terraform-aws-vpc-peering-multi-account

Terraform module to create a peering connection between any two VPCs existing in different AWS accounts.

This module supports performing this action from a 3rd account (e.g. a "root" account) by specifying the roles to assume for each member account.

IMPORTANT: AWS allows a multi-account VPC Peering Connection to be deleted from either the requester's or accepter's side. However, Terraform only allows the VPC Peering Connection to be deleted from the requester's side by removing the corresponding aws_vpc_peering_connection resource from your configuration. Read more about this on Terraform's documentation portal.

This project is part of our comprehensive "SweetOps" approach towards DevOps.

It's 100% Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

Screenshots

VPC Peering Connection in the AWS Web Console

Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.

Benchmark	Description
	Infrastructure Security Compliance
	Center for Internet Security, KUBERNETES Compliance
	Center for Internet Security, AWS Compliance
	Center for Internet Security, AZURE Compliance
	Payment Card Industry Data Security Standards Compliance
	National Institute of Standards and Technology Compliance
	Information Security Management System, ISO/IEC 27001 Compliance
	Service Organization Control 2 Compliance
	Center for Internet Security, GCP Compliance
	Health Insurance Portability and Accountability Compliance

Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

IMPORTANT: Do not pin to master because there may be breaking changes between releases. Instead pin to the release tag (e.g. ?ref=tags/x.y.z) of one of our latest releases.

For a complete example, see examples/complete

module "vpc_peering_cross_account" {
  source = "cloudposse/vpc-peering-multi-account/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  namespace        = "eg"
  stage            = "dev"
  name             = "cluster"

  requester_aws_assume_role_arn             = "arn:aws:iam::XXXXXXXX:role/cross-account-vpc-peering-test"
  requester_region                          = "us-west-2"
  requester_vpc_id                          = "vpc-xxxxxxxx"
  requester_allow_remote_vpc_dns_resolution = true

  accepter_aws_assume_role_arn             = "arn:aws:iam::YYYYYYYY:role/cross-account-vpc-peering-test"
  accepter_region                          = "us-east-1"
  accepter_vpc_id                          = "vpc-yyyyyyyy"
  accepter_allow_remote_vpc_dns_resolution = true
}

The arn:aws:iam::XXXXXXXX:role/cross-account-vpc-peering-test requester IAM Role should have the following Trust Policy:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::XXXXXXXX:root"
      },
      "Action": "sts:AssumeRole",
      "Condition": {}
    }
  ]
}

and the following IAM Policy attached to it:

NOTE: the policy specifies the permissions to create (with terraform plan/apply) and delete (with terraform destroy) all the required resources in the requester AWS account

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "ec2:CreateRoute",
        "ec2:DeleteRoute"
      ],
      "Resource": "arn:aws:ec2:*:XXXXXXXX:route-table/*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "ec2:DescribeVpcPeeringConnections",
        "ec2:DescribeVpcs",
        "ec2:ModifyVpcPeeringConnectionOptions",
        "ec2:DescribeSubnets",
        "ec2:DescribeVpcAttribute",
        "ec2:DescribeRouteTables"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "ec2:AcceptVpcPeeringConnection",
        "ec2:DeleteVpcPeeringConnection",
        "ec2:CreateVpcPeeringConnection",
        "ec2:RejectVpcPeeringConnection"
      ],
      "Resource": [
        "arn:aws:ec2:*:XXXXXXXX:vpc-peering-connection/*",
        "arn:aws:ec2:*:XXXXXXXX:vpc/*"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "ec2:DeleteTags",
        "ec2:CreateTags"
      ],
      "Resource": "arn:aws:ec2:*:XXXXXXXX:vpc-peering-connection/*"
    }
  ]
}

where XXXXXXXX is the requester AWS account ID.

The arn:aws:iam::YYYYYYYY:role/cross-account-vpc-peering-test accepter IAM Role should have the following Trust Policy:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::XXXXXXXX:root"
      },
      "Action": "sts:AssumeRole",
      "Condition": {}
    }
  ]
}

NOTE: The accepter Trust Policy is the same as the requester Trust Policy since it defines who can assume the IAM Role. In the requester case, the requester account ID itself is the trusted entity. For the accepter, the Trust Policy specifies that the requester account ID XXXXXXXX can assume the role in the accepter AWS account YYYYYYYY.

and the following IAM Policy attached to it:

NOTE: the policy specifies the permissions to create (with terraform plan/apply) and delete (with terraform destroy) all the required resources in the accepter AWS account

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "ec2:CreateRoute",
        "ec2:DeleteRoute"
      ],
      "Resource": "arn:aws:ec2:*:YYYYYYYY:route-table/*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "ec2:DescribeVpcPeeringConnections",
        "ec2:DescribeVpcs",
        "ec2:ModifyVpcPeeringConnectionOptions",
        "ec2:DescribeSubnets",
        "ec2:DescribeVpcAttribute",
        "ec2:DescribeRouteTables"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "ec2:AcceptVpcPeeringConnection",
        "ec2:DeleteVpcPeeringConnection",
        "ec2:CreateVpcPeeringConnection",
        "ec2:RejectVpcPeeringConnection"
      ],
      "Resource": [
        "arn:aws:ec2:*:YYYYYYYY:vpc-peering-connection/*",
        "arn:aws:ec2:*:YYYYYYYY:vpc/*"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "ec2:DeleteTags",
        "ec2:CreateTags"
      ],
      "Resource": "arn:aws:ec2:*:YYYYYYYY:vpc-peering-connection/*"
    }
  ]
}

where YYYYYYYY is the accepter AWS account ID.

For more information on IAM policies and permissions for VPC peering, see Creating and managing VPC peering connections.

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Providers

Modules

Resources

Inputs

{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_key_case": null,
  "label_order": [],
  "label_value_case": null,
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {}
}

Outputs

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Related Projects

Check out these related projects.

• terraform-aws-vpc - Terraform Module that defines a VPC with public/private subnets across multiple AZs with Internet Gateways
• terraform-aws-vpc-peering - Terraform module to create a peering connection between two VPCs in the same AWS account
• terraform-aws-kops-vpc-peering - Terraform module to create a peering connection between a backing services VPC and a VPC created by Kops

References

For additional context, refer to some of these links.

• What is VPC Peering? - VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IPv4 addresses or IPv6 addresses.

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Copyright

Copyright © 2017-2021 Cloud Posse, LLC

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.

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Contributors

Andriy Knysh	Erik Osterman