<div dir="ltr">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). <div><br></div><div>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. <br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><p><br></p><p style="background-image:initial;background-position:initial;background-repeat:initial"><a name="SignatureSanitizer_SafeHtmlFilter__MailAutoSig"><b><span style="font-size:10pt;font-family:Arial,sans-serif;color:black">Tony Pearce</span></b></a><span style="font-size:9pt;font-family:Arial,sans-serif;color:black">
| </span><b><span style="font-family:Arial,sans-serif;color:rgb(0,112,192)"><span style="font-size:9pt">Senior Network Engineer /
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</p><p> </p></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 30 Jan 2020 at 16:39, Tobias Urdin <<a href="mailto:tobias.urdin@binero.se">tobias.urdin@binero.se</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
We did this something similar recently, we booted all instances from
Cinder volume (with "Delete on terminate" set) in an old platform.<br>
<br>
So we added our new Ceph storage to the old platform, removed
instances (updated delete_on_terminate to 0 in Nova DB).<br>
Then we issued a retype so cinder-volume performed a `dd` of the
volume from the old to the new storage.<br>
<br>
We then synced network/subnet/sg and started instances with same
fixed IP and moved floating IPs to the new platform.<br>
<br>
Since you only have to swap storage you should experiment with
powering off the instances and try doing a migrate of the volume<br>
but I suspect you need to either remove the instance or do some
really nasty database operations.<br>
<br>
I would suggest always going through the API and recreate the
instance from the migrated volume instead of changing in the DB.<br>
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).<br>
<br>
<div>On 1/29/20 9:54 PM, Jean-Philippe
Méthot wrote:<br>
</div>
<blockquote type="cite">
Hi,
<div><br>
</div>
<div>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.</div>
<div>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</div>
<div>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.</div>
<div><br>
</div>
<div>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. </div>
<div>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?</div>
<div><br>
</div>
<div>
<div>
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Jean-Philippe Méthot</div>
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Openstack system administrator</div>
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Administrateur système Openstack</div>
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PlanetHoster inc.</div>
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</blockquote>
<br>
</div>
</blockquote></div>