DO188 – Red Hat OpenShift Development I: Introduction to Containers with Podman — Lesson 3: Storage, Networking, Environment, Ports, Pods, and Multi-Container Workloads

Learning Objectives

• Explain the structures, services, data, settings, roles, and dependencies governing container storage and networking.
• Implement and validate environment variables, ports, and pods using reviewable evidence.
• Evaluate the condition where operators cannot explain the outcome because logs, commands, settings, and acceptance evidence were not captured consistently and select a proportionate corrective response.

Detailed Topics

• container storage applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.
• networking applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.
• environment variables applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.
• ports applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.
• pods applied to the course scenario, expected platform behavior, dependencies, controls, and evidence.

Instructor Demonstration

The instructor traces a development team preparing secure container images and local workflows for deployment to OpenShift. The walkthrough connects navigation, commands, configuration logic, system messages, and evidence captured in the container image repository, Podman workflow record, security checks, and OpenShift deployment evidence. It also tests the exception where operators cannot explain the outcome because logs, commands, settings, and acceptance evidence were not captured consistently.

Hands-On Exercise

Complete a controlled Red Hat exercise covering Storage, Networking, Environment, Ports, Pods, and Multi-Container Workloads and preserve the verified result in the container image repository, Podman workflow record, security checks, and OpenShift deployment evidence.

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 container storage.
• Compare two defensible responses and explain technical, security, operational, and support trade-offs.
• Determine how the container image repository, Podman workflow record, security checks, and OpenShift deployment evidence 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 “operators cannot explain the outcome because logs, commands, settings, and acceptance evidence were not captured consistently” 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 container image repository, Podman workflow record, security checks, and OpenShift deployment evidence 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 Storage, Networking, Environment, Ports, Pods, and Multi-Container Workloads, explain the resulting platform behavior, and defend the outcome through the container image repository, Podman workflow record, security checks, and OpenShift deployment evidence.