Datadog Terraform module for AWS Lambda

Use this Terraform module to install Datadog Serverless Monitoring for AWS Lambda.

This Terraform module wraps the aws_lambda_function resource and automatically configures your Lambda function for Datadog Serverless Monitoring by:

• Adding the Datadog Lambda layers
• Redirecting the Lambda handler
• Enabling the collection of metrics, traces, and logs to Datadog

Usage

Python

module "example_lambda_function" {
  source = "Datadog/lambda-datadog/aws"

  filename      = "example.zip"
  function_name = "example-function"
  role          = aws_iam_role.lambda_role.arn
  handler       = "app.lambda_handler"
  runtime       = "python3.11"
  memory_size = 256

  environment_variables = {
    "DD_API_KEY_SECRET_ARN" : "arn:aws:secretsmanager:us-east-1:000000000000:secret:example-secret"
    "DD_ENV" : "dev"
    "DD_SERVICE" : "example-service"
    "DD_VERSION" : "1.0.0"
  }

  datadog_extension_layer_version = 57
  datadog_python_layer_version = 94
}

Node

module "example_lambda_function" {
  source = "Datadog/lambda-datadog/aws"

  filename      = "example.zip"
  function_name = "example-function"
  role          = aws_iam_role.lambda_role.arn
  handler       = "index.lambda_handler"
  runtime       = "nodejs20.x"
  memory_size = 256

  environment_variables = {
    "DD_API_KEY_SECRET_ARN" : "arn:aws:secretsmanager:us-east-1:000000000000:secret:example-secret"
    "DD_ENV" : "dev"
    "DD_SERVICE" : "example-service"
    "DD_VERSION" : "1.0.0"
  }

  datadog_extension_layer_version = 57
  datadog_node_layer_version = 109
}

Configuration

Lambda Function

All of the arguments available in the aws_lambda_function resource are available in this Terraform module.

Arguments defined as blocks in the aws_lambda_function resource are redefined as variables with their nested arguments.

For example, in aws_lambda_function, environment is defined as a block with a variables argument. In this Terraform module, the value for the environment_variables is passed to the environment.variables argument in aws_lambda_function. See variables.tf for a complete list of variables in this module.

aws_lambda_function resource

resource "aws_lambda_function" "example_lambda_function" {
  function_name = "example-function"  
  ...

  environment {
    variables = {
        "DD_API_KEY_SECRET_ARN" : "arn:aws:secretsmanager:us-east-1:000000000000:secret:example-secret"
        "DD_ENV" : "dev"
        "DD_SERVICE" : "example-service"
        "DD_VERSION" : "1.0.0"
    }
  }
  ...
}

Datadog Terraform module for AWS Lambda

module "example_lambda_function" {
  source = "Datadog/lambda-datadog/aws"

  function_name = "example-function"  
  ...

  environment_variables = {
    "DD_API_KEY_SECRET_ARN" : "arn:aws:secretsmanager:us-east-1:000000000000:secret:example-secret"
    "DD_ENV" : "dev"
    "DD_SERVICE" : "example-service"
    "DD_VERSION" : "1.0.0"
  }
  ...
}

Datadog

Selecting the layer versions

Use the following variables to select the versions of the Datadog Lambda layers to use. If no layer version is specified the latest version will be used.

Variable	Description
datadog_extension_layer_version	Version of the Datadog Lambda Extension layer to install
datadog_node_layer_version	Version of the Datadog Node Lambda layer to install
datadog_python_layer_version	Version of the Datadog Python Lambda layer to install

Configuration

Use Environment variables to configure Datadog Serverless Monitoring. Refer to the documentation below for environment variables available in the Serverless Agent (packaged in the Extension layer) and in the Tracing libraries (packaged in the runtime layers).

• Serverless Agent Configuration
• Tracer Configuration
  • Node
  • Python

Requirements

Name	Version
terraform	>= 1.3
aws	>= 5.32.0

Providers

Name	Version
aws	>= 5.32.0

Modules

No modules.

