terraform-aws-datadog-lambda-forwarder

Terraform module to provision all the necessary infrastructure to deploy Datadog Lambda forwarders

This project is part of our comprehensive "SweetOps" approach towards DevOps.

It's 100% Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

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.

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.

To enable Datadog forwarder for RDS Enhanced monitoring:

module "datadog_lambda_forwarder" {
  source = "cloudposse/datadog-lambda-forwarder/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  forwarder_rds_enabled = true
}

To enable Datadog forwarder for a CloudTrail S3 bucket:

module "datadog_lambda_forwarder" {
  source = "cloudposse/datadog-lambda-forwarder/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  forwarder_log_enabled = true
  s3_buckets            = ["cloudtrail-audit-bucket"]
  s3_bucket_kms_arns    = ["arn:aws:kms:us-west-2:1234567890:key/b204f3d2-1111-2222-94333332-4444ccc222"]
}

To enable Datadog forwarder for RDS authentication CloudWatch logs:

module "datadog_lambda_forwarder" {
  source = "cloudposse/datadog-lambda-forwarder/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  forwarder_log_enabled = true
  cloudwatch_forwarder_log_groups = {
    postgres = {
      name           = "/aws/rds/cluster/pg-main/postgresql"
      filter_pattern = ""
    }
  }
}

To enable Datadog forwarder for VPC Flow Logs CloudWatch logs:

module "datadog_lambda_forwarder" {
  source = "cloudposse/datadog-lambda-forwarder/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  forwarder_vpc_logs_enabled   = true
  vpclogs_cloudwatch_log_group = "/aws/vpc/flowlogs/vpc1"
}

To use a local copy of the lambda code you can specify the artifact url:

module "datadog_lambda_forwarder" {
  source = "cloudposse/datadog-lambda-forwarder/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  forwarder_rds_enabled      = true
  forwarder_rds_artifact_url = file("${path.module}/function.zip")
}

Examples

Here is an example of using this module:

examples/complete - complete example of using this module

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
archive	>= 2.2.0
aws	>= 3.0

Providers

Name	Version
archive	>= 2.2.0
aws	>= 3.0

Modules

Name	Source	Version
forwarder_log_artifact	cloudposse/module-artifact/external	0.7.1
forwarder_log_label	cloudposse/label/null	0.25.0
forwarder_log_s3_label	cloudposse/label/null	0.25.0
forwarder_rds_artifact	cloudposse/module-artifact/external	0.7.1
forwarder_rds_label	cloudposse/label/null	0.25.0
forwarder_vpclogs_artifact	cloudposse/module-artifact/external	0.7.1
forwarder_vpclogs_label	cloudposse/label/null	0.25.0
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_cloudwatch_log_group.forwarder_log	resource
aws_cloudwatch_log_group.forwarder_rds	resource
aws_cloudwatch_log_group.forwarder_vpclogs	resource
aws_cloudwatch_log_subscription_filter.cloudwatch_log_subscription_filter	resource
aws_cloudwatch_log_subscription_filter.datadog_log_subscription_filter_rds	resource
aws_cloudwatch_log_subscription_filter.datadog_log_subscription_filter_vpclogs	resource
aws_iam_policy.lambda_forwarder_log	resource
aws_iam_policy.lambda_forwarder_log_s3	resource
aws_iam_policy.lambda_forwarder_rds	resource
aws_iam_policy.lambda_forwarder_vpclogs	resource
aws_iam_role.lambda_forwarder_log	resource
aws_iam_role.lambda_forwarder_rds	resource
aws_iam_role.lambda_forwarder_vpclogs	resource
aws_iam_role_policy_attachment.datadog_s3	resource
aws_iam_role_policy_attachment.lambda_forwarder_log	resource
aws_iam_role_policy_attachment.lambda_forwarder_rds	resource
aws_iam_role_policy_attachment.lambda_forwarder_vpclogs	resource
aws_lambda_function.forwarder_log	resource
aws_lambda_function.forwarder_rds	resource
aws_lambda_function.forwarder_vpclogs	resource
aws_lambda_permission.allow_s3_bucket	resource
aws_lambda_permission.cloudwatch_enhanced_rds_monitoring	resource
aws_lambda_permission.cloudwatch_groups	resource
aws_lambda_permission.cloudwatch_vpclogs	resource
aws_s3_bucket_notification.s3_bucket_notification	resource
archive_file.forwarder_rds	data source
archive_file.forwarder_vpclogs	data source
aws_caller_identity.current	data source
aws_cloudwatch_log_group.cloudwatch_log_group	data source
aws_iam_policy_document.assume_role	data source
aws_iam_policy_document.lambda_default	data source
aws_iam_policy_document.s3_log_bucket	data source
aws_partition.current	data source
aws_region.current	data source
aws_ssm_parameter.api_key	data source

