varnish backing file gone missing

[Mit Rowe]

Speaking as a sysadmin:

That cron job is a pretty standard thing; /tmp is expected to be volatile
and i many operating systems (FreeBSD, Ubuntu, Debian) ship with a default
cron job that cleans it up, although at least in the case of FreeBSD it has
the ability to add an 'exclusion' list.

To avoid issues, I usually use /var/run/ for sockets and such.

-Mit


On Mon, Sep 26, 2011 at 9:32 PM, Matt Schurenko <MSchurenko at airg.com> wrote:

> Thanks for the help. It looks like the previous sys admin had  a cron job
> that deleted everything in /tmp.
>
> Sent from my iPhone
>
> On 2011-09-26, at 3:52 PM, "Mark Moseley" <moseleymark at gmail.com> wrote:
>
> > On Mon, Sep 26, 2011 at 3:37 PM, Matt Schurenko <MSchurenko at airg.com>
> wrote:
> >> Yeah it says "deleted" when I use lsof. Is this going to cause a problem
> eventually? Since the file is gone is the kernel just using RAM alone now?
> Swap usage hasn't increased. I'm wondering how it is continuing to function.
> >
> >> -----Original Message-----
> >> From: varnish-misc-bounces at varnish-cache.org [mailto:
> varnish-misc-bounces at varnish-cache.org] On Behalf Of Mark Moseley
> >> Sent: September-26-11 1:00 PM
> >> Cc: varnish-misc at varnish-cache.org
> >> Subject: Re: varnish backing file gone missing
> >>
> >> On Mon, Sep 26, 2011 at 12:54 PM, Matt Schurenko <MSchurenko at airg.com>
> wrote:
> >>> Update:
> >>>
> >>>
> >>>
> >>> I noticed that I mistakenly created a 40GB  zero-filled file rather
> than a
> >>> 48GB one:
> >>>
> >>>
> >>>
> >>> dd if=/dev/zero of=/tmp/varnish-cache bs=1G count=40
> >>>
> >>>
> >>>
> >>> Not sure if that would make any difference.
> >>>
> >>>
> >>>
> >>> Matt Schurenko
> >>> Systems Administrator
> >>>
> >>>
> >>> airG® Share Your World
> >>> Suite 710, 1133 Melville Street
> >>>
> >>> Vancouver, BC  V6E 4E5
> >>>
> >>> P: +1.604.408.2228
> >>>
> >>> F: +1.866.874.8136
> >>>
> >>> E: MSchurenko at airg.com
> >>>
> >>> W: www.airg.com
> >>>
> >>> From: varnish-misc-bounces at varnish-cache.org
> >>> [mailto:varnish-misc-bounces at varnish-cache.org] On Behalf Of Matt
> Schurenko
> >>> Sent: September-26-11 12:43 PM
> >>> To: varnish-misc at varnish-cache.org
> >>> Subject: varnish backing file gone missing
> >>>
> >>>
> >>>
> >>> I just noticed that the backing file I configured varnish to use is now
> >>> gone:
> >>>
> >>>
> >>>
> >>> [root at mvp13 ~]# ps -ef | grep varnishd
> >>>
> >>> root      4419     1  0 Sep07 ?        00:00:00
> /usr/local/sbin/varnishd -s
> >>> file,/tmp/varnish-cache,48G -T 127.0.0.1:2000 -a 0.0.0.0:80 -t 604800
> -f
> >>> /usr/local/etc/varnish/default.vcl -p http_headers 384 -p
> connect_timeout
> >>> 4.0
> >>>
> >>>
> >>>
> >>> [root at mvp13 ~]# ls /tmp/varnish-cache
> >>>
> >>> ls: /tmp/varnish-cache: No such file or directory
> >>>
> >>>
> >>>
> >>> If I do an lsof I see this:
> >>>
> >>>
> >>>
> >>> varnishd   4420 nobody    4u      REG                8,1 51539607552
> >>> 62160904 /tmp/varnish-cache (deleted)
> >>>
> >>>
> >>>
> >>> I'm pretty sure I never deleted it. Is this normal behaviour? What are
> the
> >>> implications of this file being removed while varnish is running?
> Varnishd
> >>> still appears to be working fine. I have another varnish server running
> but
> >>> the backing file is still there. BTW I'm running varnish version 2.1.5.
> >>>
> >>>
> >>>
> >>
> >> Perhaps a log rotation script deleted it? If so and varnishd is still
> >> running, it should show up in lsof with "(deleted)" next to the
> >> pathname.
> >
> > It'll work as long as varnishd has it open. It'll only get released
> > when varnished closes it. I'd suggest moving to something like
> > /var/{lib,cache,run}/varnish
> >
> > _______________________________________________
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> > varnish-misc at varnish-cache.org
> > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
> _______________________________________________
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>



-- 
Will 'Mit' Rowe
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