mirror of
https://github.com/QubesOS/qubes-doc.git
synced 2024-12-22 05:55:05 -05:00
160 lines
4.2 KiB
ReStructuredText
160 lines
4.2 KiB
ReStructuredText
=================
|
||
Secondary storage
|
||
=================
|
||
|
||
|
||
Suppose you have a fast but small primary SSD and a large but slow
|
||
secondary HDD. You want to store a subset of your app qubes on the HDD.
|
||
|
||
Instructions
|
||
------------
|
||
|
||
|
||
Qubes 4.0 is more flexible than earlier versions about placing different
|
||
VMs on different disks. For example, you can keep templates on one disk
|
||
and app qubes on another, without messy symlinks.
|
||
|
||
These steps assume you have already created a separate `volume group <https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/vg_admin#VG_create>`__
|
||
and `thin pool <https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/thinly_provisioned_volume_creation>`__
|
||
(not thin volume) for your HDD. See also `this example <https://www.linux.com/blog/how-full-encrypt-your-linux-system-lvm-luks>`__
|
||
if you would like to create an encrypted LVM pool (but note you can use
|
||
a single logical volume if preferred, and to use the ``-T`` option on
|
||
``lvcreate`` to specify it is thin). You can find the commands for this
|
||
example applied to Qubes at the bottom of this R4.0 section.
|
||
|
||
First, collect some information in a dom0 terminal:
|
||
|
||
.. code:: bash
|
||
|
||
sudo pvs
|
||
sudo lvs
|
||
|
||
|
||
|
||
Take note of the VG and thin pool names for your HDD, then register it
|
||
with Qubes:
|
||
|
||
.. code:: bash
|
||
|
||
# <pool_name> is a freely chosen pool name
|
||
# <vg_name> is LVM volume group name
|
||
# <thin_pool_name> is LVM thin pool name
|
||
qvm-pool --add <pool_name> lvm_thin -o volume_group=<vg_name>,thin_pool=<thin_pool_name>,revisions_to_keep=2
|
||
|
||
|
||
Now, you can create qubes in that pool:
|
||
|
||
.. code:: bash
|
||
|
||
qvm-create -P <pool_name> --label red <vmname>
|
||
|
||
|
||
|
||
It isn’t possible to directly migrate an existing qube to the new pool,
|
||
but you can clone it there, then remove the old one:
|
||
|
||
.. code:: bash
|
||
|
||
qvm-clone -P <pool_name> <sourceVMname> <cloneVMname>
|
||
qvm-remove <sourceVMname>
|
||
|
||
|
||
|
||
If that was a template, or other qube referenced elsewhere (NetVM or
|
||
such), you will need to adjust those references manually after moving.
|
||
For example:
|
||
|
||
.. code:: bash
|
||
|
||
qvm-prefs <appvmname_based_on_old_template> template <new_template_name>
|
||
|
||
|
||
|
||
In theory, you can still use file-based disk images (“file” pool
|
||
driver), but it lacks some features such as you won’t be able to do
|
||
backups without shutting down the qube.
|
||
|
||
Example HDD setup
|
||
^^^^^^^^^^^^^^^^^
|
||
|
||
|
||
Assuming the secondary hard disk is at /dev/sdb (it will be completely
|
||
erased), you can set it up for encryption by doing in a dom0 terminal
|
||
(use the same passphrase as the main Qubes disk to avoid a second
|
||
password prompt at boot):
|
||
|
||
.. code:: bash
|
||
|
||
sudo cryptsetup luksFormat --hash=sha512 --key-size=512 --cipher=aes-xts-plain64 --verify-passphrase /dev/sdb
|
||
sudo blkid /dev/sdb
|
||
|
||
|
||
|
||
Note the device’s UUID (in this example “b209…”), we will use it as its
|
||
luks name for auto-mounting at boot, by doing:
|
||
|
||
.. code:: bash
|
||
|
||
sudo nano /etc/crypttab
|
||
|
||
|
||
|
||
And adding this line (change both “b209…” for your device’s UUID from
|
||
blkid) to crypttab:
|
||
|
||
.. code:: bash
|
||
|
||
luks-b20975aa-8318-433d-8508-6c23982c6cde UUID=b20975aa-8318-433d-8508-6c23982c6cde none
|
||
|
||
|
||
|
||
Reboot the computer so the new luks device appears at
|
||
/dev/mapper/luks-b209… and we can then create its pool, by doing this on
|
||
a dom0 terminal (substitute the b209… UUIDs with yours):
|
||
|
||
First create the physical volume
|
||
|
||
.. code:: bash
|
||
|
||
sudo pvcreate /dev/mapper/luks-b20975aa-8318-433d-8508-6c23982c6cde
|
||
|
||
|
||
|
||
|
||
|
||
Then create the LVM volume group, we will use for example “qubes” as the
|
||
:
|
||
|
||
.. code:: bash
|
||
|
||
sudo vgcreate qubes /dev/mapper/luks-b20975aa-8318-433d-8508-6c23982c6cde
|
||
|
||
|
||
|
||
And then use “poolhd0” as the (LVM thin pool name):
|
||
|
||
.. code:: bash
|
||
|
||
sudo lvcreate -T -n poolhd0 -l +100%FREE qubes
|
||
|
||
|
||
|
||
Finally we will tell Qubes to add a new pool on the just created thin
|
||
pool
|
||
|
||
.. code:: bash
|
||
|
||
qvm-pool --add poolhd0_qubes lvm_thin -o volume_group=qubes,thin_pool=poolhd0,revisions_to_keep=2
|
||
|
||
|
||
|
||
By default VMs will be created on the main Qubes disk (i.e. a small
|
||
SSD), to create them on this secondary HDD do the following on a dom0
|
||
terminal:
|
||
|
||
.. code:: bash
|
||
|
||
qvm-create -P poolhd0_qubes --label red unstrusted-hdd
|
||
|
||
|