RH354 – Red Hat Enterprise Linux 8 New Features for Experienced Linux Administrators — Lesson 1: RHEL 8 Platform Changes, Application Streams, DNF, Repositories, and Software

Learning Objectives

• Interpret the architecture, dependencies, and expected behavior of platform changes, application streams, and DNF.
• Apply repositories and software lifecycle 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

• platform changes: apply the concept to an experienced Linux administrator updating operational practices for an RHEL 8 estate, record the relevant settings or decisions, and explain the operational consequence.
• application streams: apply the concept to an experienced Linux administrator updating operational practices for an RHEL 8 estate, record the relevant settings or decisions, and explain the operational consequence.
• DNF: apply the concept to an experienced Linux administrator updating operational practices for an RHEL 8 estate, record the relevant settings or decisions, and explain the operational consequence.
• repositories: apply the concept to an experienced Linux administrator updating operational practices for an RHEL 8 estate, record the relevant settings or decisions, and explain the operational consequence.
• software lifecycle: apply the concept to an experienced Linux administrator updating operational practices for an RHEL 8 estate, record the relevant settings or decisions, and explain the operational consequence.

Instructor Demonstration

The instructor demonstrates rhel 8 platform changes, application streams, dnf, repositories, and software 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 RHEL 8 Platform Changes, Application Streams, DNF, Repositories, and Software. Add verified outcomes to the RHEL 8 feature comparison, updated administration procedures, compatibility checklist, and adoption plan.

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 platform changes in the stated scenario.
• Compare two approaches for repositories and explain the security, reliability, and support trade-offs.
• Decide what evidence must be retained in the RHEL 8 feature comparison, updated administration procedures, compatibility checklist, and adoption plan 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 RHEL 8 feature comparison, updated administration procedures, compatibility checklist, and adoption plan 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 RHEL 8 Platform Changes, Application Streams, DNF, Repositories, and Software, explain the observed Red Hat platform behavior, and support the result with a reviewable RHEL 8 feature comparison, updated administration procedures, compatibility checklist, and adoption plan.