mirror of
https://github.com/QubesOS/qubes-doc.git
synced 2024-12-22 14:05:15 -05:00
52 lines
1.9 KiB
ReStructuredText
52 lines
1.9 KiB
ReStructuredText
|
========================
|
|||
|
|
Volume backup and revert
|
|||
|
|
========================
|
|||
|
|
|
|||
|
|
|
|||
|
|
With Qubes, it is possible to revert one of a VM’s storage volumes to a
|
|||
|
|
previous state using the automatic snapshot that is normally saved every
|
|||
|
|
time a VM is shutdown. (Note that this is a different, lower level
|
|||
|
|
activity than the :doc:`Backup, Restoration, and Migration </user/how-to-guides/how-to-back-up-restore-and-migrate>` process.)
|
|||
|
|
|
|||
|
|
In Qubes, when you create a new VM, it’s volumes are stored in one of
|
|||
|
|
the system’s :doc:`Storage Pools </user/advanced-topics/secondary-storage>`. On pool creation,
|
|||
|
|
a revisions_to_keep default value is set for the entire pool. (For a
|
|||
|
|
pool creation example, see :doc:`Storing app qubes on Secondary Drives </user/advanced-topics/secondary-storage>`.) Thereafter, each volume associated
|
|||
|
|
with a VM that is stored in this pool inherits the pool default
|
|||
|
|
revisions_to_keep.
|
|||
|
|
|
|||
|
|
For the private volume associated with a VM named vmname, you may
|
|||
|
|
inspect the value of revisions_to_keep from the dom0 CLI as follows:
|
|||
|
|
|
|||
|
|
.. code:: bash
|
|||
|
|
|
|||
|
|
qvm-volume info vmname:private
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
The output of the above command will also display the “Available
|
|||
|
|
revisions (for revert)” at the bottom. For a very large volume in a
|
|||
|
|
small pool, revisions_to_keep should probably be set to the minimum
|
|||
|
|
value of 1 to minimize the possibility of the pool being accidentally
|
|||
|
|
filled up by snapshots. For a smaller volume for which you would like to
|
|||
|
|
have the future option of reverting, revisions_to_keep should probably
|
|||
|
|
be set to at least 2. To set revisions_to_keep for this same VM / volume
|
|||
|
|
example:
|
|||
|
|
|
|||
|
|
.. code:: bash
|
|||
|
|
|
|||
|
|
qvm-volume config vmname:private revisions_to_keep 2
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
With the VM stopped, you may revert to an older snapshot of the private
|
|||
|
|
volume from the above list of “Available revisions (for revert)”, where
|
|||
|
|
the last item on the list with the largest integer is the most recent
|
|||
|
|
snapshot:
|
|||
|
|
|
|||
|
|
.. code:: bash
|
|||
|
|
|
|||
|
|
qvm-volume revert vmname:private <revision>
|
|||
|
|
|
|||
|
|
|