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.

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Screenshots

VPC Peering Connection in the AWS Web Console

Usage

IMPORTANT: The master branch is used in source just as an example. In your code, 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.

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

THIS FORK USES providers to configure the module vs the upstream that passes in the roles and depends on there being a default aws profile on the system

provider aws {
  alias = "requester"
  //...
}

provider aws {
  alias = "accepter"
  //...
}

module "vpc_peering_cross_account" {
  source           = "git::https://github.com/cloudposse/terraform-aws-vpc-peering-multi-account.git?ref=master"
  namespace        = "eg"
  stage            = "dev"
  name             = "cluster"
  providers = {
    aws.requester = aws.requester
    aws.accepter = aws.accepter
  }

  requester_vpc_id                          = "vpc-xxxxxxxx"
  requester_allow_remote_vpc_dns_resolution = true

  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:

Show 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

Show IAM Policy

{
  "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:

Show 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

Show IAM Policy

{
  "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

Name	Version
terraform	>= 0.12
aws	~> 2.0
null	~> 2.0

Providers

Name	Version
aws.accepter	~> 2.0
aws.requester	~> 2.0

Inputs

Name	Description	Type	Default	Required
accepter_allow_remote_vpc_dns_resolution	Allow accepter VPC to resolve public DNS hostnames to private IP addresses when queried from instances in the requester VPC	`bool`	`true`	no
accepter_subnet_tags	Only add peer routes to accepter VPC route tables of subnets matching these tags	`map(string)`	`{}`	no
accepter_vpc_id	Accepter VPC ID filter	`string`	`""`	no
accepter_vpc_tags	Accepter VPC Tags filter	`map(string)`	`{}`	no
attributes	Additional attributes (e.g. `a` or `b`)	`list(string)`	`[]`	no
auto_accept	Automatically accept the peering	`bool`	`true`	no
delimiter	Delimiter to be used between `namespace`, `stage`, `name`, and `attributes`	`string`	`"-"`	no
enabled	Set to false to prevent the module from creating or accessing any resources	`bool`	`true`	no
name	Name (e.g. `app` or `cluster`)	`string`	n/a	yes
namespace	Namespace (e.g. `eg` or `cp`)	`string`	n/a	yes
requester_allow_remote_vpc_dns_resolution	Allow requester VPC to resolve public DNS hostnames to private IP addresses when queried from instances in the accepter VPC	`bool`	`true`	no
requester_subnet_tags	Only add peer routes to requester VPC route tables of subnets matching these tags	`map(string)`	`{}`	no
requester_vpc_id	Requester VPC ID filter	`string`	`""`	no
requester_vpc_tags	Requester VPC Tags filter	`map(string)`	`{}`	no
skip_metadata_api_check	Don't use the credentials of EC2 instance profile	`bool`	`false`	no
stage	Stage (e.g. `prod`, `dev`, `staging`)	`string`	n/a	yes
tags	Additional tags (e.g. `{"BusinessUnit" = "XYZ"`)	`map(string)`	`{}`	no

Outputs

Name	Description
accepter_accept_status	Accepter VPC peering connection request status
accepter_connection_id	Accepter VPC peering connection ID
requester_accept_status	Requester VPC peering connection request status
requester_connection_id	Requester VPC peering connection ID

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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

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
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KIND, either express or implied.  See the License for the
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Contributors

Andriy Knysh	Erik Osterman

CourtAPI/terraform-aws-vpc-peering-multi-account