Terraform.md

TerraForm

1. Create "n" nos of clould apps ,Online Apps , Link and Configure
2. InfraStructure as Code (IAC)

Files Structure :

Pre-Req :

• main.tf - Main File
• dependencies.tf (depends_on) - Pre-Req
• required_providers.tf - Download Interface communicate to target
• providers.tf - Configure required_providers

Declaration :

• variables.tf - Declare input paramters

• terraform.auto.tfvars - Pass values to variables.tf

• locals.tf - Local variables for internal Calculations

• data.tf - Used to read from File

• outputs.tf - Print Output

Operations

1. data : get information from existing resources
2. resource : Smallest operation which can be performed
3. module : Function Call

Sample Code

Pre-Req: Docker is running locally

# Terraform Interface for Docker
terraform {
  required_providers {
    docker = { source = "kreuzwerker/docker" }
  }
}

# Use Default Config for above docker
provider "docker" {}

# Download nginx Image
resource "docker_image" "nginx" {
  name = "nginx"
}

# Define a map of container configurations
locals {
  containers = {
    c1 = { external_port = 8001 },
    c2 = { external_port = 8002 }
  }
}

# Create Nginx containers using a map
resource "docker_container" "nginx" {
  for_each = local.containers

  image = docker_image.nginx.image_id
  name  = each.key  # Unique name for each container

  ports {
    internal = 80
    external = each.value.external_port  # Use the external port from the map
  }
}

# Outputs
output "container_names" {
  value = [for c in docker_container.nginx : c.name]
}