Oracle Linux: System Administration on Oracle Cloud Infrastructure Ed 2 LVC — Lesson 3: VCN Connectivity, DNS, firewalld, SELinux, Time, and Remote Administration

Learning Objectives

• Assess how vcn connectivity, dns, firewalld, selinux, time, and remote administration changes application behaviour, data, accounting, or service delivery.
• Operate a repeatable sequence with known inputs, controls, outputs, and rollback points.
• Resolve security, correctness, performance, recoverability, and support readiness.

Detailed Topics

• VCN Connectivity
• DNS
• firewalld
• SELinux
• Time
• Remote Administration
• ownership, prerequisites, data, and acceptance criteria for vcn connectivity, dns, firewalld, selinux, time, and remote administration
• security, control, integration, performance, recovery, and support implications

Instructor Demonstration

Demonstrate vcn connectivity, dns, firewalld, selinux, time, and remote administration within an Oracle Linux instance provisioned on OCI, secured, patched, connected, monitored, and handed over for production use. Use representative data and capture network diagnostics, SELinux events so another practitioner can verify the result.

Hands-On Exercise

Complete a controlled Oracle Linux: System Administration on Oracle Cloud Infrastructure Ed 2 LVC activity focused on vcn connectivity, dns, firewalld, selinux, time, and remote administration. Introduce a realistic case of storage exhaustion, isolate its cause, apply a reversible correction, and rerun the acceptance checks.

1. Record the requirement, environment, identities, dependencies, data, controls, and expected result.
2. Perform the workflow and capture course-specific evidence before and after each material change.
3. Test normal, boundary, failure, security, reconciliation, recovery, and operational conditions.
4. Document the root cause, correction, rollback, owner, support action, and next improvement priority.

Scenario Analysis

• Separate mandatory requirements from optional convenience and local workaround requests.
• Compare the proposed approach against security, reliability, usability, cost, and audit expectations.
• Select the smallest supportable change and assign follow-up ownership.

Troubleshooting Guidance

When vcn connectivity, dns, firewalld, selinux, time, and remote administration does not produce the expected result, confirm scope, effective dates, identities, data context, dependencies, and recent changes. Review the most relevant network diagnostics, SELinux events before editing configuration. Test one reversible hypothesis at a time, verify recovery, and confirm that the fix does not create storage exhaustion elsewhere.

Validation Checklist

• Prerequisites, ownership, data context, settings, and expected outcomes are documented.
• The result is reproducible and supported by network diagnostics, SELinux events.
• Security, controls, data quality, integration, performance, recovery, and support conditions are reviewed.
• Exceptions, corrective action, rollback, approvals, monitoring, and handover are recorded.

Lesson Outcome

Learners can apply VCN Connectivity, DNS, firewalld, SELinux, Time, and Remote Administration in a realistic Oracle Linux: System Administration on Oracle Cloud Infrastructure Ed 2 LVC situation and defend the result with course-specific evidence.