Scenario D: Node Lifecycle Management

Duration

15 minutes total

Objective

Demonstrate controlled node onboarding with compliance gating and clean decommissioning.

Presenter Flow

1. Explain that compute03 is defined but dormant by default.
2. Add node: bash cd demo/vagrant ANSIBLE_CONFIG=ansible.cfg ansible-playbook ../playbooks/scenario-d-lifecycle.yml -i inventory/hosts.yml --tags add
3. Run compliance gate: bash ANSIBLE_CONFIG=ansible.cfg ansible-playbook ../playbooks/scenario-d-lifecycle.yml -i inventory/hosts.yml --tags verify
4. Show successful cluster registration when gate passes.
5. Decommission node: bash ANSIBLE_CONFIG=ansible.cfg ansible-playbook ../playbooks/scenario-d-lifecycle.yml -i inventory/hosts.yml --tags remove

Talking Points

• Nodes do not join the production partition without passing compliance checks.
• Identity and scheduler registration are automated and auditable.
• Decommissioning revokes credentials and removes scheduling access.
• Lifecycle controls reduce risk from unmanaged scale events.

Expected Output

• compute03 starts only during lifecycle demo.
• FreeIPA host record for compute03.demo.lab is created on add and removed on decommission.
• Slurm config includes compute03 during add and removes it during decommission.
• Compliance gate reports pass/fail explicitly before join.

Verification Commands

cd demo/vagrant && vagrant status compute03
vagrant ssh mgmt01 -c "ipa host-show compute03.demo.lab"
vagrant ssh mgmt01 -c "grep -E '^NodeName=compute03' /etc/slurm/slurm.conf"
vagrant ssh mgmt01 -c "scontrol reconfigure && scontrol show nodes"

Timing Notes

• 3 min: Explain lifecycle and dormant-node model
• 4 min: Add compute03
• 3 min: Run and discuss compliance gate results
• 4 min: Decommission and validate cleanup
• 1 min: Summary

Presenter Notes

• If compliance gate fails, use that as the expected safety demonstration.
• Keep focus on control points: provision -> gate -> register -> revoke.
• Link this to operational change control and incident containment narratives.