Deploying AWS CodeDeploy with Terraform

Introduction:

AWS CodeDeploy is a powerful service that automates application deployments to #Amazon EC2 instances, on-premises instances, and serverless #Lambda functions. By using #Terraform, an #infrastructure-as-code tool, you can simplify and streamline the process of #deploying #CodeDeploy resources.

Step 1: Prerequisites Before we begin, make sure you have the following prerequisites:

1. An AWS account with appropriate permissions to create CodeDeploy resources.

2. Terraform installed on your local machine.

3. AWS CLI configured with your AWS credentials.

Step 2: Setting Up Your #Terraform Configuration Files Create three files: main.tf, variable.tf, and output.tf. Open your preferred text editor and create these files.

Step 3: Writing the Terraform Code Now, let’s dive into the main.tf file and start writing our #Terraform code. In this file, we'll configure the #AWS provider and define the #CodeDeploy resources required for our deployment. Here's an example of how you can define the CodeDeploy application, deployment group, and deployment configuration:

provider "aws" {
  region = "us-east-1"  # Replace with your desired AWS region
}

resource "aws_codedeploy_app" "my_app" {
  name = var.application_name
}

resource "aws_codedeploy_deployment_group" "my_deployment_group" {
  app_name               = aws_codedeploy_app.my_app.name
  deployment_group_name  = var.deployment_group_name
  service_role_arn       = "arn:aws:iam::123456789012:role/CodeDeployServiceRole"  # Replace with your service role ARN
  deployment_config_name = var.deployment_config_name

  auto_rollback_configuration {
    enabled         = true
    events          = ["DEPLOYMENT_FAILURE"]
    rollback_triggers = [{
      arn  = aws_codedeploy_app.my_app.arn
      type = "HEALTH"
    }]
  }
}

# Add any additional CodeDeploy resources as needed

Step 4: Defining Input Variables In the variable.tf file, define the input variables needed for your #CodeDeploy deployment. These variables will allow you to customise your deployment based on your application’s requirements. Here’s an example of how you can define some essential variables:

variable "application_name" {
  description = "Name of the CodeDeploy application"
  type        = string
}

variable "deployment_group_name" {
  description = "Name of the CodeDeploy deployment group"
  type        = string
}
variable "deployment_config_name" {
  description = "Name of the CodeDeploy deployment configuration"
  type        = string
}
# Add any additional variables as needed

Step 5: Defining Outputs In the output.tf file, define the outputs you want to retrieve after deploying the #CodeDeploy resources. These outputs can include information such as the #CodeDeploy application ARN, deployment group ARN, or any other relevant details.

output "application_arn" {
  value = aws_codedeploy_app.my_app.arn
}

output "deployment_group_arn" {
  value = aws_codedeploy_deployment_group.my_deployment_group.arn
}

# Add any additional outputs as needed

Step 6: Deploying CodeDeploy Resources Now that we have defined our Terraform code, it’s time to deploy our CodeDeploy resources. Follow these steps:

1. Open a terminal or command prompt and navigate to the directory where your Terraform files are located.

2. Run the following command to initialise the Terraform configuration:

terraform init

This command downloads the necessary provider plugins and sets up the backend for storing the Terraform state.

1. Next, run the command to validate the Terraform configuration:

terraform validate

This command ensures that the syntax and structure of your Terraform code are correct.

1. Run the following command to see the execution plan and confirm the resources that Terraform will create:

terraform plan

Review the plan to ensure that it aligns with your expectations. It will show you the changes that Terraform will make to create or modify resources.

1. If the plan looks good, proceed to apply the changes by running the following command:

terraform apply

You will be prompted to confirm the deployment. Type “yes” and press Enter to proceed.

1. Terraform will now create the CodeDeploy resources based on your configuration. This process may take a few moments. Once completed, you will see the outputs defined in the output.tf file, such as the application ARN and deployment group ARN.

Congratulations! You have successfully deployed CodeDeploy resources using Terraform.

Step 7: Cleaning Up (Optional) If you want to remove the deployed CodeDeploy resources and destroy the infrastructure, follow these steps:

1. In the same terminal or command prompt, run the following command:

terraform destroy

You will be prompted to confirm the destruction of the resources. Type “yes” and press Enter to proceed.

1. Terraform will destroy the #CodeDeploy resources and any other resources defined in your #Terraform configuration.

Conclusion:

In this guide, we learned how to deploy #CodeDeploy resources using Terraform. By following the step-by-step instructions, you gained the ability to automate your application deployments with ease and maintain consistency across environments. Terraform’s infrastructure-as-code approach allows for version-controlled, repeatable deployments, making it a powerful tool for managing your #AWS infrastructure.