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The ungleich virtualisation handbook » History » Version 5

Nico Schottelius, 11/06/2018 12:10 PM

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