Terraform needs to be told which provider to be used in the automation, hence we need to give the provider name with source and version. For Docker, we can use this block of code in your main.tf

Blocks and Resources in Terraform

Task-01

• Create a Terraform script with Blocks and Resources using terraform.tf file.Before that we need to install docker in our system.

sudo apt-get install docker.io -y && sudo apt-get install docker-compose -y && sudo chown $USER /var/run/docker.sock

• Create a file terraform.tf and write the providers of dockers

terraform {
  required_providers {
    docker = {
      source  = "kreuzwerker/docker"
      version = "~> 3.0.0"
}
}
}

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. for that we need a file like providers.tf or main.tf in this case we use main.tf

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-02

• Create a resource Block for an nginx docker image in main.tf

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

• Create a resource Block for running a docker container for nginx in main.tf

resource "docker_container" "nginx-ctr" {
    name = "nginx_container"
    image = docker_image.nginx-image.name
    ports {
        internal = 80
        external = 80
    }
}

• After completing all the steps mentioned in Day 61's blog, we can use a command to run our Docker container with our IP address using the Nginx port number.

terraform init

terraform plan

terraform apply

docker ps

• Now, copy your IP address from your AWS console and paste it into a new tab with port number 80.

I Hope this blog will help you understand how to write a basic Terraform configuration file like main.tf and terraform.tf details and basic commands on Terraform.

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Happy Learning

Thanks For Reading! :)

-SriParthu💝💥