I have a Windows 7 KVM guest running on a Centos 6.9 KVM host. I would like to upgrade the host system to CentOS 7.4.1708 without having to re-install from scratch the KVM guest. What procedure should I use to move the guest off the host system, upgrade the CentOS version and then move the KVM Guest back to the host? For example, Is there a recommended way to move the KVM Guest to a USB stick and then move it back to the upgraded host? Thank you for your help.
On 21/01/18 05:24, Paul R. Ganci wrote:
I have a Windows 7 KVM guest running on a Centos 6.9 KVM host. I would like to upgrade the host system to CentOS 7.4.1708 without having to re-install from scratch the KVM guest. What procedure should I use to move the guest off the host system, upgrade the CentOS version and then move the KVM Guest back to the host? For example, Is there a recommended way to move the KVM Guest to a USB stick and then move it back to the upgraded host? Thank you for your help.
Not enough details but yeah, that's doable with some easy steps (but then also depends on what you have availble, etc ..) - shutdown guests - save all the .qcow2 files (assuming that you don't use raw devices for backend disks, like for example lvm) from /var/lib/libvirt/images (default location, but again, it depends on your config) - export the .xml files used by libvirt to start the nodes - reinstall the node (there is no way to upgrade from 6 to 7, and fresh install is always better anyway) - reconfigure new node with same network bridge (if any, depends on your situation) and ensure libvirt, qemu-kvm (and deps) are installed/started - import back .qcow2 files (in /var/lib/libvirt/images) - "virsh define" against .xml files to configure the VMs on the nodes - start the VMs
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Fabian Arrotin -
Paul R. Ganci