Terraform Module that implements a CloudFront Distribution (CDN) for a custom origin (e.g. website) and ships logs to a bucket.

If you need to accelerate an S3 bucket, we suggest using terraform-aws-cloudfront-s3-cdn instead.

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Usage

For a complete example, see examples/complete.

For automated tests of the complete example using bats and Terratest (which tests and deploys the example on AWS), see test.

module "cdn" {
  source = "cloudposse/cloudfront-cdn/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace          = "eg"
  stage              = "prod"
  name               = "app"
  aliases            = ["www.example.net"]
  origin_domain_name = "origin.example.com"
  parent_zone_name   = "example.net"
}

Complete example of setting up CloudFront Distribution with Cache Behaviors for a WordPress site: examples/wordpress

Generating ACM Certificate

Use the AWS cli to request new ACM certifiates (requires email validation)

aws acm request-certificate --domain-name example.com --subject-alternative-names a.example.com b.example.com *.c.example.com

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

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	>= 1.0
aws	>= 4.9.0
local	>= 1.2

Providers

Name	Version
aws	>= 4.9.0

Modules

Name	Source	Version
dns	cloudposse/route53-alias/aws	0.13.0
logs	cloudposse/s3-log-storage/aws	1.4.2
origin_label	cloudposse/label/null	0.25.0
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_cloudfront_distribution.default	resource
aws_cloudfront_origin_access_identity.default	resource

