Varnish crashing in production

[Ask Bjørn Hansen]

On May 10, 2007, at 7:31 PM, Barry Abrahamson wrote:

> We are currently testing Varnish as a reverse proxy to serve  
> images.  We are running into problems where the varnishd child (and  
> sometimes parent), will die unexpectedly.

FWIW I am seeing something similar.  I haven't seen anything in the  
syslog or tried running varnishlog for long enough to catch it  
happening (which I why I didn't post).  In this installation (on  
RHEL4) increasing the cache size did seem to help on the frequency.

It never happens when it's idle-ish (<100-150 rps) but in the busy  
hours (2-500rps) it happens frequently.   In the cache hit ratio (I  
love munin!) you can see that pretty clearly - stable or slowly  
increasing average ratio during the off-peak hours - when it's busy  
it drops every time there's a crash...

	http://tmp.askask.com/2007/05/varnish_cachehitratio-day.png


  - ask

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