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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

Updated by Jin-Guk Kwon 11 months ago · 6 revisions