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Re: [Qemu-devel] [libvirt] Question regarding Snapshots

From: Kashyap Chamarthy
Subject: Re: [Qemu-devel] [libvirt] Question regarding Snapshots
Date: Mon, 27 Feb 2017 14:17:57 +0100
User-agent: Mutt/ (2016-04-01)

On Mon, Feb 27, 2017 at 01:33:56PM +0100, Kashyap Chamarthy wrote:


> > > Can you make a snapshot, then go back to the base and ignore that snapshot
> > > like a closed branch, make another snapshot, and then go back and forth
> > > from each to each?
> If you edit the '--disk' element as above and point to the right
> 'snapshot', you should be able to switch between several of them.


> And conveniently, you can tell libvirt to not track the metadata:
>   $ virsh snapshot-create-as --domain vm1 guest-state1 \
>       --diskspec vda,file=/export/overlay1.qcow2 \
>       --disk-only --atomic --no-metadata
> This way, libvirt will not track 'overlay1.qcow2'.  But if you do need
> it, as you know, just update the 

Err, unfinished sentence there.  Meant to write: just update the
'source file' attribute in the guest XML, pointing to the said disk.

> For the long answer to the complications involved in reverting to
> external snapshots, refer this (long read):
> https://wiki.libvirt.org/page/I_created_an_external_snapshot,_but_libvirt_will_not_let_me_delete_or_revert_to_it



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