55 ‐ Terraform – Creating an OCI VCN with Internet Gateway - SanjeevOCI/Ocidocs GitHub Wiki

This lab demonstrates how to create a Virtual Cloud Network (VCN) in Oracle Cloud Infrastructure (OCI) using Terraform and attach an Internet Gateway for public access.

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1. Get the VCN Creation Template

Go to Terraform Provider OCI Docs
and search for oci_core_vcn to get the VCN creation template.

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2. Navigate to Code Editor

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3. Write Terraform Code to Create a VCN

Create a new directory for your Terraform project and add the following files:

a. main.tf

provider "oci" {
  region = "us-ashburn-1" // Replace with your desired region
}

resource "oci_core_vcn" "example_vcn" {
  cidr_block     = "10.0.0.0/16"
  display_name   = "example-vcn"
  compartment_id = "ocid1.compartment.oc1..exampleuniqueID" // Replace with your compartment OCID
  dns_label      = "examplevcn"
}

b. variables.tf (Optional)

Define variables for reusability:

variable "compartment_id" {
  description = "The OCID of the compartment where the VCN will be created"
  type        = string
}

variable "region" {
  description = "The OCI region"
  type        = string
  default     = "us-ashburn-1"
}

variable "vcn_cidr" {
  description = "The CIDR block for the VCN"
  type        = string
  default     = "10.0.0.0/16"
}

c. outputs.tf

Output the VCN details after creation:

output "vcn_id" {
  value = oci_core_vcn.example_vcn.id
}

output "vcn_cidr_block" {
  value = oci_core_vcn.example_vcn.cidr_block
}

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4. Initialize Terraform

Run the following commands in your terminal from the project directory:

1. Initialize Terraform:

   terraform init
   

2. Validate the Configuration:

   terraform validate
   

3. Preview the Changes:

   terraform plan -var="compartment_id=<your_compartment_ocid>"
   

4. Apply the Configuration:

   terraform apply -var="compartment_id=<your_compartment_ocid>"
   

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5. Verify the VCN

After applying the configuration, you can:

• Check the output in the terminal for the VCN ID and CIDR block.
• Log in to the OCI Console and navigate to Networking > Virtual Cloud Networks to verify the VCN.

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6. Clean Up (Optional)

To delete the VCN and associated resources:

terraform destroy -var="compartment_id=<your_compartment_ocid>"

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