mon, Oct 26, 2009 at 2:42 PM, Eric Wong <normalperson@yhbt.net> wrote:

>> We're currently not using this strategy. Perhaps in the future, but
>> currently we're still trying to completely isolate the various
>> services within our app - when nginx or Unicorn chokes presently, they
>> all do. Once that's fixed we'll begin looking into this or something
>> similar.
>
> By Unicorn choking you mean something in your app chokes, right? :)
> Is this something adding fail_timeout=0 in nginx can fix/workaround?

Yes, our app itself. Unicorn has been amazingly solid for us, as has nginx.

We've added fail_timeout=0 into our config as per your suggestion and
it's helped a lot. Still doesn't fix bugs in our app code though :)

-- 
Chris Wanstrath
http://github.com/defunkt