Re: [libvirt-users] Blockpull while domain is shutoff
On Wed, Jul 03, 2019 at 14:07:10 -0400, Roger Jin wrote:
Hi Libvirt,
Is there a command that performs the same operation as blockpull while a
domain is shutoff? I have a backing chain
base <-- A <-- B
that I would like to shorten to
base <-- B
Generally we refer as 'base' to the image which has overlays, so you are
here describing a 'commit' operation. Which image is the topmost overlay
used by the vm?
It seems like blockpull B, setting --base <path-to-base> does
this, but
only when the domain is running.
Libvirt currently does not implement these operations while the VM is
shutoff because the difference of interactions beween qemu and qemu-img.
As a workaround, you can either do the pull via qemu-img manually, or
start the vm in paused mode (virsh start --paused), then do the
blockpull and then 'virsh destroy' the VM. The filesystems would be
never touched so 'destroy' should be safe in this case.
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