stoney conductor: VM Backup

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Overview

This page describes how the VMs and VM-Templates are backed-up inside the stoney cloud.

Basic idea

The main idea to backup a VM or a VM-Template is, to divide the task into three subtasks:

  • Snapshot: Save the machines state (CPU, Memory and Disk)
  • Merge: Merge the Disk-Snapshot with the live-image
  • Retain: Export the snapshot files

A more detailed and technical description for these three sub-processes can be found in the following sub-chapters.

Snapshot

  1. Create a snapshot with state:
    • Save the VMs state:
      virsh save my-vm my-vm.stat
    • Rename the actual disk image: mv my-vm.qcow2 my-vm-backup.qcow2.
    • Create the new disk image with the old as backing file: qemu-img create -f qcow2 -b my-vm-backup.qcow2 my-vm.qcow2.
    • Set correct ownership and permission to the newly created image:
      • chown root:vm-storage my-vm.qcow2.
      • chmod 660 my-vm.qcow2.
    • Restore the VMs state: virsh restore my-vm.state.
  2. Merge the disk images my-vm.qcow2 and my-vm-snap.qcow2 to a single image: virsh qemu-monitor-command my-vm --hmp "block_stream drive-virtio-disk0".
  3. Move the files to the backup location:
    • Move the old disk image to the backup location and add the date as suffix to not overwrite older backups: mv my-vm-backup.qcow2 /path/to/backup/my-vm-backup.qcow2.date
    • Move the state file to the backup location and add the date as suffix to not overwrite older backups: mv my-vm.state /path/to/backup/my-vm.state.date

Merge

Retain

State of the art

Next steps