[ovirt-users] Backup solution using the API

[Soeren Malchow]

Dear all,

i am a little lost, i tried quite a few things with the snapshots, so far with python scripts I can iterate through the existing machines, take one, make a snapshot and all this.

However, there are 2 problems I can not get around:

1. even when on 3.5.1 I can not delete a snapshot on a running VM, if I understood that correctly this relies on the Live Merge Feature where the code is available in vdsm already but it needs a certain libvirt version !?!?
So question here is, can I delete a snapshot or not ? can I use only the rest API not python  (excuse me I am not a developer)

2. when I attach a snapshot to another virtual machine, how do I do the backup then ? Does anybody have this already ?

The environment is running on CentOS 7 (hypervisors), Centos 6 (hosted engine), the ovirt is on version 3.5.1, also we use gluster as a storage backend where the gluster servers are managed within the hosted engine in a separate cluster exporting the storage only.

Regards
Soeren 


-----Original Message-----
From: users-bounces at ovirt.org [mailto:users-bounces at ovirt.org] On Behalf Of Adam Litke
Sent: Tuesday, January 6, 2015 5:04 PM
To: Nir Soffer
Cc: Thomas Keppler (PEBA); users at ovirt.org
Subject: Re: [ovirt-users] Backup solution using the API

On 15/12/14 04:31 -0500, Nir Soffer wrote:
>----- Original Message -----
>> From: "Blaster" <Blaster at 556nato.com>
>> To: "Thomas Keppler (PEBA)" <thomas.keppler at kit.edu>, users at ovirt.org
>> Sent: Wednesday, December 10, 2014 8:06:58 PM
>> Subject: Re: [ovirt-users] Backup solution using the API
>>
>> On 11/27/2014 9:12 AM, Keppler, Thomas (PEBA) wrote:
>>
>>
>>
>> Now, before I go into any more hassle, has somebody else of you done 
>> a live-backup solution for oVirt? Are there any recommendations? 
>> Thanks for any help provided!
>>
>>
>> I've been looking for a similar scheme for the last year. It was not 
>> (really) possible in the past as there wasn't any way to destroy a 
>> snapshot w/o shutting down the VM. Is this still the case, or are 
>> snap shots fully implemented now?
>>
>> Basically, I'd like to:
>> Tell VM to flush it's buffers
>> suspend VM
>> take snap shot of boot virtual disk
>> resume VM
>
>You don't need to suspend the vm, qemu can create live snapshot. When 
>the snapshot is done, you don't care about future io, it will simply 
>not included in the backup.
>
>> backup the virtual boot disk from the Hypervisor using standard 
>> commands (tar, cp, whatever)
>
>You can by attaching the snapshot to another vm
>
>> destroy the snapshot
>
>You can in ovirt 3.5.1 - we do not depend any more on future libvirt features.
>Adam, can you confirm?

Yes, on 3.5.1 you'll be able to destroy the snapshot without impacting the running VM.

>>
>> This would at least give some BMR capabilities of your VMs.
>>
>> Ideally, I'd also like to be able to create a snapshot from within 
>> the VM, do
>
>You can do this "within" the vm by using the engine REST API. But this 
>can be fragile - for example, if the vm pauses, your backup tool within 
>the vm will never complete :-)
>
>> a yum update, see if I like it or not, if I do, then destroy the snap shot.
>
>Possible in 3.5.1 using REST API
>
>> If I don't, I want to promote the snapshot and boot from that, then 
>> destroy the "original".
>
>Same
>
>Nir

--
Adam Litke
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