DO400 – Red Hat DevOps Pipelines and Processes: CI/CD with Jenkins, Git, and Test Driven Development — Lesson 3: Jenkins Architecture, Jobs, Declarative Pipelines, Artifacts, and Credentials

Learning Objectives

• Evaluate integration, security, resilience, performance, and exceptions affecting Jenkins architecture, pipeline syntax, and build stages.
• Apply artifacts and credentials 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

• Jenkins architecture: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• pipeline syntax: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• build stages: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• artifacts: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.
• credentials: apply the concept to the course scenario, identify dependencies and controls, and record objective evidence of the result.

Instructor Demonstration

The instructor demonstrates jenkins architecture, jobs, declarative pipelines, artifacts, and credentials 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 Jenkins Architecture, Jobs, Declarative Pipelines, Artifacts, and Credentials and add the verified result to the Git-based application repository, automated test suite, Jenkins pipeline, deployment evidence, and support guide.

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 Jenkins architecture in the stated scenario.
• Compare two approaches for artifacts and explain the security, reliability, performance, and support trade-offs.
• Decide what evidence must be retained in the Git-based application repository, automated test suite, Jenkins pipeline, deployment evidence, and support guide 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 Git-based application repository, automated test suite, Jenkins pipeline, deployment evidence, and support guide 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 Jenkins Architecture, Jobs, Declarative Pipelines, Artifacts, and Credentials, explain the observed platform behavior, and support the result with a reviewable Git-based application repository, automated test suite, Jenkins pipeline, deployment evidence, and support guide.