acdl/modules/l1/vpc/README.md

vpc — VPC with subnets and routing

Module kind: primitive | Version: 1.0.0

A VPC with one subnet per availability zone and a route table with a default route through an internet gateway. The networking foundation that other modules (ALB, ECS service) reference for subnet ids.

Resources

Resource	Type	Purpose
vpc	aws_vpc	The VPC itself
subnet	aws_subnet	One subnet per availability zone
route_table	aws_route_table	Route table with default route 0.0.0.0/0
internet_gateway	aws_internet_gateway	IGW for public internet access
route_table_association	aws_route_table_association	Binds subnet to route table

Inputs

Name	Type	Required	Default	Description
cidr	string	yes	—	VPC CIDR block, e.g. 10.0.0.0/16
azs	string	yes	—	Comma-separated availability zones, e.g. us-east-1a,us-east-1b
name	string	yes	—	Name tag for the VPC and child resources
region	string	yes	—	AWS region the VPC is created in

Outputs

Name	Type	Description
vpc_id	string	The VPC id
subnet_ids	string	Comma-separated subnet ids

Usage

{
  "id": "vpc",
  "type": "aws:ec2:vpc",
  "module": "vpc@1.0.0",
  "inputs": {
    "cidr": "10.0.0.0/16",
    "azs": "us-east-1a,us-east-1b",
    "name": "acdl-microservice",
    "region": "us-east-1"
  }
}

The azs input is split on comma; one subnet is created per zone. The route table gets a default route 0.0.0.0/0 → internet gateway. Other modules reference subnet_ids for their network placement.

Compliance extension points

• VPC Flow Logs — add aws_flow_log + CloudWatch Logs group / S3 destination (SOX ITGC, SOC2 CC7.2, DORA ICT risk logging).
• Private subnets + NAT gateway — add private subnets with a NAT gateway so ECS tasks don't need public IPs (SOC2 CC6.6, PCI-DSS 1.3, network isolation).
• VPC endpoints — add S3, ECR, KMS, DynamoDB, CloudWatch interface/gateway endpoints to keep traffic off the public internet (SOC2 CC6.7, GDPR Art.32(1)(a), DORA ICT third-party risk).
• Security groups — add aws_security_group as a first-class sub-resource (currently missing; needed for all regulated deployments) (SOC2 CC6.6, PCI-DSS 1.2).
• Network ACLs — add aws_network_acl for subnet-level segmentation (PCI-DSS 1.3).

Examples

Validated example contracts are in examples/. The platform-test pipeline validates them against schemas/contract.schema.json.

Simple

A minimal deployment:

examples/simple.yaml

uses: acdl/pipelines/deploy.yaml@v1.6
module: vpc
environment: dev
inputs:
  cidr: 10.0.0.0/16
  azs: us-east-1a,us-east-1b
  name: my-vpc
  region: us-east-1

Complex

A production deployment with optional inputs:

examples/complex.yaml

# Complex VPC with 3 AZs and a custom CIDR
uses: acdl/pipelines/deploy.yaml@v1.6
module: vpc
environment: dev
inputs:
  cidr: 10.50.0.0/16
  azs: us-east-1a,us-east-1b,us-east-1c
  name: my-production-vpc
  region: us-east-1

Versioning

1.0.0 — interface MAJOR, behavior MINOR, lifecycle PATCH. MAJOR bumps require a new registry entry (immutable publication); old entries enter a 12-month deprecation window.