Inputs

Name	Description	Type	Default	Required
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
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
cloudwatch_forwarder_log_groups	Map of CloudWatch Log Groups with a filter pattern that the Lambda forwarder will send logs from. For example: { mysql1 = { name = "/aws/rds/maincluster", filter_pattern = "" }	map(object({ name = string filter_pattern = string }))	`{}`	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
dd_api_key_kms_ciphertext_blob	CiphertextBlob stored in environment variable DD_KMS_API_KEY used by the lambda function, along with the KMS key, to decrypt Datadog API key	`string`	`""`	no
dd_api_key_source	One of: ARN for AWS Secrets Manager (asm) to retrieve the Datadog (DD) api key, ARN for the KMS (kms) key used to decrypt the ciphertext_blob of the api key, or the name of the SSM (ssm) parameter used to retrieve the Datadog API key	object({ resource = string identifier = string })	{ "identifier": "", "resource": "" }	no
dd_artifact_filename	The Datadog artifact filename minus extension	`string`	`"aws-dd-forwarder"`	no
dd_forwarder_version	Version tag of Datadog lambdas to use. https://github.com/DataDog/datadog-serverless-functions/releases	`string`	`"3.39.0"`	no
dd_module_name	The Datadog GitHub repository name	`string`	`"datadog-serverless-functions"`	no
dd_tags	A list of Datadog tags to apply to all logs forwarded to Datadog	`list(string)`	`[]`	no
dd_tags_map	A map of Datadog tags to apply to all logs forwarded to Datadog. This will override dd_tags.	`map(string)`	`{}`	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
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
forwarder_iam_path	Path to the IAM roles and policies created	`string`	`"/"`	no
forwarder_lambda_datadog_host	Datadog Site to send data to. Possible values are `datadoghq.com`, `datadoghq.eu`, `us3.datadoghq.com` and `ddog-gov.com`	`string`	`"datadoghq.com"`	no
forwarder_lambda_debug_enabled	Whether to enable or disable debug for the Lambda forwarder	`bool`	`false`	no
forwarder_log_artifact_url	The URL for the code of the Datadog forwarder for Logs. It can be a local file, URL or git repo	`string`	`null`	no
forwarder_log_enabled	Flag to enable or disable Datadog log forwarder	`bool`	`false`	no
forwarder_log_layers	List of Lambda Layer Version ARNs (maximum of 5) to attach to Datadog log forwarder lambda function	`list(string)`	`[]`	no
forwarder_log_retention_days	Number of days to retain Datadog forwarder lambda execution logs. One of [0 1 3 5 7 14 30 60 90 120 150 180 365 400 545 731 1827 3653]	`number`	`14`	no
forwarder_rds_artifact_url	The URL for the code of the Datadog forwarder for RDS. It can be a local file, url or git repo	`string`	`null`	no
forwarder_rds_enabled	Flag to enable or disable Datadog RDS enhanced monitoring forwarder	`bool`	`false`	no
forwarder_rds_filter_pattern	Filter pattern for Lambda forwarder RDS	`string`	`""`	no
forwarder_rds_layers	List of Lambda Layer Version ARNs (maximum of 5) to attach to Datadog RDS enhanced monitoring lambda function	`list(string)`	`[]`	no
forwarder_vpc_logs_artifact_url	The URL for the code of the Datadog forwarder for VPC Logs. It can be a local file, url or git repo	`string`	`null`	no
forwarder_vpc_logs_enabled	Flag to enable or disable Datadog VPC flow log forwarder	`bool`	`false`	no
forwarder_vpc_logs_layers	List of Lambda Layer Version ARNs (maximum of 5) to attach to Datadog VPC flow log forwarder lambda function	`list(string)`	`[]`	no
forwarder_vpclogs_filter_pattern	Filter pattern for Lambda forwarder VPC Logs	`string`	`""`	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
kms_key_id	Optional KMS key ID to encrypt Datadog Lambda function logs	`string`	`null`	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_memory_size	Amount of memory in MB your Lambda Function can use at runtime	`number`	`128`	no
lambda_policy_source_json	Additional IAM policy document that can optionally be passed and merged with the created policy document	`string`	`""`	no
lambda_reserved_concurrent_executions	Amount of reserved concurrent executions for the lambda function. A value of 0 disables Lambda from being triggered and -1 removes any concurrency limitations. Defaults to Unreserved Concurrency Limits -1	`number`	`-1`	no
lambda_runtime	Runtime environment for Datadog Lambda	`string`	`"python3.7"`	no
lambda_timeout	Amount of time your Datadog Lambda Function has to run in seconds	`number`	`120`	no
log_permissions_boundary	ARN of the policy that is used to set the permissions boundary for the lambda-log role managed by this module.	`string`	`null`	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
rds_permissions_boundary	ARN of the policy that is used to set the permissions boundary for the lambda-rds role managed by this module.	`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
s3_bucket_kms_arns	List of KMS key ARNs for s3 bucket encryption	`list(string)`	`[]`	no
s3_buckets	The names and ARNs of S3 buckets to forward logs to Datadog	`list(string)`	`null`	no
security_group_ids	List of security group IDs to use when the Lambda Function runs in a VPC	`list(string)`	`null`	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	`string`	`null`	no
subnet_ids	List of subnet IDs to use when deploying the Lambda Function in a VPC	`list(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
tracing_config_mode	Can be either PassThrough or Active. If PassThrough, Lambda will only trace the request from an upstream service if it contains a tracing header with 'sampled=1'. If Active, Lambda will respect any tracing header it receives from an upstream service	`string`	`"PassThrough"`	no
vpc_logs_permissions_boundary	ARN of the policy that is used to set the permissions boundary for the lambda-vpc-logs role managed by this module.	`string`	`null`	no
vpclogs_cloudwatch_log_group	The name of the CloudWatch Log Group for VPC flow logs	`string`	`null`	no

