Terraform and Docker

Task 1

Create a Terraform script with Blocks and Resources

  terraform {
    required_providers {
      docker = {
        source  = "kreuzwerker/docker"
        version = "~> 2.21.0"
      }
    }
  }

Note: kreuzwerker/docker, is shorthand for registry.terraform.io/kreuzwerker/docker.

Provider Block

The provider block configures the specified provider, in this case, docker. A provider is a plugin that Terraform uses to create and manage your resources.

provider "docker" {}

Resource

Use resource blocks to define components of your infrastructure. A resource might be a physical or virtual component such as a Docker container, or it can be a logical resource such as a Heroku application.

Resource blocks have two strings before the block: the resource type and the resource name. In this example, the first resource type is docker_image and the name is Nginx.

Task 2

Create a resource Block for an nginx docker image

  resource "docker_image" "nginx" {
   name         = "nginx:latest"
   keep_locally = false
  }

Create a resource Block for running a docker container for Nginx
```
  resource "docker_container" "nginx" {
   image = docker_image.nginx.name
   name  = "tutorial"
   ports {
     internal = 80
     external = 81
   }
  }
```
Note: In case Docker is not installed

sudo apt-get install docker.io
sudo docker ps
sudo chown $USER /var/run/docker.sock
Now the terraform configuration file is created, So we will initialize the terraform using the terraform init command.
Run terrafrom validate to validate the files.
Run the terraform plan command to see the execution plan of Terraform configuration.
Apply the Terraform configuration to create and start the Docker container.
After Terraform completes, we can verify that the Docker container is running by checking the Docker processes.