Open Stack

I want to do something similar soon and don't want to touch the db (I
experimented with cloning the "controller" and it did not achieve any
desired outcome).

Is there a way to export an instance from Openstack in terms of something
like a script that could re-create it on another openstack as a
like-for-like? I guess this is assuming that the instance is linux-based
and has cloud-init enabled.


*Tony Pearce*   |
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On Thu, 30 Jan 2020 at 16:39, Tobias Urdin <tobias.urdin at binero.se> wrote:

> We did this something similar recently, we booted all instances from
> Cinder volume (with "Delete on terminate" set) in an old platform.
>
> So we added our new Ceph storage to the old platform, removed instances
> (updated delete_on_terminate to 0 in Nova DB).
> Then we issued a retype so cinder-volume performed a `dd` of the volume
> from the old to the new storage.
>
> We then synced network/subnet/sg and started instances with same fixed IP
> and moved floating IPs to the new platform.
>
> Since you only have to swap storage you should experiment with powering
> off the instances and try doing a migrate of the volume
> but I suspect you need to either remove the instance or do some really
> nasty database operations.
>
> I would suggest always going through the API and recreate the instance
> from the migrated volume instead of changing in the DB.
> We had to update delete_on_terminate in DB but that was pretty trivial
> (and I even think there is a spec that is not implemented yet that will
> allow that from API).
>
> On 1/29/20 9:54 PM, Jean-Philippe Méthot wrote:
>
> Hi,
>
> We have a several hundred VMs which were built on cinder block devices as
> root drives which use a SAN backend. Now we want to change their backend
> from the SAN to Ceph.
> We can shutdown the VMs but we will not destroy them. I am aware that
> there is a cinder migrate volume command to change a volume’s backend, but
> it requires that the volume be completely detached. Forcing a detached
> state on
> that volume does let the volume migration take place, but the volume’s
> path in Nova block_device_mapping doesn’t update, for obvious reasons.
>
> So, I am considering forcing the volumes to a detached status in Cinder
> and then manually updating the nova db block_device_mapping entry for each
> volume so that the VM can boot back up afterwards.
> However, before I start toying with the database and accidentally break
> stuff, has anyone else ever done something similar? Got any tips or hints
> on how best to proceed?
>
> Jean-Philippe Méthot
> Openstack system administrator
> Administrateur système Openstack
> PlanetHoster inc.
>
>
>
>
>
>
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