Hi,
my problem, i got a couple of KVM/Qemu virtual machines running on some old server backed in local lvm storage. In paralell, i got a newly deployed openstack private cloud with cinder/ceph as storage backend. Now i somehow like to migrate these VMs from the old infrastructure to the new. I general it is very easy to just run the VMs on the openstack server, just:
> dd if=the_lvm_volume | pv | ssh storage_node 'rbd -p my_volume_pool import - new_volume'
And then start a VM from this volume, e.g. using virsh.
But this way, the volume is not recognized by cinder and the vm not by nova. Therefore i could not manage it with openstack.
It worked to import the volume as glance image and then start a machine from this image. But i like to have it as volume not image, especially because some of the VMs i like to migrate have multiple volumes attached to the VM.
And doing all via glance is a whole bunch of extra work.
I also tried to just create a volume in cinder, same size as the original volume and import to that volume but unfortunately rbd does not allow to import to an existing volume.
- Would it make sense to create a volume in cinder, delete it with rbd and import to a new volume with the same name?
UPDATE: Ok tested this option and it seemed to work. Created a volume (Size of the volume to import) in cinder, get the uuid of the volume then delete the corresponding volume in ceph manually using rbd. Then i did the rbd import with destination of the delete volume and made it bootable. Afterwards i was able to use this volume to start an instance using nova. A litte dirty workaround but it seems to do the job.
- Is there any other 'recommended' way to import whole VMs to a openstack environment?
Thx
Stefan
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