Resources

Name	Type
aws_lambda_function.this	resource
aws_region.current	data source

Inputs

Name	Description	Type	Default	Required
architectures	Instruction set architecture for your Lambda function. Valid values are ["x86_64"] and ["arm64"].	list(string)	["x86_64"]	no
code_signing_config_arn	To enable code signing for this function, specify the ARN of a code-signing configuration. A code-signing configuration includes a set of signing profiles, which define the trusted publishers for this function.	string	null	no
datadog_extension_layer_version	Version for the Datadog Extension Layer	number	57	no
datadog_node_layer_version	Version for the Datadog Node Layer	number	109	no
datadog_python_layer_version	Version for the Datadog Python Layer	number	94	no
dead_letter_config_target_arn	ARN of an SNS topic or SQS queue to notify when an invocation fails.	string	null	no
description	Description of what your Lambda Function does.	string	null	no
environment_variables	Map of environment variables that are accessible from the function code during execution.	map(string)	{}	no
ephemeral_storage_size	The amount of Ephemeral storage(/tmp) to allocate for the Lambda Function in MB.	number	null	no
file_system_config_arn	Amazon Resource Name (ARN) of the Amazon EFS Access Point that provides access to the file system.	string	null	no
file_system_config_local_mount_path	Path where the function can access the file system, starting with /mnt/.	string	null	no
filename	Path to the function's deployment package within the local filesystem.	string	null	no
function_name	Unique name for your Lambda Function.	string	null	no
handler	Function entrypoint in your code.	string	null	no
image_config_command	Parameters that you want to pass in with entry_point.	list(string)	null	no
image_config_entry_point	Entry point to your application, which is typically the location of the runtime executable.	list(string)	null	no
image_config_working_directory	Working directory.	string	null	no
image_uri	ECR image URI containing the function's deployment package.	string	null	no
kms_key_arn	Amazon Resource Name (ARN) of the AWS Key Management Service (KMS) key that is used to encrypt environment variables.	string	null	no
layers	List of Lambda Layer Version ARNs (maximum of 5) to attach to your Lambda Function.	list(string)	[]	no
logging_config_application_log_level	For JSON structured logs, choose the detail level of the logs your application sends to CloudWatch when using supported logging libraries.	string	null	no
logging_config_log_format	Select between Text and structured JSON format for your function's logs.	string	null	no
logging_config_log_group	The CloudWatch log group your function sends logs to.	string	null	no
logging_config_system_log_level	For JSON structured logs, choose the detail level of the Lambda platform event logs sent to CloudWatch, such as ERROR, DEBUG, or INFO.	string	null	no
memory_size	Amount of memory in MB your Lambda Function can use at runtime.	number	null	no
package_type	Lambda deployment package type.	string	null	no
publish	Whether to publish creation/change as new Lambda Function Version.	bool	null	no
reserved_concurrent_executions	Amount of reserved concurrent executions for this lambda function.	number	null	no
role	Amazon Resource Name (ARN) of the function's execution role. The role provides the function's identity and access to AWS services and resources.	string	null	no
runtime	Identifier of the function's runtime.	string	null	no
s3_bucket	S3 bucket location containing the function's deployment package.	string	null	no
s3_key	S3 key of an object containing the function's deployment package.	string	null	no
s3_object_version	Object version containing the function's deployment package.	string	null	no
skip_destroy	Set to true if you do not wish the function to be deleted at destroy time, and instead just remove the function from the Terraform state.	bool	null	no
snap_start_apply_on	Conditions where snap start is enabled.	string	null	no
source_code_hash	Used to trigger updates. Must be set to a base64-encoded SHA256 hash of the package file specified with either filename or s3_key.	string	null	no
tags	Map of tags to assign to the object.	map(string)	null	no
timeout	Amount of time your Lambda Function has to run in seconds.	number	null	no
tracing_config_mode	Whether to sample and trace a subset of incoming requests with AWS X-Ray.	string	null	no
vpc_config_ipv6_allowed_for_dual_stack	Allows outbound IPv6 traffic on VPC functions that are connected to dual-stack subnets.	bool	null	no
vpc_config_security_group_ids	List of security group IDs associated with the Lambda function.	set(string)	null	no
vpc_config_subnet_ids	List of subnet IDs associated with the Lambda function.	set(string)	null	no

Outputs

Name	Description
architectures	Instruction set architecture for your Lambda function.
arn	Amazon Resource Name (ARN) identifying your Lambda Function.
code_signing_config_arn	To enable code signing for this function, specify the ARN of a code-signing configuration.
dead_letter_config	ARN of an SNS topic or SQS queue to notify when an invocation fails.
description	Description of what your Lambda Function does.
environment	Map of environment variables that are accessible from the function code during execution.
ephemeral_storage	The amount of Ephemeral storage(/tmp) to allocate for the Lambda Function in MB.
file_system_config	Connection settings for an EFS file system.
filename	Path to the function's deployment package within the local filesystem.
function_name	Unique name for your Lambda Function
handler	Function entrypoint in your code.
image_config	Container image configuration values that override the values in the container image Dockerfile.
image_uri	ECR image URI containing the function's deployment package.
invoke_arn	ARN to be used for invoking Lambda Function from API Gateway.
kms_key_arn	Amazon Resource Name (ARN) of the AWS Key Management Service (KMS) key that is used to encrypt environment variables.
last_modified	Date this resource was last modified.
layers	List of Lambda Layer Version ARNs (maximum of 5) to attach to your Lambda Function.
logging_config	Advanced logging settings.
memory_size	Amount of memory in MB your Lambda Function can use at runtime.
package_type	Lambda deployment package type.
publish	Whether to publish creation/change as new Lambda Function Version.
qualified_arn	ARN identifying your Lambda Function Version.
qualified_invoke_arn	Qualified ARN (ARN with lambda version number) to be used for invoking Lambda Function from API Gateway.
reserved_concurrent_executions	Amount of reserved concurrent executions for this lambda function.
runtime	Identifier of the function's runtime.
s3_bucket	S3 bucket location containing the function's deployment package.
s3_key	S3 key of an object containing the function's deployment package.
s3_object_version	Object version containing the function's deployment package.
signing_job_arn	ARN of the signing job.
signing_profile_version_arn	ARN of the signing profile version.
skip_destroy	Set to true if you do not wish the function to be deleted at destroy time, and instead just remove the function from the Terraform state.
snap_start	Snap start settings for low-latency startups.
source_code_hash	Used to trigger updates. Must be set to a base64-encoded SHA256 hash of the package file specified with either filename or s3_key.
source_code_size	Size in bytes of the function .zip file.
tags	Map of tags to assign to the object.
tags_all	A map of tags assigned to the resource, including those inherited from the provider.
timeout	Amount of time your Lambda Function has to run in seconds.
tracing_config	Tracing settings.
version	Latest published version of your Lambda Function.
vpc_config	VPC settings.