Outputs

Name	Description
lambda_forwarder_log_function_arn	Datadog Lambda forwarder CloudWatch/S3 function ARN
lambda_forwarder_log_function_name	Datadog Lambda forwarder CloudWatch/S3 function name
lambda_forwarder_rds_enhanced_monitoring_function_name	Datadog Lambda forwarder RDS Enhanced Monitoring function name
lambda_forwarder_rds_function_arn	Datadog Lambda forwarder RDS Enhanced Monitoring function ARN
lambda_forwarder_vpc_log_function_arn	Datadog Lambda forwarder VPC Flow Logs function ARN
lambda_forwarder_vpc_log_function_name	Datadog Lambda forwarder VPC Flow Logs function name

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Related Projects

Check out these related projects.

terraform-null-label - Terraform module designed to generate consistent names and tags for resources. Use terraform-null-label to implement a strict naming convention.

References

For additional context, refer to some of these links.

Terraform Standard Module Structure - HashiCorp's standard module structure is a file and directory layout we recommend for reusable modules distributed in separate repositories.
Terraform Module Requirements - HashiCorp's guidance on all the requirements for publishing a module. Meeting the requirements for publishing a module is extremely easy.
Terraform random_integer Resource - The resource random_integer generates random values from a given range, described by the min and max attributes of a given resource.
Terraform Version Pinning - The required_version setting can be used to constrain which versions of the Terraform CLI can be used with your configuration

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Copyrights

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

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Contributors

PePe Amengual	RB	Erik Osterman	Andriy Knysh

Name		Name	Last commit message	Last commit date
Latest commit History 26 Commits
.github		.github
docs		docs
examples/complete		examples/complete
test		test
.editorconfig		.editorconfig
.gitignore		.gitignore
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
README.yaml		README.yaml
context.tf		context.tf
lambda-log.tf		lambda-log.tf
lambda-rds.tf		lambda-rds.tf
lambda-vpc-logs.tf		lambda-vpc-logs.tf
main.tf		main.tf
outputs.tf		outputs.tf
variables.tf		variables.tf
versions.tf		versions.tf

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