Terraform with Oracle Cloud — Lesson 2: VCN, Subnets, Gateways, Security, and Connectivity

Technical Scope

• VCN and subnet CIDR design
• Route tables, internet, NAT, and service gateways
• Security lists and network security groups
• DNS, private access, and connectivity tests

Instructor Demonstration

Create a VCN with public and private subnets and controlled egress.

Applied Workshop

Design an OCI network for an application and managed database connection.

1. Translate the scenario into configuration, access, state, pipeline, or module decisions.
2. Implement the change in a controlled workspace or repository.
3. Capture the plan, logs, outputs, policy results, and post-change checks.
4. Explain one safer or more maintainable alternative and its trade-off.

Validation Standard

Routing and security permit only the documented flows.

• The intended target, identity, environment, and state boundary are confirmed.
• The plan or execution evidence contains no unexplained destructive action.
• Security, reliability, maintainability, and operational ownership are reviewed.
• The final result can be reproduced from version-controlled inputs.

Failure Analysis

Resolve route, gateway, security, DNS, subnet, and overlapping-range issues.

Learners isolate the smallest verified cause, correct it, rerun the relevant validation step, and record the preventive action in the course improvement log.