Terraform Skill

PURPOSE

Infrastructure provisioning with declarative configuration.

CORE COMPETENCIES

Core Concepts:
├── Resources & Data Sources
├── Variables & Outputs
├── State management
├── Modules
└── Workspaces

Providers:
├── AWS
├── GCP
├── Azure
├── Kubernetes
└── Helm

CODE PATTERNS

Module Structure

# modules/vpc/main.tf
resource "aws_vpc" "main" {
  cidr_block           = var.cidr_block
  enable_dns_hostnames = true

  tags = merge(var.tags, {
    Name = var.name
  })
}

# modules/vpc/variables.tf
variable "name" {
  type        = string
  description = "VPC name"
}

variable "cidr_block" {
  type        = string
  default     = "10.0.0.0/16"
  validation {
    condition     = can(cidrhost(var.cidr_block, 0))
    error_message = "Must be valid CIDR block."
  }
}

# modules/vpc/outputs.tf
output "vpc_id" {
  value       = aws_vpc.main.id
  description = "VPC ID"
}

Remote State

terraform {
  backend "s3" {
    bucket         = "terraform-state"
    key            = "prod/terraform.tfstate"
    region         = "us-east-1"
    encrypt        = true
    dynamodb_table = "terraform-locks"
  }
}

TROUBLESHOOTING

COMMANDS

terraform init
terraform plan -out=tfplan
terraform apply tfplan
terraform destroy

# State
terraform state list
terraform state show resource
terraform import resource.name id