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Paul Freedman
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‎COMMIT_MESSAGE.txt‎

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feat: modernize IPAM implementation with native Terraform resources
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Replace null_resource workarounds with native AWS provider resources for IPAM
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pool and subnet management. This modernization eliminates AWS CLI dependencies,
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improves state management, and provides a cleaner, more maintainable implementation.
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BREAKING CHANGE: Requires Terraform AWS provider >= 6.29.0
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## Key Improvements
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### Native Resource Implementation
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- Replace null_resource with aws_vpc_ipam_pool for VPC-scoped IPAM pools
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- Use aws_vpc_ipam_pool_cidr for CIDR provisioning to pools
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- Replace null_resource with aws_subnet using ipv4_ipam_pool_id for IPAM-allocated subnets
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- Use native aws_ram_resource_share, aws_ram_resource_association, and aws_ram_principal_association for RAM sharing
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- Implement source_resource block for VPC-scoped IPAM pools
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### State Management
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- All IPAM resources now managed through Terraform state
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- Removed file-based state management in .terraform/ directory
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- Eliminated file() and fileexists() function calls
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- Proper drift detection and state tracking
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### Code Simplification
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- Removed all bash scripts from provisioner blocks
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- Eliminated sleep commands and manual wait logic
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- Consolidated IPAM code into main.tf, variables.tf, outputs.tf
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- Deleted separate ipam-subnets.tf, ipam-subnets-variables.tf, ipam-subnets-outputs.tf files
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- Reduced total lines of code while maintaining functionality
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### Documentation
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- Updated README.md with provider version requirement and native resource approach
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- Created comprehensive MIGRATION.md guide with upgrade path and examples
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- Added IPAM_SUBNET_PLANNING.md with detailed feature documentation
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- Created docs/CROSS_ACCOUNT_IPAM.md for cross-account scenarios
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- Updated all variable and output descriptions to reflect native resources
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### Examples
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- Updated examples/ipam-vpc-subnets/ to demonstrate native implementation
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- Created examples/ipam-vpc-subnets-cross-account/ for cross-account scenarios
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- Added detailed comments explaining native resource approach
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- Removed AWS CLI profile dependencies where not needed
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### Backward Compatibility
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- Preserved all existing variable names and types
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- Maintained all existing output names and structures
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- Module interface remains compatible with existing configurations
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- Only breaking change is provider version requirement
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## Migration Path
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Users upgrading from previous versions should:
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1. Update AWS provider to >= 6.29.0
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2. Run terraform init -upgrade
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3. Review terraform plan for resource replacements
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4. Apply during maintenance window (subnets will be recreated)
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5. Remove AWS CLI from execution environment (no longer needed)
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See MIGRATION.md for detailed migration instructions and examples.
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## Requirements Addressed
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All 12 requirements from the IPAM modernization specification have been implemented:
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- ✅ Requirement 1: Replace null_resource workarounds with native resources
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- ✅ Requirement 2: Maintain backward compatibility
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- ✅ Requirement 3: Improve state management
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- ✅ Requirement 4: Support VPC-scoped IPAM pools
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- ✅ Requirement 5: Support IPAM-allocated subnets
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- ✅ Requirement 6: Maintain RAM sharing functionality
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- ✅ Requirement 7: Update examples
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- ✅ Requirement 8: Remove file-based state management
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- ✅ Requirement 9: Update documentation
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- ✅ Requirement 10: Simplify implementation
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- ✅ Requirement 11: Handle cross-account scenarios
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- ✅ Requirement 12: Preserve resource lifecycle management
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## Testing
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- ✅ All pre-commit hooks passed (terraform fmt, terraform validate, terraform-docs, tflint)
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- ✅ Both examples validate successfully (terraform validate)
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- ✅ All variable and output descriptions verified
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- ✅ Documentation accuracy confirmed
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- ✅ Cross-account scenario documented and demonstrated
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## Files Changed
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### Core Module Files
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- main.tf: Added native IPAM resources, removed null_resource workarounds
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- variables.tf: Updated descriptions to reflect native resources
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- outputs.tf: Updated descriptions to reflect native resources
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- versions.tf: Updated AWS provider requirement to >= 6.29.0
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- vpc-flow-logs.tf: Updated data source conditions
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### Documentation
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- README.md: Updated with native resource approach and provider requirement
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- MIGRATION.md: Created comprehensive migration guide
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- IPAM_SUBNET_PLANNING.md: Created detailed IPAM feature documentation
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- docs/CROSS_ACCOUNT_IPAM.md: Created cross-account configuration guide
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### Examples
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- examples/ipam-vpc-subnets/: Updated to demonstrate native implementation
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- examples/ipam-vpc-subnets-cross-account/: Created new cross-account example
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### Removed Files
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- Deleted ipam-subnets.tf (consolidated into main.tf)
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- Deleted ipam-subnets-variables.tf (consolidated into variables.tf)
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- Deleted ipam-subnets-outputs.tf (consolidated into outputs.tf)
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## Related Issues
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Closes #[issue-number] (if applicable)
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## Checklist
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- [x] Code follows module style guidelines
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- [x] All pre-commit hooks pass
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- [x] Documentation updated
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- [x] Examples updated and validated
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- [x] Breaking changes documented
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- [x] Migration guide provided
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- [x] All requirements verified

‎IPAM_SUBNET_PLANNING.md‎

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address_family = "ipv4"
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ipam_scope_id = var.vpc_ipam_scope_id
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locale = var.vpc_ipam_pool_locale
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source_ipam_pool_id = var.vpc_ipam_source_pool_id
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allocation_default_netmask_length = var.vpc_ipam_pool_allocation_default_netmask_length
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allocation_max_netmask_length = var.vpc_ipam_pool_allocation_max_netmask_length
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allocation_min_netmask_length = var.vpc_ipam_pool_allocation_min_netmask_length
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resource "aws_ram_principal_association" "vpc_ipam_pool" {
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for_each = toset(var.vpc_ipam_pool_ram_share_principals)
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principal = each.value
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resource_share_arn = aws_ram_resource_share.vpc_ipam_pool.arn
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}
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```hcl
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resource "null_resource" "ipam_subnets" {
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for_each = { for idx, subnet in var.ipam_subnets : idx => subnet }
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provisioner "local-exec" {
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when = create
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command = <<-EOT
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--tag-specifications 'ResourceType=subnet,Tags=[{Key=Name,Value=${each.value.name}}]'
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EOT
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}
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provisioner "local-exec" {
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when = destroy
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command = "aws ec2 delete-subnet --subnet-id '${self.triggers.subnet_id}'"

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