How to Generate a Unique RHEL dmi.system.uuid Systerm ID

Why generate a unique RHEL dmi.system.uuid System ID?

This procedure is useful in scenarios when cloning virtual machines where duplicate UUIDs can cause issues with Red Hat software through SubscriptionManager.

Generate a new UUID.

Create a new unique UUID

    $>sudo uuidgen

This command will output a new UUID.

Example:

eae7fe44-8256-4072-813f-0e1d691f093c

Create a custom fact file for RHEL subscription manager

Create a JSON file containing the new UUID and save it in the /etc/rhsm/facts/ directory.

This tells a subscription manager to report this custom UUID instead of the one detected from the DMI.

    $>echo '{"dmi.system.uuid": < YOUR_NEW_UUID >}' > /etc/rhsm/facts/uuid_override.facts

Where < YOUR_NEW_UUID > is the UUID generated in the previous step.

Example:

    echo '{"dmi.system.uuid": "eae7fe44-8256-4072-813f-0e1d691f093c"}' > /etc/rhsm/facts/uuid_override.facts

Verify that Subscription Manager is now reporting < YOUR_NEW_UUID > .

    subscription-manager facts | grep dmi.system.uuid

The output will show < YOUR_NEW_UUID > in the uuid_override.facts file.

Re-register the client system :

If the system was previously registered with a duplicate UUID, it may be necessary to unregister and re-register it with Red Hat Subscription Manager or a Satellite server to ensure that the new UUID is properly reported.

    $>sudo subscription-manager unregister --force
    $>sudo subscription-manager register --auto-attach

Adjust the registration command based on your environment ( e.g. , if using a Satellite server, use an activation key ) .

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How to Generate a Unique RHEL dmi.system.uuid Systerm ID

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