Automating Infrastructure Deployment with OCI Terraform

In this blog, we will delve into automating the deployment of Oracle Cloud Infrastructure (OCI) resources using Terraform. We will cover setting up Terraform, writing infrastructure as code, and managing OCI resources efficiently.

Configuration Steps

1. Install Terraform:
   • Download and install Terraform from the official website.
   • Verify installation using the terraform -version command.
2. Set Up OCI CLI:
   • Install OCI CLI and configure with your credentials.
   • Example command to set up the CLI:

oci setup config

Create Terraform Configuration File:

• Create a directory for your Terraform project.
• Define provider settings in a provider.tf file:

provider "oci" {
  tenancy_ocid = "<your_tenancy_ocid>"
  user_ocid    = "<your_user_ocid>"
  fingerprint  = "<your_api_key_fingerprint>"
  private_key_path = "<path_to_your_private_key>"
  region       = "<your_region>"
}

3. Writing Terraform Configurations

Defining Resources

• Example configuration for creating a Virtual Cloud Network (VCN):

resource "oci_core_vcn" "example_vcn" {
  cidr_block = "10.0.0.0/16"
  display_name = "example_vcn"
  compartment_id = "<your_compartment_ocid>"
}

Organizing Configurations

• Use modules for reusability and better organization.
• Example module structure:

modules/
  vcn/
    main.tf
    variables.tf
    outputs.tf
main.tf
variables.tf
outputs.tf

Deploying OCI Resources with Terraform

Initialize Terraform

• Run terraform init to initialize the configuration.

Plan Deployment

• Use terraform plan to preview the changes:

terraform plan

Apply Configuration

• Deploy the resources using terraform apply:

terraform apply

Managing and Updating Resources

Updating Resources

• Modify the configuration files as needed.
• Apply changes with terraform apply.

Destroying Resources

• Clean up resources with terraform destroy:

terraform destroy

Implementing Terraform Best Practices

• Use remote state storage for collaboration.
• Implement state locking to prevent concurrent modifications.

Regards
Osama