Logical Volume migration to a New Openstack environment

Eugen Block eblock at nde.ag
Wed Jan 5 14:18:05 UTC 2022

You can import both image files (OS and LVM) into ceph with rbd  
import, then use 'cinder manage' to make them available as volumes.  
Then create a new instance from volume and attach the second volume to  
it. That should work without having to create glance images first.

Zitat von Sean Mooney <smooney at redhat.com>:

> On Wed, 2022-01-05 at 16:24 +0530, KK CHN wrote:
>> List,
>> I am in need to migrate a Virtual machine ( running in an old OpenStack
>> environment with only one controller).  This VM has its own disk file +  a
>> logical volume attached to it with application data on it.   Only Cinder
>> backend( No rbd/ceph backend configured ) for this environment.
>> Now I am migrating this Virtual machine to another OpenStack(ussuri  with
>> three controllers, three compute nodes and three storage nodes) environment
>> with ceph/rbd backend.
>> I am able to  export the VM with its disk file and  import it to the other
>> openstack environment and able to boot the machine.
>> But  How to export the attached logical volume from the  old VM and attach
>> to the  VM  in the other environment ?
> if its just a singel vm you can convert teh volume to an image then  
> download and upload it to the
> the new cloud and finally create a volume form that image.
> if you have to do this wiht more then one vm you might want to look at
> https://github.com/os-migrate/os-migrate
> which is being created to automate migrating workloads betwen clouds
> it will copy the volume in a more efficent way by directly copying  
> the data form the source could to the destination witout creating  
> images.
>> what is the  methodology to follow to  export this logical volume in the
>> old openstack VM   and import to the new VM running in the other openstack
>> environment ?
> the manual procedure is to convert it to a glance image and download  
> and upload it. that only works if glance is not useing volume backed  
> images.
> os-migrate will create a migration vm in each cloud, detach the  
> volume from its current vm on the source cloud then attach it to the  
> migration vm
> on the dest cloud it will create a new empty volume and attch it to  
> the might vm.
> then it basicly rsyncs the datat from one migration vm to the other.
>> kindly share  your suggestions/expertise to perform this
>> Thanks in advance for your valuable guidance.
>> Krish

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