The ungleich virtualisation handbook » History » Revision 4
Revision 3 (Nico Schottelius, 11/06/2018 12:06 PM) → Revision 4/6 (Nico Schottelius, 11/06/2018 12:09 PM)
h1. The ungleich virtualisation handbook
h2. Introduction
* A place is autonomous data center and does not share resources with another place.
* The storage clusters are separated so that they don't influence each other
* Networks are place local -> changing the place means changing the IP addresses
h2. Migrating a VM from one place to another
* Find the VM id (*onevm list* in opennebula) ("SOURCE-VMID")
* Stop the VM (*onevm stop <SOURCE-VMID>*)
* Locate the disk in ceph
** Locate the correct ceph pool: *ceph osd lspools* ("SOURCE-POOL")
** rbd list -p <SOURCE-POOL> | grep <SOURCE-VMID>
** This gives you the *SOURCE-IMAGE-NAME*
* Login to the *destination place* and find out the target ceph pool
** Locate the correct ceph pool: *ceph osd lspools* (this is the TARGET-POOL)
* We define the *TARGET-IMAGE-NAME* TARGET-IMAGE-NAME = import-SOURCE-VMID
* Transfer the disk into the other place ceph cluster
** rbd export <SOURCE-POOL>/<SOURCE-IMAGE-NAME> - | ssh <ANY SERVER IN OTHER PLACE> "rbd import <TARGET-POOL>/<TARGET-IMAGE-NAME>"
* Create a new VM in the target place with the same parameters as the original VM
** CPU, VCPU, RAM, disk size
** It's id is the *TARGET-VMID* TARGET-VMID
* Stop the new VM
* Locate the disk of the new VM
** rbd list -p <TARGET-POOL> | grep <TARGET-VMID>
** The name of this disk is *NEW-DISK-ID*
* Delete the disk of the new VM
** rbd rm <TARGET-POOL>/<NEW-DISK-ID>
* Move the imported image to replace the disk we deleted
** rbd mv <TARGET-POOL>/<TARGET-IMAGE-NAME> <TARGET-POOL>/<NEW-DISK-ID>
* Start the VM
* Checkout the network configuration, update the customer with the new network details
h2. See Also
* For storage see [[The ungleich ceph handbook]]