The ungleich virtualisation handbook » History » Revision 3

Revision 2 (Nico Schottelius, 11/06/2018 12:02 PM) → Revision 3/6 (Nico Schottelius, 11/06/2018 12:06 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>*) <vimid>*) 
 * Locate the disk in ceph 
 ** Locate the correct ceph pool: *ceph osd lspools* ("SOURCE-POOL") 
 ** rbd list -p <SOURCE-POOL> <CEPH POOL> | grep <SOURCE-VMID> <VMID> 
 ** This gives you the *SOURCE-IMAGE-NAME* *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) 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> <CEPH POOL>/<IMAGE NAME> - | ssh <ANY SERVER IN OTHER PLACE> 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> 
 * Delete the disk of the new VM <TARGET POOL>/import-<VMID>" 

 h2. See Also 

 * For storage see [[The ungleich ceph handbook]]