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97 lines
5.9 KiB
Markdown
97 lines
5.9 KiB
Markdown
---
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lang: en
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layout: doc
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permalink: /doc/mount-from-other-os/
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redirect_from:
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- /en/doc/mount-from-other-os/
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- /doc/MountFromOtherOs/
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- /wiki/MountFromOtherOs/
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ref: 175
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title: How to mount a Qubes partition from another OS
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---
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When a Qubes OS install is unbootable or booting it is otherwise undesirable, this process allows for the recovery of files stored within the system.
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These functions are manual and do not require any Qubes specific tools. All steps assume the default Qubes install with the following components:
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- LUKS encrypted disk
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- LVM based VM storage
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Before beginning, if attempting to access one Qubes system from another, it is recommended to pass the entire encrypted Qubes disk to an isolated app qube.
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This can be done with the command `qvm-block attach <isolated vm> dom0:<disk>` in dom0.
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Decrypting the Disk
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-----------------
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1. Find the disk to be accessed:
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1. Open a Linux terminal in either dom0 or the app qube the disk was passed through to and enter `lsblk`, which will result in an output similar to the following.
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In this example, the currently booted Qubes system is installed on `sda` and the qubes system to be accessed is on `nvme0n1p2`.
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```
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sda 8:0 0 111.8G 0 disk
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├─sda1 8:1 0 200M 0 part /boot/efi
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├─sda2 8:2 0 1G 0 part /boot
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└─sda3 8:3 0 110.6G 0 part
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└─luks-fed62fc2-2674-266d-2667-2667259cbdec 253:0 0 110.6G 0 crypt
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├─qubes_dom0-pool00_tmeta 253:1 0 88M 0 lvm
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│ └─qubes_dom0-pool00-tpool 253:3 0 84.4G 0 lvm
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│ ├─qubes_dom0-root 253:4 0 84.4G 0 lvm /
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│ ├─qubes_dom0-pool00 253:6 0 84.4G 0 lvm
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├─qubes_dom0-vm--fedora--30--dvm--private--1576749131--back 253:7 0 2G 0 lvm
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├─qubes_dom0-pool00_tdata 253:2 0 84.4G 0 lvm
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│ └─qubes_dom0-pool00-tpool 253:3 0 84.4G 0 lvm
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│ ├─qubes_dom0-root 253:4 0 84.4G 0 lvm /
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│ ├─qubes_dom0-pool00 253:6 0 84.4G 0 lvm
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│ ├─qubes_dom0-vm--fedora--30--dvm--private--1576749131--back 253:7 0 2G 0 lvm
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└─qubes_dom0-swap 253:5 0 4G 0 lvm [SWAP]
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sdb 8:16 0 447.1G 0 disk
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├─sdb1 8:17 0 549M 0 part
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└─sdb2 8:18 0 446.6G 0 part
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sr0 11:0 1 1024M 0 rom
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nvme0n1 259:0 0 465.8G 0 disk
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├─nvme0n1p1 259:1 0 1G 0 part
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└─nvme0n1p2 259:2 0 464.8G 0 part
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```
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2. Decrypt the disk using the command `cryptsetup luksOpen /dev/<disk>`.
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Accessing LVM Logical Volumes
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-----------------------------
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3. If using an app qube or standard Linux, LVM should automatically discover the Qubes LVM configuration. In this case, continue to step 4.
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1. Qubes uses the default name `qubes_dom0` for it's LVM VG.
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This will conflict with the name of the VG of the currently installed system.
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To read both, you will have to rename the VG.
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*Note:* If this is not reversed, the Qubes install being accessed will not be bootable.
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2. Find the UUID of the vg to be accessed using the command `vgdisplay`.
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This will be the VG named `qubes_dom0` which is not marked active.
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3. The command `vgrename <UUID> other_install` will rename the VG.
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4. Run the command `vgscan` to add any new VGs to the device list.
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Mounting the disk
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-----------------
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5. Find the disk to be accessed. The `lsblk` command above may be of use. The following rules apply by default:
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| Disk name | Data type | Explanation |
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| ----------------------------- | ----------------- | ------------------------------------------- |
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| other\_install/root | dom0 root | The root partition of dom0. |
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| other\_install/<vm>-private | VM | The /rw partition of the named VM. |
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| other\_install/<vm>-root | template root | The root partition of the named template. |
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| other\_install/pool00\_tmeta | LVM Metadata | The metadata LV of this disk. |
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6. Mount the disk using the command `mount /dev/other_install/<lv name> <mountpoint>`.
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*Note:* Any compromised data which exists in the volume to be mounted will be accessible here.
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Do not mount untrusted partitions in dom0.
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At this point, all files are available in the chosen mountpoint.
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Reverting Changes
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-----------------------------------------
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Any changes which were made to the system in the above steps will need to be reverted before the disk will properly boot.
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However, LVM will not allow an VG to be renamed to a name already in use.
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Thes steps must occur either in an app qube or using recovery media.
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1. Unmount any disks that were accessed.
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2. Rename the VG back to qubes\_dom0 using the command `vgrename other_install qubes_dom0`.
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