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

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:

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	>= 0.13.0
aws	>= 2.0
null	>= 2.0

Providers

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

Modules

Name	Source	Version
accepter	cloudposse/label/null	0.24.1
requester	cloudposse/label/null	0.24.1
this	cloudposse/label/null	0.24.1

Resources

Name
aws_caller_identity
aws_region
aws_route
aws_route_table
aws_route_tables
aws_subnet_ids
aws_vpc
aws_vpc_peering_connection
aws_vpc_peering_connection_accepter
aws_vpc_peering_connection_options

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_aws_access_key	Access key id to use in accepter account	`string`	`""`	no
accepter_aws_assume_role_arn	Accepter AWS Assume Role ARN	`string`	n/a	yes
accepter_aws_profile	Profile used to assume accepter_aws_assume_role_arn	`string`	`""`	no
accepter_aws_secret_key	Secret access key to use in accepter account	`string`	`""`	no
accepter_aws_token	Session token for validating temporary credentials	`string`	`""`	no
accepter_region	Accepter AWS region	`string`	n/a	yes
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
additional_tag_map	Additional tags for appending to tags_as_list_of_maps. Not added to `tags`.	`map(string)`	`{}`	no
attributes	Additional attributes (e.g. `1`)	`list(string)`	`[]`	no
auto_accept	Automatically accept the peering	`bool`	`true`	no
context	Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as `null` to use default value. Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional_tag_map, which are merged.	`any`	{ "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": {} }	no
delimiter	Delimiter to be used between `namespace`, `environment`, `stage`, `name` and `attributes`. Defaults to `-` (hyphen). Set to `""` to use no delimiter at all.	`string`	`null`	no
enabled	Set to false to prevent the module from creating any resources	`bool`	`null`	no
environment	Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT'	`string`	`null`	no
id_length_limit	Limit `id` to this many characters (minimum 6). Set to `0` for unlimited length. Set to `null` for default, which is `0`. Does not affect `id_full`.	`number`	`null`	no
label_key_case	The letter case of label keys (`tag` names) (i.e. `name`, `namespace`, `environment`, `stage`, `attributes`) to use in `tags`. Possible values: `lower`, `title`, `upper`. Default value: `title`.	`string`	`null`	no
label_order	The naming order of the id output and Name tag. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 5 elements, but at least one must be present.	`list(string)`	`null`	no
label_value_case	The letter case of output label values (also used in `tags` and `id`). Possible values: `lower`, `title`, `upper` and `none` (no transformation). Default value: `lower`.	`string`	`null`	no
name	Solution name, e.g. 'app' or 'jenkins'	`string`	`null`	no
namespace	Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp'	`string`	`null`	no
regex_replace_chars	Regex to replace chars with empty string in `namespace`, `environment`, `stage` and `name`. If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits.	`string`	`null`	no
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_aws_access_key	Access key id to use in requester account	`string`	`""`	no
requester_aws_assume_role_arn	Requester AWS Assume Role ARN	`string`	n/a	yes
requester_aws_profile	Profile used to assume requester_aws_assume_role_arn	`string`	`""`	no
requester_aws_secret_key	Secret access key to use in requester account	`string`	`""`	no
requester_aws_token	Session token for validating temporary credentials	`string`	`""`	no
requester_region	Requester AWS region	`string`	n/a	yes
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', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release'	`string`	`null`	no
tags	Additional tags (e.g. `map('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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NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

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
"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.

Trademarks

All other trademarks referenced herein are the property of their respective owners.

About

This project is maintained and funded by Cloud Posse, LLC. Like it? Please let us know by leaving a testimonial!

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Contributors

Andriy Knysh	Erik Osterman

Name		Name	Last commit message	Last commit date
Latest commit History 27 Commits
.github		.github
docs		docs
examples		examples
images		images
test		test
.gitignore		.gitignore
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
README.yaml		README.yaml
accepter.tf		accepter.tf
context.tf		context.tf
main.tf		main.tf
requester.tf		requester.tf
variables.tf		variables.tf
versions.tf		versions.tf

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