Lab
A Cloud Guru

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

Intermediate

Duration

30m

Published

May 17, 2019

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
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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