Re: [libvirt] suggestions on snapshotting testing

>> http://libvirt.org/formatsnapshot.html > > That page is live based on libvirt.git, and should be up-to-date with > the current implementation; although I would welcome improvements for > additional things to mention. I'd probably like to add some examples there for each different variant of snapshots just to give a practical idea for people referring that page. I'll try to do this over the weekend. You mentioned this page is live based on libvirt.git. Can I manually edit the examples section? Just ensuring I'm not messing up around.

> > Do you have specific scenarios in mind? Propose a problem that you > think a snapshot would help, then ask questions on which APIs you would > use to solve that problem. Nothing specific in mind. Let me see if I can provide a bit more info. I'm testing snapshots in the context of working with FreeIPA project, where I have a test set-up w/ multiple guests, with subtle env. changes in them, interacting w/ each other. I need keep track of a clean state, a state with a particular env set-up, revert to a certain state, etc, often ending up with a tree of (internal)snapshots for each guest. I'm just exploring what kind of snapshots are most efficient for these scenarios.

> > Do you understand the difference between the various snapshot flavors? > There's several orthogonal issues to be aware of, although not all > combinations are supported. I think I do understand to a certain extent. I previously had a discussion with you when I initially started off and captured the notes as a blog post -- http://kashyapc.wordpress.com/2011/10/04/snapshotting-with-libvirt-for-qc... However, thanks for the nice summary below.

> I'll post more when I have a bit more clarity and more specifics on what I'd like to try. I'm a little hazy with the external snapshots as the combinations/tree of snapshots can get a bit complex . Though I do use the basic operation in my daily work flow, like: ===================== root@~$ virsh list Id Name State ---------------------------------------------------- 11 f17test running root@~$ ===================== root@~$ virsh domblklist f17test --details Type Device Target Source ------------------------------------------------ file disk vda /var/lib/libvirt/images/f17test.qcow2 root@~$ ===================== root@~$ virsh snapshot-create-as f17test cleanf17 cleanf17-box --diskspec vda,file=/var/lib/libvirt/images/snap-f17test.qcow2 --disk-only Domain snapshot cleanf17 created root@~$ ===================== root@~$ virsh snapshot-list f17test Name Creation Time State ------------------------------------------------------------ cleanf17 2012-05-14 00:02:54 +0530 disk-snapshot root@~$ ===================== Thanks for your response.