A couple varnish 2.1 questions...

[Bedis 9]

Hi,

You might need beresp.grace in the vcl_fetch.
otherwise the objetcs won't be server if backend is unavailable.

set beresp.grace = 1h;

rgs


On Tue, Apr 27, 2010 at 6:54 PM, Darron Froese <darron at nonfiction.ca> wrote:
> I have a Rackspace Cloud server running Ubuntu 9.10 (1GB of RAM,
> Quad-Core AMD Opteron Processor 2374 HE, I believe it's 64bit)
> specifically JUST to run Varnish for a festival website. It's fast
> enough for most of the year, but for about 3 weeks it gets pretty
> loaded and I want to make sure that the site survives without issues
> this year. It's mostly static information so pretty easy to cache.
>
> Varnish 2.1 is compiled from this dsc file:
>
> http://archive.ubuntu.com/ubuntu/pool/universe/v/varnish/varnish_2.1.0-2.dsc
>
> I have 2 questions:
>
> 1. I know that I'm doing something wrong with my vcl file - what I want is this:
>
> 5 minute TTL for all content (regardless of headers) - as long as the
> backend is healthy
> 1 hour TTL for all content if the backend is sick (500 error, not
> responding, etc)
>
> I've tried what's referenced here:
>
> http://varnish-cache.org/wiki/VCLExampleGrace
> http://varnish-cache.org/wiki/BackendPolling
>
> And it didn't seem to work - some content gave out a 50x error RIGHT
> away when I took the test backend down and other content worked for 5
> minutes and then gave 50x errors.
>
> Here was that vcl:
>
> http://gist.github.com/380966
>
> Here's my current vcl (with hostnames obscured sorry):
>
> http://gist.github.com/380942
>
> I know it's wrong - can somebody point out what I'm missing? I've
> messed with it for a while now and just can't seem to get it to do
> what I want.
>
> 2. I stress tested that server overnight hit 479M pageviews which will
> be much higher than I need - I basically ran these two commands in a
> loop:
>
> ab -n 10000 -c 100 http://varnish.nonfiction.ca/
> wget -q -A *.html -r http://varnish.nonfiction.ca/
>
> NOTE: High levels of single page traffic on this site, it exists to
> serve out lots of homepage traffic and very low levels of anything
> else. All external images/CSS and JS files will be served via CDN.
>
> Varnishstat at the end of the run: http://drp.ly/TEvcv
> Here's the munin details: http://drp.ly/TEzd0
>
> My only concern is the amount of committed memory - should it be
> rising that high?
>
> After I killed varnish - the committed memory went back down:
> http://drp.ly/TFtdx
>
> Do I need to put a manual restart of Varnish into my crontab to free that up?
>
> Any responses/links/etc. would be great - thanks.
>
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