Day 62 : Terraform and Docker 🔥

In today's rapidly evolving technological landscape, automation has become a cornerstone of efficiency and scalability. Among the plethora of tools available, Terraform and Docker stand out as powerful allies in building, deploying, and managing infrastructure. Let's delve into how these tools can be seamlessly integrated to streamline your automation workflows.

Terraform: Defining Infrastructure as Code

Terraform is an Infrastructure as Code (IaC) tool that allows you to define and provision infrastructure using declarative configuration files. Central to Terraform's functionality is the concept of providers, which are plugins that interface with various cloud platforms and services.

Task-01

Create a Terraform script with Blocks and Resources

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

This is a Terraform configuration block specifying the required Docker provider and its version.

In this configuration, you are specifying that your Terraform code requires the Docker provider to interact with Docker containers. The source parameter specifies the location of the provider code, which in this case is the kreuzwerker/docker GitHub repository. The version parameter specifies the minimum version of the provider that should be used.

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-02

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.latest
 name  = "tutorial"
 ports {
   internal = 80
   external = 80
 }
}

After creating a Terraform configuration file (with a .tf extension), use the following Terraform commands to provision and manage your infrastructure:

Terraform init: Initializes a new or existing Terraform working directory by downloading and installing any required providers and modules, initializing the backend, and downloading any necessary plugins.

Terraform plan: Generates an execution plan that shows what actions Terraform will take to reach the desired state specified in the configuration file. This command also reports any changes that will be made to the infrastructure.

terraform plan

Terraform apply: Executes the actions proposed in the execution plan generated by terraform plan. This command provisions and configures the infrastructure defined in the configuration file.

terraform apply

Browse public IP address, you can see the Nginx default page.

Conclusion

Integrating Terraform and Docker empowers you to automate infrastructure provisioning and container deployment with precision and ease. By defining infrastructure as code and leveraging containerization, you can achieve greater agility, scalability, and consistency in your development and deployment workflows.

I'm confident that this article will prove to be valuable, helping you discover new insights and learn something enriching .

thank you : )