Inputs

Name	Description	Type	Default	Required
acm_certificate_arn	Existing ACM Certificate ARN	string	""	no
additional_tag_map	Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id. This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration.	map(string)	{}	no
aliases	List of aliases. CAUTION! Names MUSTN'T contain trailing .	list(string)	[]	no
allowed_methods	List of allowed methods (e.g. GET, PUT, POST, DELETE, HEAD) for AWS CloudFront	list(string)	[ "DELETE", "GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT" ]	no
attributes	ID element. Additional attributes (e.g. workers or cluster) to add to id, in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the delimiter and treated as a single ID element.	list(string)	[]	no
cache_policy_id	ID of the cache policy attached to the cache behavior	string	null	no
cached_methods	List of cached methods (e.g. GET, PUT, POST, DELETE, HEAD)	list(string)	[ "GET", "HEAD" ]	no
comment	Comment for the origin access identity	string	"Managed by Terraform"	no
compress	Whether you want CloudFront to automatically compress content for web requests that include Accept-Encoding: gzip in the request header (default: false)	bool	false	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, "descriptor_formats": {}, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "labels_as_tags": [ "unset" ], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {}, "tenant": null }	no
custom_error_response	List of one or more custom error response element maps	list(object({ error_caching_min_ttl = string error_code = string response_code = string response_page_path = string }))	[]	no
custom_header	List of one or more custom headers passed to the origin	list(object({ name = string value = string }))	[]	no
custom_origins	One or more custom origins for this distribution (multiples allowed). See documentation for configuration options description https://www.terraform.io/docs/providers/aws/r/cloudfront_distribution.html#origin-arguments	list(object({ domain_name = string origin_id = string origin_path = string custom_headers = list(object({ name = string value = string })) custom_origin_config = object({ http_port = number https_port = number origin_protocol_policy = string origin_ssl_protocols = list(string) origin_keepalive_timeout = number origin_read_timeout = number }) s3_origin_config = object({ origin_access_identity = string }) }))	[]	no
default_root_object	Object that CloudFront return when requests the root URL	string	"index.html"	no
default_ttl	Default amount of time (in seconds) that an object is in a CloudFront cache	number	60	no
delimiter	Delimiter to be used between ID elements. Defaults to - (hyphen). Set to "" to use no delimiter at all.	string	null	no
descriptor_formats	Describe additional descriptors to be output in the descriptors output map. Map of maps. Keys are names of descriptors. Values are maps of the form {<br> format = string<br> labels = list(string)<br>} (Type is any so the map values can later be enhanced to provide additional options.) format is a Terraform format string to be passed to the format() function. labels is a list of labels, in order, to pass to format() function. Label values will be normalized before being passed to format() so they will be identical to how they appear in id. Default is {} (descriptors output will be empty).	any	{}	no
distribution_enabled	Set to true if you want CloudFront to begin processing requests as soon as the distribution is created, or to false if you do not want CloudFront to begin processing requests after the distribution is created.	bool	true	no
dns_aliases_enabled	Set to false to prevent dns records for aliases from being created	bool	true	no
enabled	Set to false to prevent the module from creating any resources	bool	null	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	string	null	no
forward_cookies	Specifies whether you want CloudFront to forward cookies to the origin. Valid options are all, none or whitelist	string	"none"	no
forward_cookies_whitelisted_names	List of forwarded cookie names	list(string)	[]	no
forward_headers	Specifies the Headers, if any, that you want CloudFront to vary upon for this cache behavior. Specify * to include all headers.	list(string)	[]	no
forward_query_string	Forward query strings to the origin that is associated with this cache behavior	bool	false	no
function_association	A config block that triggers a CloudFront function with specific actions. See the aws_cloudfront_distribution documentation for more information.	list(object({ event_type = string function_arn = string }))	[]	no
geo_restriction_locations	List of country codes for which CloudFront either to distribute content (whitelist) or not distribute your content (blacklist)	list(string)	[]	no
geo_restriction_type	Method that use to restrict distribution of your content by country: none, whitelist, or blacklist	string	"none"	no
http_version	The maximum HTTP version to support on the distribution. Allowed values are http1.1, http2, http2and3 and http3.	string	"http2"	no
id_length_limit	Limit id to this many characters (minimum 6). Set to 0 for unlimited length. Set to null for keep the existing setting, which defaults to 0. Does not affect id_full.	number	null	no
is_ipv6_enabled	State of CloudFront IPv6	bool	true	no
label_key_case	Controls the letter case of the tags keys (label names) for tags generated by this module. Does not affect keys of tags passed in via the tags input. Possible values: lower, title, upper. Default value: title.	string	null	no
label_order	The order in which the labels (ID elements) appear in the id. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.	list(string)	null	no
label_value_case	Controls the letter case of ID elements (labels) as included in id, set as tag values, and output by this module individually. Does not affect values of tags passed in via the tags input. Possible values: lower, title, upper and none (no transformation). Set this to title and set delimiter to "" to yield Pascal Case IDs. Default value: lower.	string	null	no
labels_as_tags	Set of labels (ID elements) to include as tags in the tags output. Default is to include all labels. Tags with empty values will not be included in the tags output. Set to [] to suppress all generated tags. Notes: The value of the name tag, if included, will be the id, not the name. Unlike other null-label inputs, the initial setting of labels_as_tags cannot be changed in later chained modules. Attempts to change it will be silently ignored.	set(string)	[ "default" ]	no
lambda_function_association	A config block that triggers a Lambda@Edge function with specific actions	list(object({ event_type = string include_body = bool lambda_arn = string }))	[]	no
