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From Geoff Higginbottom <geoff.higginbot...@shapeblue.com>
Subject RE: CS 4.4.0 and XenServer 6.2. Stopping VM destroys it.
Date Mon, 06 Oct 2014 12:34:01 GMT
To clarify..

When XenServer is being used with CloudStack it behaves differently than a standalone XenServer.

When a VM is running, it is shown in XenCenter or when listed via XE commands etc.

However when you stop a VM, as far as XenServer is concerned it has been destroyed, with only
the Volumes left behind on Storage.

This may sound like a strange way of doing things but it makes sense when you consider that
when CloudStack starts a VM, it does all sorts of configuration as changes could have been
made whilst the VM is off such as:

Add or Remove NICs
Add or Remove Storage / IOS
Change CPU/RAM (via compute offering)
Change Affinity Groups

The Hypervisor which will run the VM is only chosen when the VM starts, so any Hypervisor
with access to the Shared Storage for the Cluster could start the VM.

Regards

Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

geoff.higginbottom@shapeblue.com

-----Original Message-----
From: Erik Weber [mailto:terbolous@gmail.com]
Sent: 06 October 2014 13:28
To: users@cloudstack.apache.org
Subject: Re: CS 4.4.0 and XenServer 6.2. Stopping VM destroys it.

On Mon, Oct 6, 2014 at 2:10 PM, Vadim Kimlaychuk <Vadim.Kimlaychuk@elion.ee>
wrote:

> Hello,
>
>             Have found very unplesent behaviour : when I execute „stop
> instance“ command Cloudstack actually destroys VM from hypervisor. No
> errors or other warnings has been issued.



AFAIK that is normal, you don't need the VM definition on the hypervisor, CloudStack will
recreate it when needed.


> Management log shows:
>
> 2014-10-06 14:55:37,365 DEBUG [c.c.a.t.Request]
> (Work-Job-Executor-70:ctx-ea29a5b5 job-158/job-159 ctx-65d35099) Seq
> 1-1867586470475218798: Sending  { Cmd , MgmtId: 90520745720479, via:
> 1(xcp1), Ver: v1, Flags: 100011,
> [{"com.cloud.agent.api.StopCommand":{"isProxy":false,"executeInSequenc
> e":false,"checkBeforeCleanup":false,"vmName":"i-2-13-VM","wait":0}}]
> }
> 2014-10-06 14:55:37,365 DEBUG [c.c.a.t.Request]
> (Work-Job-Executor-70:ctx-ea29a5b5 job-158/job-159 ctx-65d35099) Seq
> 1-1867586470475218798: Executing:  { Cmd , MgmtId: 90520745720479, via:
> 1(xcp1), Ver: v1, Flags: 100011,
> [{"com.cloud.agent.api.StopCommand":{"isProxy":false,"executeInSequenc
> e":false,"checkBeforeCleanup":false,"vmName":"i-2-13-VM","wait":0}}]
> }
>
> ……
>
> Then shortly after that:
> 2014-10-06 14:56:24,867 DEBUG [c.c.h.x.r.CitrixResourceBase]
> (DirectAgent-282:ctx-29a6d080) 10. The VM i-2-13-VM is in Stopped
> state
>
> But when I go to XEN dom0 and run „xe vm-list“ there is no VM anymore.
> And I can’t obviously start it again. Shows error “Job failed due to
> exception Unable to create a deployment for VM[User|i-2-13-VM]“
>

Could you get more log output as to why it fails to create a deployment?
Best is to tail the log 1 second before you hit launch, and paste the log content on pastebin
after the exception occurs.


--
Erik
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