DO256 – Red Hat OpenShift Virtualization Administration II: Configuring Production Virtual Machines — Lesson 3: Migration Toolkit, Scheduling, Descheduler, High Availability, and Maintenance

Learning Objectives

• Evaluate integration, security, resilience, performance, and exceptions affecting Migration Toolkit, scheduling, and descheduler.
• Apply high availability and maintenance while preserving reviewable technical evidence.
• Recognize and correct the condition where the implementation succeeds normally but fails during dependency loss, scale, policy enforcement, or recovery.

Detailed Topics

• Migration Toolkit: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• scheduling: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• descheduler: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• high availability: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• maintenance: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.

Instructor Demonstration

The instructor demonstrates migration toolkit, scheduling, descheduler, high availability, and maintenance by tracing architecture, commands, configuration, system messages, and evidence. The walkthrough tests how the implementation succeeds normally but fails during dependency loss, scale, policy enforcement, or recovery and explains how to isolate the cause without masking related issues.

Hands-On Exercise

Introduce a realistic boundary condition and test corrective behavior for Migration Toolkit, Scheduling, Descheduler, High Availability, and Maintenance and add the verified result to the production VM architecture, RBAC and network design, backup and migration evidence, and resilience 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 Migration Toolkit in the stated scenario.
• Compare two approaches for high availability and explain the security, reliability, performance, and support trade-offs.
• Decide what evidence must be retained in the production VM architecture, RBAC and network design, backup and migration evidence, and resilience runbook before operational acceptance.

Troubleshooting Guidance

Begin with the first observable difference from the expected result. Check integration, security, boundary conditions, resilience, and performance separately, then correlate logs, events, commands, metrics, and configuration history. Treat the assumption that the implementation succeeds normally but fails during dependency loss, scale, policy enforcement, or recovery as a hypothesis until a reproducible retest confirms the cause.

Validation Checklist

• The required integration, security, boundary conditions, resilience, and performance were checked and recorded.
• The normal path and a course-specific exception were tested.
• The production VM architecture, RBAC and network design, backup and migration evidence, and resilience 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 Migration Toolkit, Scheduling, Descheduler, High Availability, and Maintenance, explain the observed platform behavior, and support the result with a reviewable production VM architecture, RBAC and network design, backup and migration evidence, and resilience runbook.