[libvirt-users] LIbvirt Python Snapshot -Domain Crashing

[Sijo Jose]

Martin,
Actually domain doesn't crash, but it state got changed to pause, till the
snapshot action got complete.
Its a time consuming process.

so here is my requirement.

I want to take snapshot of a Running Domain on every 3 hours,( at a later
point of time It should be possible to revert to the actual domain state
when I took the snapshot), I'm using libvirt APIs python bindings,
there are many  flags defined, so which way I can accomplish it..?
as of now I"m using flag value as zero.



API Call
--------------
snp1=domain1.snapshotCreateXML(snp_xml,0)


virDomainSnapshotCreateFlags

enum virDomainSnapshotCreateFlags {

VIR_DOMAIN_SNAPSHOT_CREATE_REDEFINE = 1
Restore or alter metadata
VIR_DOMAIN_SNAPSHOT_CREATE_CURRENT = 2
With redefine, make snapshot current
VIR_DOMAIN_SNAPSHOT_CREATE_NO_METADATA = 4
Make snapshot without remembering it
VIR_DOMAIN_SNAPSHOT_CREATE_HALT = 8
Stop running guest after snapshot
VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY = 16
disk snapshot, not system checkpoint
VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT = 32
reuse any existing external files
VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE = 64
use guest agent to quiesce all mounted file systems within the domain
VIR_DOMAIN_SNAPSHOT_CREATE_ATOMIC = 128
atomically avoid partial changes
VIR_DOMAIN_SNAPSHOT_CREATE_LIVE = 256
create the snapshot while the guest is running

-Sijo


On Tue, Jun 3, 2014 at 6:00 PM, Martin Kletzander <mkletzan at redhat.com>
wrote:

> On Tue, Jun 03, 2014 at 04:02:21PM +0530, Sijo Jose wrote:
>
>> Hi,
>> I'm using libvirt(1.0.0) with python, for managing virtual machines..
>> but while taking multiple snapshot domain is crashing...
>>
>> Snapshot XML
>> -------------------------
>>
>> <domainsnapshot>
>>  <name>snp1</name>
>>  <creationTime></creationTime>
>>  <description>Description</description>
>>  <state></state>
>>  <domain>
>>     <uuid></uuid>
>>  </domain>
>>  <parent>
>>    <name></name>
>>  </parent>
>>
>> </domainsnapshot>
>> ----------------
>>
>>
>> API Call
>> --------------
>> snp1=domain1.snapshotCreateXML(snp_xml,0)
>> here I'm passing flag value as zero..
>>
>> Its created first snapshot without any error, but when I tried for second
>> snapshot
>> 1) Domain switched its state to pause and its not coming back
>>
>>
>> I installed ubuntu12.04 OS in the domian.
>>
>>
> I do not know much about these snapshot calls, but let me ask you.
> You wrote that it's crashing, but here you are saying it gets paused
> only, so which statement is correct?
>
> If you have the problem with "downstream" version (here you are saying
> it's from Ubuntu), please check it with current master as well.  That
> can help us (or someone from Ubuntu) find the reason for it to fail.
> It's also possible there are some patches applied only in your
> downstream version on top of 1.0.0 and we're mostly dealing with
> upstream versions here.
>
> Martin
>
>  Rgds
>> -Sijo
>>
>
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>>
>
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