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Troubleshooting & Problem Resolution Flashcards

7 cards from real COA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Troubleshooting & Problem Resolution flashcards as text

  1. An instance is stuck in 'ERROR' state after a failed live migration. Which command retrieves the error details from the Nova compute log?

    Answer: openstack server show

    The 'openstack server show' command displays fault messages and the last error that caused an instance to enter ERROR state.

  2. After updating the Neutron ML2 plugin configuration, the neutron-server fails to start. What is the first log file you should inspect?

    Answer: /var/log/neutron/server.log

    The neutron-server.log captures startup errors including plugin misconfiguration, making it the primary source for server-start failures.

  3. A tenant reports that their floating IP is assigned but they cannot reach the instance from the internet. Which Neutron resource should you verify first?

    Answer: Router external gateway association

    A floating IP requires a router with an external gateway set; without it, NAT cannot route traffic between the external network and the tenant network.

  4. You run 'openstack volume list' and see a volume stuck in 'attaching' state for over 30 minutes. What is the recommended corrective action?

    Answer: Run openstack volume set --state available

    Forcing the Cinder volume state back to 'available' with 'openstack volume set --state' unblocks stuck attach operations without data loss.

  5. Which command verifies that all Nova compute services are up and reporting correctly across the deployment?

    Answer: openstack compute service list

    'openstack compute service list' shows the state and status of every Nova service node, including whether each is 'up' or 'down'.

  6. A Keystone token validation is failing with 'Service Unavailable'. The Keystone service is running but errors appear in the log referencing the Fernet key repository. What is the likely cause?

    Answer: The Fernet key rotation has invalidated all existing tokens

    Fernet key rotation invalidates tokens signed with older keys; if rotation occurs too aggressively before tokens expire, active sessions fail validation.

  7. An operator finds that Nova is scheduling all new instances to a single compute node despite others being available. Which service configuration option controls the scheduler's host selection algorithm?

    Answer: scheduler_default_filters in nova.conf

    The 'scheduler_default_filters' option defines which filters (e.g., RamFilter, CoreFilter, ComputeFilter) the Nova scheduler applies when selecting a host.