Container creation with Terraform

1

Terraform Installation

## Update packages
sudo apt update && sudo apt upgrade -y

## Install dependencies
sudo apt install -y wget unzip gpg

## Add GPG key
wget -O- https://apt.releases.hashicorp.com/gpg | gpg --dearmor | sudo tee /usr/share/keyrings/hashicorp-archive-keyring.gpg

## Add Hashicorp repository
echo "deb [signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] https://apt.releases.hashicorp.com $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/hashicorp.list

sudo apt update

## Terraform install
sudo apt install terraform -y

## Installation confirmation
terraform -v

2

Terraform first configurations

## Create workdir
mkdir terraform-workdir && cd terraform-workdir

## Create needed files 
touch main.tf && touch provider.tf && touch variables.tf && touch terraform.tfvars

3

Files content

provider.tf

provider.tf contains connections informations to APIs

terraform {
  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = ">= 3.0.0"
    }
  }
}
 
provider "azurerm" {
  features {}
 
  client_id       = var.azure_client_id
  client_secret   = var.azure_client_secret
  tenant_id       = var.azure_tenant_id
  subscription_id = var.azure_subscription_id
}

---

main.tf

This file contains the wanted infrastructure

data "azurerm_resource_group" "rg" {
  name     = "rg_mas-rrn"
}
 
resource "azurerm_container_group" "client1" {
  name                = "${var.dns_name_label}-website"
  location            = "westeurope"
  resource_group_name = data.azurerm_resource_group.rg.name
  os_type             = "Linux"
  dns_name_label      = var.dns_name_label
 
  image_registry_credential {
    server   = "index.docker.io"
    username = var.dockerhub_username
    password = var.dockerhub_password
  }
 
  container {
    name   = "company-hello-world"
    image  = "rht19/nginx-hello:latest"
    cpu    = "1"
    memory = "1.5"
 
    ports {
      port     = 80
      protocol = "TCP"
    }
  }
 
  ip_address_type = "Public"
  tags = {
    environment = "demo"
  }
}

---

variables.tf

This file define all the variables. With Terraform there is a difference with define a variable and set a value.

variable "azure_client_id" {}
variable "azure_client_secret" {}
variable "azure_tenant_id" {}
variable "azure_subscription_id" {}
variable "dockerhub_username" {}
variable "dockerhub_password" {}
variable "dns_name_label" {}

---

terraform.tfvars

This file contains variables with the associated values

azure_client_id       = "xxx"
azure_client_secret   = "xxx"
azure_tenant_id       = "xxx"
azure_subscription_id = "xxx"
dockerhub_username = "xxx"
dockerhub_password = "xxx"
dns_name_label = "clientName"

4

Terraform commands to launch creation

## Show what terraform understand with config files
terraform plan

## Apply infrastructure (--auto-approve replace "yes" later)
terraform apply -auto-approve

## Remove infrastructure
terraform destroy -auto-approve

## Show saved state (Terraform save state of an infrastructure in different files
terraform state list

## Remove saved state
terraform state rm <stateName>