terraform-module

# Terraform Module ## Instructions ### Step 1: Gather Requirements Ask: 1. What AWS resources are needed? (VPC, ECS, Lambda, RDS, S3, CloudFront) 2. What environment? (dev, staging, production, or multi-environment) 3. What compliance requirements? (encryption at rest, VPC isolation, logging) 4. Existing infrastructure to integrate with? (VPC ID, subnets, security groups) 5. State backend? (S3+DynamoDB, Terraform Cloud, local) ### Step 2: Module Structure Create the standard module layout: ``` modules/ my-service/ main.tf # Primary resource definitions variables.tf # Input variable declarations outputs.tf # Output value declarations versions.tf # Provider and terraform version constraints locals.tf # Local values and computed expressions data.tf # Data sources README.md # Module documentation ``` **versions.tf (always include):** ```hcl terraform { required_version = ">= 1.5" required_providers { aws = { source = "hashicorp/aws" version = "~> 5.0" } } } ``` ### Step 3: Variable Definitions Define variables with descriptions, types, and validation: ```hcl variable "environment" { description = "Deployment environment (dev, staging, production)" type = string validation { condition = contains(["dev", "staging", "production"], var.environment) error_message = "Environment must be dev, staging, or production." } } variable "service_name" ...