DO080 – Containers, Kubernetes and Red Hat OpenShift Technical Overview — Lesson 1: Container Concepts, Images, Registries, Isolation, and Portability

Learning Objectives

• Interpret the architecture, dependencies, and expected behavior of container concepts, images, and registries.
• Apply process isolation and portability while preserving reviewable technical evidence.
• Recognize and correct the risk where a hidden prerequisite causes the first configuration step to produce an incomplete result.

Detailed Topics

• container concepts: apply the concept to a technology group assessing containers and OpenShift for application modernization, record the relevant settings or decisions, and explain the operational consequence.
• images: apply the concept to a technology group assessing containers and OpenShift for application modernization, record the relevant settings or decisions, and explain the operational consequence.
• registries: apply the concept to a technology group assessing containers and OpenShift for application modernization, record the relevant settings or decisions, and explain the operational consequence.
• process isolation: apply the concept to a technology group assessing containers and OpenShift for application modernization, record the relevant settings or decisions, and explain the operational consequence.
• portability: apply the concept to a technology group assessing containers and OpenShift for application modernization, record the relevant settings or decisions, and explain the operational consequence.

Instructor Demonstration

The instructor demonstrates container concepts, images, registries, isolation, and portability by tracing the relevant architecture, commands, configuration, messages, and evidence. The walkthrough highlights how a hidden prerequisite causes the first configuration step to produce an incomplete result and shows how to isolate the cause without masking dependent issues.

Hands-On Exercise

Build a baseline and capture the initial state for Container Concepts, Images, Registries, Isolation, and Portability. Add verified outcomes to the container platform assessment, workload suitability matrix, adoption risks, and next-step roadmap.

1. Confirm the scope, versions, access, dependencies, and success criteria.
2. Perform the workflow while recording commands, settings, output, and platform events.
3. Test one expected case and one controlled exception specific to this lesson.
4. Retest the correction and document ownership, rollback, and follow-up actions.

Scenario Analysis

• Identify which dependency most strongly influences container concepts in the stated scenario.
• Compare two approaches for process isolation and explain the security, reliability, and support trade-offs.
• Decide what evidence must be retained in the container platform assessment, workload suitability matrix, adoption risks, and next-step roadmap before operational acceptance.

Troubleshooting Guidance

Begin with the first observable difference from the expected result. Check architecture, access, dependencies, and starting conditions separately, then correlate logs, events, commands, and configuration history. Do not accept the initial assumption that a hidden prerequisite causes the first configuration step to produce an incomplete result; confirm the cause with a reproducible retest.

Validation Checklist

• The required architecture, access, dependencies, and starting conditions were checked and recorded.
• The normal path and a course-specific exception were tested.
• The container platform assessment, workload suitability matrix, adoption risks, and next-step roadmap links conclusions to commands, configuration, logs, or other objective evidence.
• Corrective actions, rollback steps, ownership, and handover notes are complete.

Lesson Outcome

Learners can apply Container Concepts, Images, Registries, Isolation, and Portability, explain the observed Red Hat platform behavior, and support the result with a reviewable container platform assessment, workload suitability matrix, adoption risks, and next-step roadmap.