[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: KVM NFS template image

Hi Andrija,

Thanks for the clarification and quick response


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)

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

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?


On Fri, 16 Nov 2018 at 22:38, ran huang <ran.huang134@xxxxxxxxx> 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?

CS ver 4.9.2 on CentOS 7.2