varnish suddenly restarting / flushing itself after several hours?

Frank van Lingen frank at
Sun Jan 10 13:05:43 CET 2010

Thanks David,

I do monitor the memory and cpu load but there seem to be no apparent
increase when this happens.

I should point out that I run this in on a hosted VPS but I am well
below their memory and cpu requirements.

Varnish does restart itself gracefully when this happens. I guess if
prefetching would be available in Varnish (from the information on the
varnish site I understood this is not yet available), this might
alleviate the problem except that for 2-3 seconds the site is
unreachable when it restarts itself (or when the child process is


On Sun, Jan 10, 2010 at 5:00 AM, David Birdsong
<david.birdsong at> wrote:
> The parent will restart the child if it becomes unresponsive to pings. This
> can happen for multiple reasons.  Do you have historical metrics for the
> server that you can examine to see if load goes up or idle cpu goes down or
> if memory is consumed?
> (Sorry for the top post, friggin mobile device)
> On Jan 9, 2010 5:34 AM, "Frank van Lingen" <frank at> wrote:
> Hello,
> After setting up varnish and starting it I looked at the statistics
> using varnsihstat. The timer in the left uppper corner seems to be the
> uptime since it last started or was flushed. When I loaded some pages,
> I can see the cache is working
> But I notice that once every so often the cache seems to either flush
> itself or restart. During this 2-3 seconds that this happens I can not
> load any pages.
> Is there a default 'cash flush' value that makes this (for me
> undesirable) behavior happen?
> I added the example described in
> to my
> vcl file, but if the cash flushes itself a couple of times per day
> then it defeats the purpose.
> I am using varnish-2.0.5-1.el5 on centos5 and use the default.vcl file
> with the above longer caching example added to it and ignore swf and
> pdf files. I start varnish with 40 MB of cache and test this with a
> few html pages and jpgs (less then 15 MB in size). During tests
> normally not more than 50% of the cache is used.
> Besides this issue varnish seems to work almost right out of the box.
> Frank.
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