Re: LIbvirt Python Snapshot -Domain Crashing

[Sijo Jose <mailtosijojose@xxxxxxxxx>]

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@xxxxxxxxxx> 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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