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Changing a LUKS Passphrase

In this hands-on lab, we will learn how to safely change the passphrase used on a LUKS-encrypted volume without losing the data on the volume. LUKS passphrases should be changed on a regular schedule, just like account passwords. *This course is not approved or sponsored by Red Hat.*

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Last updated
Clock icon Aug 05, 2025

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Table of Contents

  1. Challenge

    Change the LUKS-Encrypted Volume Passphrase

    1. We first need to identify what volume patient_lv is part of. When a LUKS-encrypted volume is created, its original name includes the volume group name. Run the following command, and look for device in the output:
    sudo cryptsetup -v status patient_lv
    1. Run the following command to change the passphrase:
    sudo cryptsetup luksChangeKey /dev/mapper/luks_vg-patient_lv
    1. Enter the original passphrase (Pinehead1!) at the prompt.
    2. Enter the new passphrase (Waddle4thewin!) at the prompt.
    3. Re-enter the new passphrase (Waddle4thewin!) to confirm.

  2. Challenge

    Add a File Named `test.txt` to the LUKS-Encrypted Volume

    1. Determine where the patient_lv logical volume is mounted.
    df -h
    1. Change to the /data directory.
    cd /data
    1. Create a new file called touch.txt.
    touch /data/test.txt
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