Varnish 2.1 - Error 503 during Logrotate

[Stephen Wood]

Varnish may be marking your backend as "unhealthy" because you're failing
too many health probes during this phase. When Varnish does backend health
polling, it opens a *new* tcp connection to the backend with a
preconfigured request.

I would increase the timeout, window, and/or threshold to see if you can
rule this out. You can read more about backend polling
here<https://www.varnish-cache.org/trac/wiki/BackendPolling>
.


On Sun, Feb 10, 2013 at 6:35 AM, Tristan CHARBONNIER @ Crealya <
charbonnier at crealya.com> wrote:

> Hello,****
>
> ** **
>
> First, I want to thanks everyone who is contributing to this great piece
> of software! Indeed, it’s working very well and it’s very efficient.****
>
> ** **
>
> I just encounter a small problem : I use varnish/squeeze v2.1.3-8 on a
> Debian Linux 6.0 web server with the kernel v2.6.32-5-amd64.****
>
> I use Virtualmin to manage this webserver and I set up Varnish on top of
> apache2/squeeze v2.2.16-6+squeeze10.****
>
> ** **
>
> During the logrotate process, Varnish gives 503 errors. I traced the
> problem to the multiple apache2 graceful restart that are done during this
> process.****
>
> Indeed, I host plenty of websites (more than 100) on my web server and,
> for each one, I have a block like this in my ‘/etc/logrotate.conf’ file:**
> **
>
> ** **
>
> /var/log/virtualmin/mywebsite.fr_access_log
> /var/log/virtualmin/mywebsite.fr_error_log {****
>
>         rotate 5****
>
>         weekly****
>
>         compress****
>
>         postrotate****
>
>         /usr/sbin/apache2ctl graceful ; sleep 5****
>
>         endscript****
>
> }****
>
> ** **
>
> So, during the logrotate process (which lasts for 20 minutes), there is
> 100+ graceful restart of apache. ‘graceful restart’ are not supposed to
> terminate existing connections so I don’t understand why Varnish fails to
> work: probably a mistake on my side!****
>
> ** **
>
> In my VCL file, I just have “backend apache { .host = "88.190.19.00";
> .port = "8080"; }” block along with the usual ones (acl purge, vcl_fetch,
> …). I use the default Varnish configuration file, except that I raised the
> memory to 4G and use ram to store the cache.****
>
> ** **
>
> Any clue on how I can solve this small problem?****
>
> ** **
>
> Thanks in advance,****
>
> ** **
>
> Tristan CHARBONNIER****
>
> ** **
>
> ** **
>
> _______________________________________________
> varnish-misc mailing list
> varnish-misc at varnish-cache.org
> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
>
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