Last Updated: November 21, 2025
Terraform
Infrastructure as Code tool
Core Concepts
| Item | Description |
|---|---|
Provider
|
Plugin for cloud/service API |
Resource
|
Infrastructure component |
Module
|
Reusable configuration |
State
|
Current infrastructure mapping |
Variable
|
Input parameter |
Output
|
Exported value |
Data Source
|
Read-only external data |
Common Commands
terraform init
Initialize working directory
terraform plan
Preview changes
terraform apply
Create/update infrastructure
terraform destroy
Remove all resources
terraform fmt
Format configuration files
terraform validate
Check configuration syntax
Configuration Example
# Provider configuration
provider "aws" {
region = "us-east-1"
}
# VPC resource
resource "aws_vpc" "main" {
cidr_block = "10.0.0.0/16"
tags = {
Name = "main-vpc"
}
}
# EC2 instance
resource "aws_instance" "web" {
ami = "ami-0c55b159cbfafe1f0"
instance_type = "t2.micro"
tags = {
Name = "web-server"
}
}
# Output values
output "instance_ip" {
value = aws_instance.web.public_ip
}Best Practices
- Use remote state with locking
- Organize code with modules
- Use workspaces for multiple environments
- Always run terraform plan before apply
💡 Pro Tips
Quick Reference
Use terraform workspaces to manage multiple environments