TerraformintermediateTerraform
This cheat sheet covers practical Terraform usage for managing infrastructure as code.
Getting Started
2 topics
Install Terraform
Steps to install Terraform on your system.
# On macOS
brew install terraform
# On Ubuntu
sudo apt-get update && sudo apt-get install -y terraformEnsure your PATH includes Terraform binaries.
Verify installation using `terraform --version`.
Initialize a Terraform Project
How to set up a new Terraform project.
# Create a directory for your project
mkdir my-terraform-project
cd my-terraform-project
# Initialize Terraform
terraform initRun `terraform init` whenever you add new providers.
Keep your project organized with a `main.tf` file.
Basic Configuration
2 topics
Define a Provider
Specify the cloud provider for Terraform to use.
provider "aws" {
region = "us-east-1"
}Always specify the region to avoid unexpected behavior.
Use environment variables for sensitive data like credentials.
Create a Resource
Define a resource to provision infrastructure.
resource "aws_instance" "example" {
ami = "ami-0c55b159cbfafe1f0"
instance_type = "t2.micro"
}Use descriptive names for resources.
Check the AWS AMI IDs for your region.
State Management
2 topics
Understand Terraform State
Learn how Terraform tracks infrastructure state.
# Terraform state is stored in a file called 'terraform.tfstate'
# Example content:
{
"version": 4,
"resources": [
{
"type": "aws_instance",
"name": "example",
"instances": [
{
"attributes": {
"id": "i-0abcd1234efgh5678"
}
}
]
}
]
}Never manually edit the state file.
Use remote state for collaboration.
Remote State Configuration
Set up remote state storage for collaboration.
terraform {
backend "s3" {
bucket = "my-terraform-state"
key = "state/terraform.tfstate"
region = "us-east-1"
}
}Use versioning on your S3 bucket for state backups.
Secure your state file with encryption.
Variables and Outputs
2 topics
Define Variables
Use variables to make configurations reusable.
variable "instance_type" {
default = "t2.micro"
}
resource "aws_instance" "example" {
ami = "ami-0c55b159cbfafe1f0"
instance_type = var.instance_type
}Use `default` for optional variables.
Group variables in a `variables.tf` file.
Define Outputs
Expose useful information after applying Terraform.
output "instance_id" {
value = aws_instance.example.id
}Use outputs for debugging and integration.
Group outputs in an `outputs.tf` file.
Advanced Topics
2 topics
Modules
Organize Terraform configurations using modules.
module "ec2_instance" {
source = "./modules/ec2"
instance_type = "t2.micro"
ami = "ami-0c55b159cbfafe1f0"
}Use modules for reusable configurations.
Store modules in a `modules` directory.
Terraform Workspaces
Manage multiple environments using workspaces.
# Create a new workspace
terraform workspace new dev
# Switch to an existing workspace
terraform workspace select devUse workspaces for staging and production environments.
Workspace names should be descriptive.
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