Difference between revisions of "stoney conductor: VM Backup"
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== Snapshot == | == Snapshot == | ||
# Create a snapshot with state: | # Create a snapshot with state: | ||
| − | #* Save the VMs state: | + | #* Save the VMs state: <syntaxhighlight lang="bash">virsh save my-vm my-vm.stat</syntaxhighlight> |
| − | <syntaxhighlight lang="bash">virsh save my-vm my-vm. | + | |
#* Rename the actual disk image: <code>mv my-vm.qcow2 my-vm-backup.qcow2</code>. | #* Rename the actual disk image: <code>mv my-vm.qcow2 my-vm-backup.qcow2</code>. | ||
#* Create the new disk image with the old as backing file: <code>qemu-img create -f qcow2 -b my-vm-backup.qcow2 my-vm.qcow2</code>. | #* Create the new disk image with the old as backing file: <code>qemu-img create -f qcow2 -b my-vm-backup.qcow2 my-vm.qcow2</code>. | ||
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== Merge == | == Merge == | ||
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== Retain == | == Retain == | ||
Revision as of 13:34, 22 October 2013
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
- 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.
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- Restore the VMs state:
virsh restore my-vm.state.
- Save the VMs state:
- 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". - 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
- Move the old disk image to the backup location and add the date as suffix to not overwrite older backups:
