DO328 Building Resilient Microservices with Istio and Red Hat OpenShift Service Mesh — Lesson 1: Service Mesh Architecture, Istio Components, Sidecars, Data Plane, and Control Plane

Learning Objectives

• Interpret the architecture, dependencies, and expected behavior of service mesh architecture, Istio components, and sidecars.
• Apply data plane and control plane 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

• service mesh architecture: apply the concept to a platform and development team improving reliability and visibility for distributed microservices, record the relevant settings or decisions, and explain the operational consequence.
• Istio components: apply the concept to a platform and development team improving reliability and visibility for distributed microservices, record the relevant settings or decisions, and explain the operational consequence.
• sidecars: apply the concept to a platform and development team improving reliability and visibility for distributed microservices, record the relevant settings or decisions, and explain the operational consequence.
• data plane: apply the concept to a platform and development team improving reliability and visibility for distributed microservices, record the relevant settings or decisions, and explain the operational consequence.
• control plane: apply the concept to a platform and development team improving reliability and visibility for distributed microservices, record the relevant settings or decisions, and explain the operational consequence.

Instructor Demonstration

The instructor demonstrates service mesh architecture, istio components, sidecars, data plane, and control plane 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 Service Mesh Architecture, Istio Components, Sidecars, Data Plane, and Control Plane. Add verified outcomes to the service mesh configuration, traffic policy tests, observability evidence, and resilience runbook.

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 service mesh architecture in the stated scenario.
• Compare two approaches for data plane and explain the security, reliability, and support trade-offs.
• Decide what evidence must be retained in the service mesh configuration, traffic policy tests, observability evidence, and resilience runbook 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 service mesh configuration, traffic policy tests, observability evidence, and resilience runbook 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 Service Mesh Architecture, Istio Components, Sidecars, Data Plane, and Control Plane, explain the observed Red Hat platform behavior, and support the result with a reviewable service mesh configuration, traffic policy tests, observability evidence, and resilience runbook.