This Terraform Module creates VPC Peering
Connections between VPCs. Normally, VPCs are
completely isolated from each other, but sometimes, you want to allow traffic to flow between them, such as allowing
DevOps tools running in a Mgmt VPC (see vpc-mgmt) to talk to apps running in a Stage or Prod VPC (see
vpc-app). This module can create peering connections and route table entries that make this sort of
cross-VPC communication possible.
A VPC or Virtual Private Cloud is a logically isolated section of your AWS cloud. Each
VPC defines a virtual network within which you run your AWS resources, as well as rules for what can go in and out of
that network. This includes subnets, route tables that tell those subnets how to route inbound and outbound traffic,
security groups, access controls lists for the network (NACLs), and any other network components such as VPN connections.
Why bother with peering and not just put everything in one VPC?
We intentionally keep VPCs as isolated as we can to reduce the chances that a problem in one VPC will affect the other
VPCs. For example, our standard VPC deployment gives you an isolated staging VPC where you can test changes without
having to worry that they might affect production. Similarly, if an attacker breaks into the staging VPC, they cannot
easily access your production data without breaking through yet another layer of security. These multiple layers are
known as "defense-in-depth."
The point of VPC peering is to allow limited, controlled cross-VPC communication. In particular, you may want to set
up peering to allow a user logged into a management VPC to carry out maintenance tasks in the staging and production
VPCs. However, VPC peering relationships are not "transitive": even though the management VPC can access both staging
and production, someone in staging cannot access production.
Questions? Ask away.
We're here to talk about our services, answer any questions, give advice, or just to chat.
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class=\"preview__body--title\" id=\"vpc-peering-terraform-module\">VPC-Peering Terraform Module</h1><div class=\"preview__body--border\"></div><p>This Terraform Module creates <a href=\"http://docs.aws.amazon.com/AmazonVPC/latest/PeeringGuide/Welcome.html\" class=\"preview__body--description--blue\" target=\"_blank\">VPC Peering\nConnections</a> between VPCs. Normally, VPCs are\ncompletely isolated from each other, but sometimes, you want to allow traffic to flow between them, such as allowing\nDevOps tools running in a Mgmt VPC (see <a href=\"/repos/v0.18.6/terraform-aws-vpc/modules/vpc-mgmt\" class=\"preview__body--description--blue\">vpc-mgmt</a>) to talk to apps running in a Stage or Prod VPC (see\n<a href=\"/repos/v0.18.6/terraform-aws-vpc/modules/vpc-app\" class=\"preview__body--description--blue\">vpc-app</a>). This module can create peering connections and route table entries that make this sort of\ncross-VPC communication possible.</p>\n<h2 class=\"preview__body--subtitle\" id=\"how-do-you-use-this-module\">How do you use this module?</h2>\n<p>Check out the <a href=\"/repos/v0.18.6/terraform-aws-vpc/examples\" class=\"preview__body--description--blue\">examples folder</a>.</p>\n<h2 class=\"preview__body--subtitle\" id=\"whats-a-vpc\">What's a VPC?</h2>\n<p>A <a href=\"https://aws.amazon.com/vpc/\" class=\"preview__body--description--blue\" target=\"_blank\">VPC</a> or Virtual Private Cloud is a logically isolated section of your AWS cloud. Each\nVPC defines a virtual network within which you run your AWS resources, as well as rules for what can go in and out of\nthat network. This includes subnets, route tables that tell those subnets how to route inbound and outbound traffic,\nsecurity groups, access controls lists for the network (NACLs), and any other network components such as VPN connections.</p>\n<h2 class=\"preview__body--subtitle\" id=\"why-bother-with-peering-and-not-just-put-everything-in-one-vpc\">Why bother with peering and not just put everything in one VPC?</h2>\n<p>We intentionally keep VPCs as isolated as we can to reduce the chances that a problem in one VPC will affect the other\nVPCs. For example, our standard VPC deployment gives you an isolated staging VPC where you can test changes without\nhaving to worry that they might affect production. Similarly, if an attacker breaks into the staging VPC, they cannot\neasily access your production data without breaking through yet another layer of security. These multiple layers are\nknown as "defense-in-depth."</p>\n<p>The point of VPC peering is to allow limited, controlled cross-VPC communication. In particular, you may want to set\nup peering to allow a user logged into a management VPC to carry out maintenance tasks in the staging and production\nVPCs. However, VPC peering relationships are not "transitive": even though the management VPC can access both staging\nand production, someone in staging <em>cannot</em> access production.</p>\n","repoName":"terraform-aws-vpc","repoRef":"v0.18.0","serviceDescriptor":{"serviceName":"Virtual Private Cloud (VPC)","serviceRepoName":"terraform-aws-vpc","serviceRepoOrg":"gruntwork-io","cloudProviders":["aws"],"description":"Create a Virtual Private Cloud (VPC). Includes multiple subnet tiers, NACLs, NAT gateways, Internet Gateways, and VPC peering.","imageUrl":"vpc.png","licenseType":"subscriber","technologies":["Terraform"],"compliance":[],"tags":[""]},"serviceCategoryName":"Networking","fileName":"README.md","filePath":"/modules/vpc-peering","title":"Repo Browser: Virtual Private Cloud (VPC)","description":"Browse the repos in the Gruntwork Infrastructure as Code Library."}
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main.tf
