with-routes-dns

VPC Peering with Routes and DNS Example

This example demonstrates a complete VPC peering setup with automatic route management and DNS resolution using the connections map pattern.

What This Example Creates

• VPC peering connection with:
  • Automatic route creation
  • DNS resolution enabled
  • Route table management

Configuration

Configure the peering connection using the connections map:

connections = {
  "app-to-data" = {
    requester_vpc_id                = var.requester_vpc_id
    accepter_vpc_id                 = var.accepter_vpc_id
    requester_route_table_ids       = var.requester_route_table_ids
    accepter_route_table_ids        = var.accepter_route_table_ids
    requester_destination_cidrs     = var.requester_destination_cidrs
    accepter_destination_cidrs      = var.accepter_destination_cidrs
    allow_remote_vpc_dns_resolution = true
  }
}

Features Demonstrated

• Route Management: Automatically creates routes in specified route tables
• DNS Resolution: Enables DNS resolution across peered VPCs
• Complete Connectivity: Full bidirectional communication setup

Usage

terraform init
terraform plan
terraform apply

Configuration Details

The module automatically:

1. Creates peering connection between VPCs
2. Adds routes to specified route tables
3. Enables DNS resolution for both VPCs
4. Configures bidirectional connectivity

Route Configuration

• Routes are created in the specified route tables
• Routes point to the peering connection
• Supports multiple destination CIDRs per VPC

DNS Resolution

• Instances in requester VPC can resolve DNS names in accepter VPC
• Instances in accepter VPC can resolve DNS names in requester VPC

Outputs

After successful deployment:

peering_connection_ids = {
  "app-to-data" = "pcx-1234567890abcdef0"
}

peering_connection_status = {
  "app-to-data" = "active"
}

Clean Up

terraform destroy

Requirements

Name	Version
terraform	>= 1.5
aws	>= 5.0

Providers

No providers.

Modules

Name	Source	Version
tags	sourcefuse/arc-tags/aws	1.2.6
vpc_peering	../../	n/a

Resources

No resources.

Inputs

Name	Description	Type	Default	Required
accepter_destination_cidrs	List of CIDR blocks to route from accepter VPC (usually requester VPC CIDRs)	list(string)	n/a	yes
accepter_route_table_ids	List of route table IDs in the accepter VPC	list(string)	n/a	yes
accepter_vpc_id	ID of the accepter VPC	string	n/a	yes
aws_region	AWS region	string	"us-east-1"	no
requester_destination_cidrs	List of CIDR blocks to route from requester VPC (usually accepter VPC CIDRs)	list(string)	n/a	yes
requester_route_table_ids	List of route table IDs in the requester VPC	list(string)	n/a	yes
requester_vpc_id	ID of the requester VPC	string	n/a	yes

Outputs

Name	Description
peering_connection_id	The ID of the VPC peering connection
peering_status	The status of the VPC peering connection