Red Hat OpenShift Installation Lab (DO322) — Lesson 1: Installation Architecture, Infrastructure Prerequisites, DNS, and Load Balancing

Learning Objectives

• Explain the structures, services, data, settings, roles, and dependencies governing installation architecture and platform prerequisites.
• Implement and validate DNS records, load balancers, and network planning using reviewable evidence.
• Evaluate the condition where the observed result differs from the approved configuration because a prerequisite, permission, dependency, or sequence was missed and select a proportionate corrective response.

Detailed Topics

• installation architecture applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.
• platform prerequisites applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.
• DNS records applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.
• load balancers applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.
• network planning applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.

Instructor Demonstration

The instructor traces an infrastructure team building a repeatable OpenShift installation for a production-ready platform. The walkthrough connects navigation, commands, configuration logic, system messages, and evidence captured in the OpenShift installation plan, infrastructure readiness checklist, installation evidence, and recovery procedure. It also tests the exception where the observed result differs from the approved configuration because a prerequisite, permission, dependency, or sequence was missed.

Hands-On Exercise

Complete a controlled Red Hat exercise covering Installation Architecture, Infrastructure Prerequisites, DNS, and Load Balancing and preserve the verified result in the OpenShift installation plan, infrastructure readiness checklist, installation evidence, and recovery procedure.

1. Confirm scope, prerequisites, versions, identities, dependencies, and acceptance criteria.
2. Execute the workflow while recording commands, settings, outputs, events, and system messages.
3. Test normal behavior, one boundary condition, and the stated exception.
4. Document corrections, evidence, ownership, retest criteria, rollback, and handover actions.

Scenario Analysis

• Identify which object, service, policy, setting, or sequence most strongly influences installation architecture.
• Compare two defensible responses and explain technical, security, operational, and support trade-offs.
• Determine how the OpenShift installation plan, infrastructure readiness checklist, installation evidence, and recovery procedure should be approved, retained, retested, and updated.

Troubleshooting Guidance

Start where expected behavior first differs from the observed result. Check prerequisites, identity, configuration order, version compatibility, connectivity, status, resource limits, and evidence separately. Treat “the observed result differs from the approved configuration because a prerequisite, permission, dependency, or sequence was missed” as a hypothesis until commands, logs, settings, and retest outcomes confirm the cause.

Validation Checklist

• Required platform components, identities, permissions, settings, and dependencies are present.
• The OpenShift installation plan, infrastructure readiness checklist, installation evidence, and recovery procedure connects each conclusion to objective, reviewable evidence.
• Normal processing, a boundary condition, dependency behavior, and the stated exception were tested.
• Corrections, ownership, retest criteria, rollback, documentation, and operational handover are complete.

Lesson Outcome

Learners can apply Installation Architecture, Infrastructure Prerequisites, DNS, and Load Balancing, explain the resulting platform behavior, and defend the outcome through the OpenShift installation plan, infrastructure readiness checklist, installation evidence, and recovery procedure.