Changing a LUKS Passphrase

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Cloud
Security

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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Lab Info

Level

Intermediate

Last updated

Sep 05, 2025

Duration

30m

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.
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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