Terraform script plus modules to set up an S3-based static website, an IAM user for deployments, a CloudFront distribution, an ACM cert, a Route53 zone, and the required Route53 hosts for cert verification and the CF distribution.
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README.md

Terraform setup for S3 static site with CloudFront, Certificate Manager and Route53

This Git repository contains the required Terraform scripts to setup a static website, hosted out of an S3 bucket. The site is fronted by a CloudFront distribution, uses AWS Certificate Manager for HTTPS, and handles creating a DNS zone and configures the required DNS entries in Route53. The files in this repo only support hosting a site on a “naked” or “apex” domain (e.g., on example.com). The repo doesn’t configure the extra bits required to also have the site respond on a sub-domain (e.g., on www.example.com). If you need that, you might want to look at the repo this repo was forked from.

The scripts also take care of:

  • Preventing the origin bucket being indexed by search bots.
  • Access logging
  • Redirecting HTTP to HTTPS

Introduction

This repository is split into 3 parts, each of which can be used as a separate module in your own root script. You can see a working example of such a script in the main.tf file in this repo.

  • r53_zone: configuration of a Route53 zone and ACM cert with DNS-based validations
  • site_main: setup of the site and logging S3 buckets with a CloudFront distribution in front of the site bucket
  • r53_alias: configuration of a Route53 ALIAS record pointing to a CloudFront distribution

Top-level variables

You’ll want to set up a few top level variables (or modify the default values of the ones in variables.tf): domain and region.

Setting up the Route53 zone and ACM certs

Creating a Route53 zone corresponding to your domain, as well as requesting a certificate in ACM and setting up the appropriate DNS records to validate that cert, can be done as follows:

module "r53_zone" {
  source  = "./r53_zone"
  domain  = "${var.domain}"
  comment = "Zone for ${var.domain} // Managed by Terraform"
}

Note: this step requires you to have your DNS properly configured, or the certificate validation will time out. When bootstraping, you can go into the AWS console, extract the provisioned DNS servers, and configure your DNS server entries. If you don’t get this done in time and the certification validation fails, you can just re-run terraform apply.

Inputs

  • domain: The domain you’re going to be hosting the site at.
  • comment (Optional): Comment to associate with the zone

Outputs

  • zone_id: Zone ID of the Route53 zone that was created
  • certificate_arn: ARN of the created certificate from ACM
  • name_servers: List of name servers for the created Route53 zone

Setting up the main site

Creating all the resources for an S3-based static website, including an IAM deployer user, with a CloudFront distribution, using the appropriate SSL certificates is as easy as using the site_main module and passing the appropriate variables:

module "site_main" {
 source                  = "./site_main"
 region                  = "${var.region}"
 domain                  = "${var.domain}"
 site_bucket_name        = "${var.domain}-site"
 logs_bucket_name        = "${var.domain}-logs"
 deployer                = "${var.domain}-deployer"
 acm_certificate_arn     = "${module.r53_zone.certificate_arn}"
 not_found_response_path = "error.html"
}

Inputs

  • region: the AWS region where the S3 bucket will be created. The source bucket can be created in any of the available regions. The default value is us-east-1.
  • domain: the domain name by which you want to make the website available on the Internet. While we are not at the point of setting up the DNS part, the CloudFront distribution needs to know which domain it needs to accept requests for.
  • site_bucket_name: the name of the bucket to create for the S3 based static website. Note that this needs to be globally unique across all AWS S3 buckets!
  • logs_bucket_name: the name of the bucket to create for access logging. Also needs to be globally unique.
  • deployer: the name of an IAM user that will be created to be used to push contents to the S3 bucket. This user will get a role policy attached to it, configured to have read/write access to the bucket that will be created.
  • acm_certificate_arn: the id of an certificate in AWS Certificate Manager. As this certificate will be used on a CloudFront distribution, Amazon’s documentation states the certificate must be generated in the us-east-1 region.
  • default_root_object: (Optional) default root object to be served by CloudFront. Defaults to index.html, but can be e.x. v1.0.0/index.html for versioned applications.
  • not_found_response_path: response path for the file that should be served on 404. Default to /404.html, but can be e.x. /index.html for single page applications.
  • forward_query_string: (Optional) Forward the query string to the origin. Default value = false
  • price_class: (Optional) The price class that corresponds with the maximum price that you want to pay for CloudFront service. Read pricing page for more details. Options: PriceClass_100 | PriceClass_200 | PriceClass_All. Default value = PriceClass_200

Outputs

  • website_cdn_hostname: the Amazon generated Cloudfront domain name. You can already test accessing your website content by this hostname. This hostname is needed later on to create a CNAME record in Route53.
  • website_cdn_zone_id: the Hosted Zone ID of the Cloudfront distribution. This zone ID is needed later on to create a Route53 ALIAS record.
  • site_bucket_id: The website bucket id
  • site_bucket_arn: The website bucket arn
  • website_cdn_id: The CDN ID of the Cloudfront distribution.
  • website_cdn_arn: The ARN of the CDN

Setting up the Route 53 ALIAS

Whether it is a main site or a redirect site, an ALIAS DNS record is needed for your site to be accessed on a root domain.

module "r53_alias" {
  source             = "./r53_alias"
  domain             = "${var.domain}"
  target             = "${module.site_main.website_cdn_hostname}"
  cdn_hosted_zone_id = "${module.site_main.website_cdn_zone_id}"
  route53_zone_id    = "${module.r53_zone.zone_id}"
}

Inputs

  • domain: the domain name you want to use to access your static website. This should match the domain name used in setting up either a main or a redirect site.
  • target: the domain name of the CloudFront distribution to which the domain name should point. You usually pass the website_cdn_hostname output variable from the main or redirect site here.
  • cdn_hosted_zone_id: the Hosted Zone ID of the CloudFront distribution. You usually pass the website_cdn_zone_id output variable from the main or redirect site here.
  • route53_zone_id: the Route53 Zone ID where the CNAME entry must be created.

Credits

This repository is forked from https://github.com/skyscrapers/terraform-website-s3-cloudfront-route53 but has undergone significant revision.

Enjoy!