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Developing Terraform Modules at Scale - HashiTalks 2021
- 2. Developing Terraform Modules at Scale Tom Straub (He/Him) Delivery Manager of Infrastructure Implementation Services
- 3. Rick Systems Architect Core Services Team Morty Application Developer Billing Team
- 4. I wrote some awesome Terraform Me too!
- 5. About Me Delivery Manager of Infrastructure Implementation Services at HashiCorp Tom Straub Terraform Enterprise Terraform since: 0.6.0 Nickname: Terraform Tom @straubt1 @terraform-tom
- 6. main.tf variables.tf outputs.tf What is a Module Spoiler alert: It’s just Terraform
- 7. main.tf module "object_storage" { source = "..." bucket_name = "my_bucket" } output "bucket_id" { value = module.object_storage .bucket_id } Module Reference main.tf variables.tf outputs.tf
- 8. main.tf module "object_storage" { source = "..." version = "=1.0.0" bucket_name = "my_bucket" } output "bucket_id" { value = module.object_storage .bucket_id } Module Reference
- 9. Producer Consumer Producer vs. Consumer main.tf variables.tf outputs.tf
- 13. How Many Resources? Variables Outputs Variables Outputs 1:1 1:∞ Goldilocks Principle
- 14. Blast Radius $ terraform destroy Key Considerations
- 15. Blast Radius $ terraform destroy Key Considerations Rate of Change $ terraform apply
- 16. Blast Radius $ terraform destroy Dependencies data "aws_vpc" "selected" {} Key Considerations Rate of Change $ terraform apply
- 21. Example Module Data lookup within module Example Module Code variable "vpc_name" {} data "aws_vpc" "main" { tags { Name = var.vpc_name } } resource "aws_security_group" "allow_tls" { vpc_id = data.aws_vpc.main.id name = "allow_tls" ... }
- 22. Example Module Module exposes a variable Example Module Code variable "vpc_id" {} resource "aws_security_group" "allow_tls" { name = "allow_tls" vpc_id = var.vpc_id ... } Dependency Injection Principle
- 23. Using Module Data lookup of Resource Root Module Code data "aws_vpc" "main" { tags { Name = "myTeamVPCName" } } module "example" { source = "./modules/example" vpc_id = data.aws_vpc.main.id }
- 24. Using Module Resource Create Root Module Code resource "aws_vpc" "main" { cidr_block = "10.0.0.0/16" } module "example" { source = "./modules/example" vpc_id = aws_vpc.main.id }
- 25. Using Module Variable pass-through Root Module Code variable "vpc_id" {} module "example" { source = "./modules/example" vpc_id = var.vpc_id }
- 29. Module Depth Root Module Code module "consul_cluster" { source = "" cluster_name = "my-cluster" } Consul Cluster module "consul_vpc" { source = "" name = var.cluster_name } module "consul_servers" { source = "" name = var.cluster_name } Consul VPC module "consul_sg" { source = "" name = var.name } Consul Servers resource "aws_autoscaling_group" "consul" { name = var.name }
- 31. Module Depth Consul Cluster module "consul_vpc" { source = "" name = var.cluster_name } module "consul_sg" { source = "" name = var.cluster_name vpc_id = module.consul_vpc.vpc_id } module "consul_servers" { source = "" name = var.cluster_name vpc_id = module.consul_vpc.vpc_id }
- 32. Version Your Modules ▪ PATCH version when you make backwards compatible bug fixes Example: Fix a typo ▪ MINOR version when you add functionality in a backwards compatible Example: Add a new feature ▪ MAJOR version when you make incompatible API changes Example: New behavior v1.0.0 Major Version Minor Version Patch Version
- 33. Module Upgrade Scenarios v1.0.0 v1.0.1 v1.1.0 v2.0.0
- 34. Module Version Constraints v1.0.0 v1.1.0 v2.0.0 v1.0.1 v1.1.1 v1.1.2 versions version = "= 1.0.0" version = "~> 1.0.0" version = "~> 1.1.0" version = ">= 2.0.0" module "object_storage" { source = "PMR" version = "???" } main.tf
- 36. Module Discoverability Where to find existing, new, updated modules Module Release Pipeline Automation, gates, releases are critical Module When Ready Do not over complicate early on Additional Thoughts on Scale So many things So little time