Fwd: varnish 2.0.4 backend errors

Kristian Lyngstol kristian at redpill-linpro.com
Wed Jul 15 11:48:20 CEST 2009

On Wed, Jul 15, 2009 at 10:01:08AM +0200, Lazy wrote:
> setting 500 as min threads didn't make any diference, funny thing is
> that failed requests are in logged in apache as succesful

Sorry if I didn't make myself clear: The output from varnishstat didn't
indicate that threads was the issue causing 503s. It was more of a
tuning-comment than a shot at solving the real problem. Sorry about the

> 09:23:50.563934 IP x.x.x.x.51235 > x.x.x.x.88: S
> 1066103134:1066103134(0) win 32792 <mss 16396,sackOK,timestamp
> 552835403 0,nop,wscale 7>


Is it possible for you to mail me the raw cap-file? (Feel free to obfuscate
the IPs, but I'm really more of an ethereal-man than tcpdump-output...).
Feel free to drop it directly to me, if that makes it easier. 

> successful POST in apache logs,
> in varnishlog
> 14 Backend      c 15 default default


The request must've started earlier, as this is just the backend request.
Do you have the entire transaction available? 


> restart shouldn't make another backend connection if current one got closed ?

It should, but it should be noted that: 1. We don't know _why_ it fails. 2.
Restart in vcl_error is brand new, so there might still be some issues.

You could try to turn on vcl-trace. (-p vcl_trace=on).

Also, could you post your VCL in it's entirety? (If you already did, I
must've missed it.)

Kristian Lyngstøl
Redpill Linpro AS
Tlf: +47 21544179
Mob: +47 99014497
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