/var/lib/varnish tmpfs recommended size and multiple _.vsm files

[Dag Haavi Finstad]

Hi

The situation is that some of the tools keep the old VSM file open
(varnishlog, varnishncsa, ...) which will prevent it from getting
cleaned up prior to Varnish creating a new one.

Sizing the tmpfs to fit two full VSM files should do the trick (at least ~170M).

Regards,
Dag

On Wed, May 27, 2015 at 11:54 PM, Richard Guest <R.Guest at gns.cri.nz> wrote:
> Hi,
>
> I'm afraid I can't help here, but I would like to pipe up and say that I
> have
> noticed this behaviour on some of our varnish hosts also.
>
> If someone more intimately familiar with the relevant code could chime in
> and
> shed some light on this, then I'm sure we could figure out a sane number
> fairly quickly.
>
> My best guess (and I stress guess here, because I've done literally zero
> investigation) is it's related to a client still reading from the SHM log,
> so
> it's politely moved to one side, rather than just being destroyed.
> Does that sound plausible? Anyone...?
>
> Cheers,
> Rich
>
>> Hi,
>>
>> Any suggestions on size of /var/lib/varnish while mounted as tmpfs? We
>> only have one instance, therefore we thought it would be enough to set
>> it slightly bigger than 82MB, but while restarting Varnish, some other
>> shmlog file named _.vsm.4311 got created and Varnish failed to start
>> because of full disk. Therefore we could not be sure about size of
>> tmpfs.
>>
>> Thanks
>>
>> On Mon, May 25, 2015 at 6:12 PM, Web Teknik <webteknik.tcmb at gmail.com>
>> wrote:
>> > Hi,
>> >
>> > After reading Varnish Book and Varnish wiki, we decided to put
>> > /var/lib/varnish directory to tmpfs with following line in /etc/fstab
>> >
>> > tmpfs                   /var/lib/varnish        tmpfs
>> > defaults,noatime,size=128M        0 0
>> >
>> >
>> > However, while trying restarting varnish, another shmlog file which is
>> > named _.vsm.4311 is also stored under /var/lib/varnish/<host> whose
>> > size is 42MB. As a result Varnish refused to start since disk is full.
>> > We couldn't reproduce the issue that _.vsm.somenumber (PID?) is
>> > created. Under which conditions multiple _.vsm files are created and
>> > in order to prevent failure, what is the recommended size for
>> > /var/lib/varnish directory?
>> >
>> > Thanks in advance.
>
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Dag Haavi Finstad
Software Developer | Varnish Software
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