The ungleich virtualisation handbook¶

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

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 = 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
• 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

See Also¶

• For storage see The ungleich ceph handbook