This is for you when you want to mount a dmcrypt encrypted partition manually, e.g. from a live CD.

First, open the dmcrypted partition (You need to provide some name. It may, but does not need to, be your LVM group name):

cryptsetup luksOpen /dev/sda5 some_name

Since your encryption container most likely contains an LVM group (root + swap for example), enable the logical volume manager (replace LVM_NAME with your volume group's name):

vgchange -ay LVM_NAME

After that, you can your access (mount, fsck, ...) LVM partitions at locations like /dev/mapper/LVM_NAME-root

To mount, create some mount-point (like mkdir /mnt/ext-root), and then

mount /dev/mapper/LVM_NAME-root /mnt/ext-root

GRUB

It is possible that GRUB (your system loader) will pick up on the new LVM group and add an entry to your boot menu.

To revert this

make sure the encrypted partition is no longer open
run vgscan
run update-grub

Arne Hartherz

makandra.com

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Last edit

2016-04-26

Tobias Kraze

Keywords

decrypt

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Source code in this card is licensed under the MIT License.

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Posted by Arne Hartherz to makandra dev (2012-05-07 13:16)

How to access a dmcrypt-encrypted partition from outside your system

GRUB

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Summary

Introduction