log_bucket_fqdn	Optional fqdn of logging bucket, if not supplied a bucket will be generated.	string	""	no
log_expiration_days	Number of days after which to expunge the objects	number	90	no
log_force_destroy	Applies to log bucket created by this module only. If true, all objects will be deleted from the bucket on destroy, so that the bucket can be destroyed without error. These objects are not recoverable.	bool	false	no
log_glacier_transition_days	Number of days after which to move the data to the glacier storage tier	number	60	no
log_include_cookies	Include cookies in access logs	bool	false	no
log_prefix	Path of logs in S3 bucket	string	""	no
log_standard_transition_days	Number of days to persist in the standard storage tier before moving to the glacier tier	number	30	no
logging_enabled	When true, access logs will be sent to a newly created s3 bucket	bool	true	no
max_ttl	Maximum amount of time (in seconds) that an object is in a CloudFront cache	number	31536000	no
min_ttl	Minimum amount of time that you want objects to stay in CloudFront caches	number	0	no
name	ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'. This is the only ID element not also included as a tag. The "name" tag is set to the full id string. There is no tag with the value of the name input.	string	null	no
namespace	ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique	string	null	no
ordered_cache	An ordered list of cache behaviors resource for this distribution. List from top to bottom in order of precedence. The topmost cache behavior will have precedence 0. The fields can be described by the other variables in this file. For example, the field 'lambda_function_association' in this object has a description in var.lambda_function_association variable earlier in this file. The only difference is that fields on this object are in ordered caches, whereas the rest of the vars in this file apply only to the default cache. Put value "" on field target_origin_id to specify default s3 bucket origin.	list(object({ target_origin_id = string path_pattern = string allowed_methods = list(string) cached_methods = list(string) cache_policy_id = string origin_request_policy_id = string compress = bool viewer_protocol_policy = string min_ttl = number default_ttl = number max_ttl = number forward_query_string = bool forward_header_values = list(string) forward_cookies = string response_headers_policy_id = string lambda_function_association = list(object({ event_type = string include_body = bool lambda_arn = string })) function_association = list(object({ event_type = string function_arn = string })) }))	[]	no
origin_access_identity_enabled	When true, creates origin access identity resource	bool	true	no
origin_domain_name	The DNS domain name of your custom origin (e.g. website)	string	""	no
origin_http_port	The HTTP port the custom origin listens on	number	"80"	no
origin_https_port	The HTTPS port the custom origin listens on	number	443	no
origin_keepalive_timeout	The Custom KeepAlive timeout, in seconds. By default, AWS enforces a limit of 60. But you can request an increase.	number	60	no
origin_path	An optional element that causes CloudFront to request your content from a directory in your Amazon S3 bucket or your custom origin. It must begin with a /. Do not add a / at the end of the path.	string	""	no
origin_protocol_policy	The origin protocol policy to apply to your origin. One of http-only, https-only, or match-viewer	string	"match-viewer"	no
origin_read_timeout	The Custom Read timeout, in seconds. By default, AWS enforces a limit of 60. But you can request an increase.	number	60	no
origin_request_policy_id	ID of the origin request policy attached to the cache behavior	string	null	no
origin_shield	The CloudFront Origin Shield settings	object({ enabled = bool region = string })	null	no
origin_ssl_protocols	The SSL/TLS protocols that you want CloudFront to use when communicating with your origin over HTTPS	list(string)	[ "TLSv1", "TLSv1.1", "TLSv1.2" ]	no
parent_zone_id	ID of the hosted zone to contain this record (or specify parent_zone_name)	string	""	no
parent_zone_name	Name of the hosted zone to contain this record (or specify parent_zone_id)	string	""	no
price_class	Price class for this distribution: PriceClass_All, PriceClass_200, PriceClass_100	string	"PriceClass_100"	no
realtime_log_config_arn	The ARN of the real-time log configuration that is attached to this cache behavior	string	null	no
regex_replace_chars	Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.	string	null	no
response_headers_policy_id	The identifier for a response headers policy	string	""	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	string	null	no
tags	Additional tags (e.g. {'BusinessUnit': 'XYZ'}). Neither the tag keys nor the tag values will be modified by this module.	map(string)	{}	no
tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	string	null	no
trusted_signers	List of AWS account IDs (or self) that you want to allow to create signed URLs for private content	list(string)	[]	no
viewer_minimum_protocol_version	The minimum version of the SSL protocol that you want CloudFront to use for HTTPS connections. This is ignored if the default CloudFront certificate is used.	string	"TLSv1.2_2021"	no
viewer_protocol_policy	allow-all, redirect-to-https	string	"redirect-to-https"	no
web_acl_id	ID of the AWS WAF web ACL that is associated with the distribution	string	""	no

Outputs

Name	Description
cf_aliases	Extra CNAMEs of AWS CloudFront
cf_arn	ARN of CloudFront distribution
cf_domain_name	Domain name corresponding to the distribution
cf_etag	Current version of the distribution's information
cf_hosted_zone_id	CloudFront Route 53 Zone ID
cf_id	ID of CloudFront distribution
cf_origin_access_identity	A shortcut to the full path for the origin access identity to use in CloudFront
cf_status	Current status of the distribution
logs	Logs resource

Related Projects

Check out these related projects.

• terraform-aws-cloudfront-s3-cdn - Terraform module to easily provision CloudFront CDN backed by an S3 origin
• terraform-aws-s3-log-storage - This module creates an S3 bucket suitable for receiving logs from other AWS services such as S3, CloudFront, and CloudTrail
• terraform-aws-cloudtrail - Terraform module to provision an AWS CloudTrail and an encrypted S3 bucket with versioning to store CloudTrail logs
• terraform-aws-s3-website - Terraform module to provision S3-backed websites
• terraform-root-modules/aws/docs - Reference implementation combining terraform-aws-s3-website with terraform-aws-cdn

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Complete license is available in the LICENSE file.

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