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From ran huang <ran.huang...@gmail.com>
Subject Re: KVM NFS template image
Date Thu, 22 Nov 2018 20:18:04 GMT
Thanks Andrija, just tested myself with expunge and works as expected.

However, for KVM, when I revert a qcow disk from snapshot, which removes 
the backing chain to template, the template will not be removed.

So it seems like despite the qcow disk is no longer backed by the 
template, the template will still consider the disk as its children in 
this case(revert from snapshot).

regards,
Ran

On 11/19/2018 10:43 AM, Andrija Panic wrote:
> new template, deployed new VM, destroyed VM (with Exunge option)...
>
> up to 120sec later... (storage.cleanup.interval=120 sec,  global config
> option)
>
> 2018-11-19 19:35:59,525 DEBUGStorage pool garbage collector found 1
> templates to clean up in storage pool: Primary-storage - NFS
> 2018-11-19 19:35:59,525 DEBUG [c.c.s.StorageManagerImpl]
> (StorageManager-Scavenger-1:ctx-2c88c8e0) (logid:040f4ad1) Storage pool
> garbage collector has marked template with ID: 219 on pool 4 for garbage
> collection
>
> Another  120sec later... (storage.cleanup.delay=120sec)
>
> 2018-11-19 19:37:59,598 DEBUG [c.c.s.StorageManagerImpl]
> (StorageManager-Scavenger-2:ctx-f9dd338d) (logid:9ae40975) Storage pool
> garbage collector found 1 templates to clean up in storage pool:
> Primary-storage - NFS
> ...
> 2018-11-19 19:37:59,638 DEBUG [c.c.t.TemplateManagerImpl]
> (StorageManager-Scavenger-2:ctx-f9dd338d) (logid:9ae40975) Evicting
> TmplPool[37-219-4-563ea0f5-5164-4ac4-a183-728f418269b7]
> 2018-11-19 19:37:59,643 DEBUG [c.c.h.o.r.Ovm3HypervisorGuru]
> (StorageManager-Scavenger-2:ctx-f9dd338d) (logid:9ae40975)
> getCommandHostDelegation: class com.cloud.agent.api.storage.DestroyCommand
> ...
> 2018-11-19 19:37:59,665 DEBUG [c.c.t.TemplateManagerImpl]
> (StorageManager-Scavenger-2:ctx-f9dd338d) (logid:9ae40975) Successfully
> evicted template andrija-test-tmpl from storage pool null
>
> template "andrija-test-tmpl" deleted...
>
> Hope that helps Run.
>
> Cheers
> Andrija
>
> On Mon, 19 Nov 2018 at 19:11, Andrija Panic <andrija.panic@gmail.com> wrote:
>
>> True (at least I'm sure for SolidFire) - but I believe in general also
>> (will test this now...)
>>
>> On Mon, 19 Nov 2018 at 18:51, Dag Sonstebo <Dag.Sonstebo@shapeblue.com>
>> wrote:
>>
>>> Developers please correct me... but as far as I remember there is a
>>> garbage collector which does remove the templates from primary storage once
>>> they are not needed (i.e. have no more "child VMs"). This is controlled by
>>> the global setting "storage.template.cleanup.enabled".
>>>
>>> Regards,
>>> Dag Sonstebo
>>> Cloud Architect
>>> ShapeBlue
>>>
>>>
>>> On 16/11/2018, 22:51, "ran huang" <ran.huang134@gmail.com> wrote:
>>>
>>>      Hi Andrija,
>>>
>>>      Thanks for the clarification and quick response
>>>
>>>      regards,
>>>      Ran
>>>
>>>      On 11/16/2018 02:15 PM, Andrija Panic wrote:
>>>      > Hi Ran,
>>>      >
>>>      > templates stays on Primary Storage "forever", at least for NFS
>>> (they are
>>>      > moved from Secondary to Primary when you deploy a very first VM from
>>>      > specific template). All VMs have this templates qcow2 as baking
>>> (parent)
>>>      > image.
>>>      >
>>>      > This template is a qcow2 copy of a file from Secondary Storage -
>>> and is
>>>      > considered a "parent" image, from which all child images  (VM
>>> volumes) are
>>>      > created - as you stated baking file (qcow linked clones, in official
>>>      > terminology)
>>>      >
>>>      > you can have i.e. 100 VMs all linking (having it's backing file...)
>>> to a
>>>      > template qcow2 file.
>>>      > So in other words, it's not supposed to be removed.
>>>      >
>>>      > Does this make sense?
>>>      >
>>>      > Cheers
>>>      >
>>>      >
>>>      >
>>>
>>> Dag.Sonstebo@shapeblue.com
>>> www.shapeblue.com
>>> Amadeus House, Floral Street, London  WC2E 9DPUK
>>> @shapeblue
>>>
>>>
>>>
>>>> On Fri, 16 Nov 2018 at 22:38, ran huang <ran.huang134@gmail.com> wrote:
>>>      >
>>>      >> Greetings All,
>>>      >>
>>>      >> For qcow2 format images, when creating a new VM in KVM, the
>>> template
>>>      >> image is copied from secondary storage to primary storage, and
the
>>> root
>>>      >> volume image is created with the template image as a backing file.
>>>      >>
>>>      >> But when I break this backing chain on primary(expunge VM or
>>> revert to a
>>>      >> snapshot previously created on the root volume image), the template
>>>      >> image is not deleted.
>>>      >>
>>>      >> Might I ask how is the template image going to be cleaned from
the
>>>      >> primary storage?
>>>      >>
>>>      >>
>>>      >> addendum:
>>>      >> CS ver 4.9.2 on CentOS 7.2
>>>      >>
>>>      >> regards,
>>>      >> Ran
>>>      >>
>>>      >
>>>
>>>
>>>
>>>
>> --
>>
>> Andrija Panić
>>
>


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