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How migrate instances between clouds with the same storage? [closed]

asked 2018-12-27 05:32:58 -0500

amkgi gravatar image

I have two OpenStack clouds. The first is Newton, and the second is Rocky. Both use the same Ceph. I find a lot of information on how I can do this (use snapshots (but it may take a long time)). In Newton I have 250 instances, and many of them are very critical for downtime. Is there still no way to do it easily and quickly with used single storage?

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Closed for the following reason the question is answered, right answer was accepted by amkgi
close date 2019-01-05 08:38:15.074105


I tried to migrate using virsh migrate and it was successful, but now I need to add the necessary information about this instance to the database so that it appears in OpenStack. But I don't quite understand how I can do it right.

amkgi gravatar imageamkgi ( 2018-12-27 08:18:20 -0500 )edit

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answered 2018-12-27 08:37:02 -0500

updated 2018-12-27 08:39:24 -0500

You are a bit vague how the two clouds use Ceph. Assuming your instances are booted from Ceph-based volumes, I suppose they could be migrated using the cinder manage command, which takes a LUN or whatever other reference on the backend and turns it into a volume.

So, shut down the instance, or snapshot the attached volume then create a new volume, then cinder manage the corresponding Ceph object on the destination cloud.

I am not sure if the RBD driver supports this.

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answered 2018-12-27 23:30:15 -0500

amkgi gravatar image

I decided it this way. I created similar instance in OpenStack Rocky. Looked at UUID disk in OpenStack Rocky and Newton, I connected to the Ceph and rename old UUID of disk to new UUID (rbd -p vms mv oldUUID_disk newUUID_disk). Before doing this, I deleted the disc that Rocky created. I shutted off both instance at this moment. This can do using a script to automate this process and minimize downtime.

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Asked: 2018-12-27 05:32:58 -0500

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Last updated: Dec 27 '18