[ovirt-users] Manually starting VMs via vdsClient (HE offline)

[Doug Ingham]

Hi Dan,

On 8 February 2017 at 18:10, Dan Yasny <dyasny at gmail.com> wrote:

>
>
> On Wed, Feb 8, 2017 at 4:07 PM, Doug Ingham <dougti at gmail.com> wrote:
>
>> Hi Guys,
>>  My Hosted-Engine has failed & it looks like the easiest solution will be
>> to install a new one. Now before I try to re-add the old hosts (still
>> running the guest VMs) & import the storage domain into the new engine, in
>> case things don't go to plan, I want to make sure I'm able to bring up the
>> guests on the hosts manually.
>>
>> The problem is vdsClient is giving me an "Unexpected exception", without
>> much more info as to why it's failing.
>>
>> Any idea?
>>
>> [root at v0 ~]# vdsClient -s 0 list table | grep georep
>> 9d1c3fef-498e-4c20-b124-01364d4d45a8  30455  georep-proxy         Down
>>
>> [root at v0 ~]# vdsClient -s 0 continue 9d1c3fef-498e-4c20-b124-01364d4d45a8
>> Unexpected exception
>>
>> /var/log/vdsm/vdsm.log
>> periodic/1063::WARNING::2017-02-08 17:57:52,532::periodic::276::v
>> irt.periodic.VmDispatcher::(__call__) could not run <class
>> 'vdsm.virt.periodic.DriveWatermarkMonitor'> on
>> ['65c9807c-7216-40b3-927c-5fd93bbd42ba', u'9d1c3fef-498e-4c20-b124-0136
>> 4d4d45a8']
>>
>>
> continue meane un-pause, not "start from a stopped state"
>

I search the manual for start/init/resume syntax, and "continue" was the
closest thing I found.


> now having said that, if you expect the VMs not to be able to start after
> you rebuild the engine and the VMs exist on the hosts, I'd collect a virsh
> -r dumpxml VMNAME for each - that way you have the disks in use, and all
> the VM configuration in a file, and with some minor LVM manipulation you'll
> be able to start the VM via virsh
>

My main concern is that I might have to halt the VMs or VDSM services for
some reason when trying to migrate to the new engine. I just want to make
sure that no matter what happens, I can still get the VMs back online.

I'm still getting myself acquainted with virsh/vdsClient. Could you provide
any insight into what I'd have to do to restart the guests manually?

Thanks,
-- 
Doug
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