CL170 – OpenStack Administration: Control Plane Management — Lesson 2: API Connectivity, Databases, Messaging, Cells, Endpoints, and Dependencies

Learning Objectives

• Configure the principal services, objects, workflows, and controls for API connectivity, databases, and messaging.
• Apply cells and service dependencies while preserving reviewable technical evidence.
• Recognize and correct the condition where a valid change produces the wrong outcome because variables, permissions, mapping, or sequencing are incorrect.

Detailed Topics

• API connectivity: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• databases: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• messaging: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• cells: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• service dependencies: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.

Instructor Demonstration

The instructor demonstrates api connectivity, databases, messaging, cells, endpoints, and dependencies by tracing architecture, commands, configuration, system messages, and evidence. The walkthrough tests how a valid change produces the wrong outcome because variables, permissions, mapping, or sequencing are incorrect and explains how to isolate the cause without masking related issues.

Hands-On Exercise

Implement the core workflow for API Connectivity, Databases, Messaging, Cells, Endpoints, and Dependencies and add the verified result to the control-plane health assessment, service configuration records, connectivity evidence, and recovery runbook.

1. Confirm scope, versions, access, dependencies, assumptions, and acceptance criteria.
2. Perform the workflow while recording commands, configuration, output, events, and decisions.
3. Test the normal path and one course-specific exception or boundary condition.
4. Retest the correction and document rollback, ownership, and follow-up actions.

Scenario Analysis

• Identify which dependency most strongly influences API connectivity in the stated scenario.
• Compare two approaches for cells and explain the security, reliability, performance, and support trade-offs.
• Decide what evidence must be retained in the control-plane health assessment, service configuration records, connectivity evidence, and recovery runbook before operational acceptance.

Troubleshooting Guidance

Begin with the first observable difference from the expected result. Check configuration, permissions, sequence, connectivity, and functional behavior separately, then correlate logs, events, commands, metrics, and configuration history. Treat the assumption that a valid change produces the wrong outcome because variables, permissions, mapping, or sequencing are incorrect as a hypothesis until a reproducible retest confirms the cause.

Validation Checklist

• The required configuration, permissions, sequence, connectivity, and functional behavior were checked and recorded.
• The normal path and a course-specific exception were tested.
• The control-plane health assessment, service configuration records, connectivity evidence, and recovery runbook links conclusions to commands, configuration, logs, metrics, or other objective evidence.
• Corrective actions, rollback, ownership, and handover notes are complete.

Lesson Outcome

Learners can apply API Connectivity, Databases, Messaging, Cells, Endpoints, and Dependencies, explain the observed platform behavior, and support the result with a reviewable control-plane health assessment, service configuration records, connectivity evidence, and recovery runbook.