Terraform with Docker
Create main.tf Terraform config file
terraform {
required_providers {
docker = {
source = "kreuzwerker/docker"
version = "~> 3.0.1"
}
}
}
provider "docker" {}
resource "docker_image" "nginx" {
name = "nginx"
keep_locally = false
}
resource "docker_container" "nginx" {
image = docker_image.nginx.image_id
name = "tutorial"
ports {
internal = 80
external = 8000
}
}
# Initialize the project, which downloads a plugin called a provider that lets Terraform interact with Docker.
terraform init
# Provision the NGINX server container with apply. Type 'yes' to confirm.
terraform apply
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
425d5ee58619 e791337790a6 "nginx -g 'daemon of…" 20 seconds ago Up 19 seconds 0.0.0.0:8000->80/tcp tutorial
# To stop the container, run terraform destroy.
terraform destroy
Terraform with Azure
# Login to azure
az login
# set az subscription
az account set --subscription "35akss-subscription-id"
# create service principal
az ad sp create-for-rbac --role="Contributor" --scopes="/subscriptions/<SUBSCRIPTION_ID>"
# Set your environment variables
export ARM_CLIENT_ID="<APPID_VALUE>"
export ARM_CLIENT_SECRET="<PASSWORD_VALUE>"
export ARM_SUBSCRIPTION_ID="<SUBSCRIPTION_ID>"
export ARM_TENANT_ID="<TENANT_VALUE>"
# Write configuration
mkdir learn-terraform-azure; cd learn-terraform-azure
# Configure the Azure provider
terraform {
required_providers {
azurerm = {
source = "hashicorp/azurerm"
version = "~> 3.0.2"
}
}
required_version = ">= 1.1.0"
}
provider "azurerm" {
features {}
}
resource "azurerm_resource_group" "rg" {
name = "myTFResourceGroup"
location = "westus2"
}
Explanation
Terraform Block
The
terraform{} block contains Terraform settings, including the required providers Terraform will use to provision your infrastructure.
Providers Block
The
providerblock configures the specified provider, in this case azurerm. A provider is a plugin that Terraform uses to create and manage your resources.
Resource Block
Use
resourceblocks to define components of your infrastructure. A resource might be a physical component such as a server, or it can be a logical resource such as a Heroku application.
Resource blocks have two strings before the block: the resource type (azurerm_resource_group) and the resource name (rg).azurermis the prefix to specify provider.azurerm_resource_group.rgis the full resource ID.
Format and validate the configuration
# Format terreform config file
terraform fmt
# validate the config
terraform validate
# apply config. Type 'yes' to confirm the changes
terraform apply
# Inspect your state
# When you apply your configuration, Terraform writes data into a file called terraform.tfstate.
# This file contains the IDs and properties of the resources Terraform created
# Your state file contains **sensitive values in plaintext**
terraform show
> resource "azurerm_resource_group" "rg" {
> id = "/subscriptions/c9ed8610-47a3-4107-a2b2-a322114dfb29/resourceGroups/myTFResourceGroup"
> location = "westus2"
> name = "myTFResourceGroup"
> }
To review the information in your state file, use the state command.
$ terraform state list
$ terraform state
$ terraform destroy
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