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Encrypting a Volume with NBDE

In this hands-on lab, we will use Network-Bound Disk Encryption (NBDE) to encrypt a volume on a host. The volume has already been created and encrypted with LUKS. Now we need to implement NBDE so the volume can be automatically decrypted at boot. *This course is not approved or sponsored by Red Hat.*

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Lab Info
Level
Intermediate
Last updated
Jul 13, 2025
Duration
30m

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Table of Contents
  1. Challenge

    Set Up Tang Server

    Check the Server 1 status first:

    1. In your Server 1 terminal window, check the status of the LUKS-encrypted volume (payroll) by running the following command:
      cryptsetup -v status payroll
      
    2. Determine where the volume is mounted by running the following command:
      df -h
      
    3. List the contents of the payroll directory by running the following command:
      ls /payroll
      

    Switch to your Server 2 terminal window:

    1. Install Tang by running the following command:
      sudo yum install -y tang
      
    2. Generate the keys for Tang by running the following command:
      /usr/libexec/tangd-keygen /var/db/tang
      
    3. Configure Tang to run at boot by running the following command:
      sudo systemctl enable tangd.socket --now
      
    4. Verify that two Tang keys were created by running the following command:
      sudo ls /var/db/tang
      
    5. Determine the IP address of Server 2 by running the following command:
      ip addr
      
  2. Challenge

    Encrypt `/dev/xvdg` Using NBDE
    1. First, install the necessary Clevis packages on Server 1 by running the following command:
      sudo yum install -y clevis clevis-luks clevis-dracut
      
    2. Next, encrypt the /dev/xvdg disk with the Tang key from Server 2 by running the following command:
      sudo clevis bind luks -d /dev/xvdg tang '{"url":"http://10.0.0.<SERVER2_IP>"}'
      
    3. Verify that the key was entered into the LUKS header of /dev/xvdg by running the following command:
      sudo luksmeta show -d /dev/xvdg
      
    4. Verify that slot 1 is active and there is a key value next to it.
    5. Lastly, run the sudo dracut -f command to force to retrieval of the Tang key at boot.
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