Terraform AWS - ECS with Auto Scaling Group

This Terraform project was developed for the creation of an ECS cluster with High Availability, it includes an S3 section with CloudFront.

Diagram

Environments

Inside of this directory, you could find the Profiles in which you can specify how they must be configured, is highly recommend have the templates folder in which you could save Keys, Scripts or other files that you could need. Also, you have to create the file terraform.tfvars that will contain all the values to be used in the environment, these values are really highly sensitives for this reason never had been inside of repositories, always must to be added in the .gitignore file.

The main.tf file is the profile that indicates what, how and how many resources will be created. Iside of the variables.tf you could see which variables do you need, some of them have default values these could be optional, all other variables that not include default values are required.

Modules

Based on the official Amazon repositories these modules was reworked in order to make them more flexibles and easy to understand. There is one module specific for each important section or element in the infrastructure and could be re-utilized multiple times.

Execution

In order to execute the Terraform script you have to move into the Environment directory and then type the next commands in the Terminal.

The command init load the source of the modules from the directory or the repositories.

NOTE: This command also could be used to check the syntaxis.

terraform init

Throuth the plan command you can check what changes will be applied before to apply the changes.

terraform plan

Finally you have to type the command apply to execute the changes on the AWS environment, before to apply the changes it will request for approval and show you a similar output that the plan command.

terraform apply

Terraform Backend

In order to colaborate with others people you have to define a backend file inside of the environment directory. Using the file backend.tf with the next content.

terraform {
  required_version = ">= 0.10.3"

  backend "s3" {
    encrypt = true
    bucket = "bucket-name"
    dynamodb_table = "terraform-state-lock-dynamo"
    key = "PROJECT/terraform-develop.tfstate"
    region = "us-west-2"
  }
}

Use this file will allow work in team trough the creation of the shared .tfstate file that save the current state of the infrastructure and the DynamoDB Table avoid that the people execute changes in the infrastructure at the same time causing corruption in the environment.

Requirements

• AWS SSL Certificate (optional)
• AWS Access Key
• AWS Secret Key

Resources

• Application Load Balancer (ALB)
• Target Groups (TG)
• Security Groups (SG)
• Elastic Compute Cloud (EC2)
• Auto Scaling Groups (ASG)
• Launch Configuration (LC)
• Elastic Container Service (ECS)
• Elastic Container Registry (ECR)
• Regional Database (RDS)
• Simple Storage Service (S3)
• Virtual Private Cloud (VPC)
• Virtual Private Network (VPN)
• Subnets
• Internet Gateway
• NAT Gateway
• Routing Tables