AWS Lambda Terraform module

Terraform module, which creates almost all supported AWS Lambda resources as well as taking care of building and packaging of required Lambda dependencies for functions and layers.

This Terraform module is the part of serverless.tf framework, which aims to simplify all operations when working with the serverless in Terraform:

Build and install dependencies - read more. Requires Python 3.6 or newer.
Create, store, and use deployment packages - read more.
Create, update, and publish AWS Lambda Function and Lambda Layer - see usage.
Create static and dynamic aliases for AWS Lambda Function - see usage, see modules/alias.
Do complex deployments (eg, rolling, canary, rollbacks, triggers) - read more, see modules/deploy.
Use AWS SAM CLI to test Lambda Function - read more.

Features

Build dependencies for your Lambda Function and Layer.
Support builds locally and in Docker (with or without SSH agent support for private builds) for any runtime and architecture supported by AWS Lambda.
Create deployment package or deploy existing (previously built package) from local, from S3, from URL, or from AWS ECR repository.
Store deployment packages locally or in the S3 bucket.
Support almost all features of Lambda resources (function, layer, alias, etc.)
Lambda@Edge
Conditional creation for many types of resources.
Control execution of nearly any step in the process - build, package, store package, deploy, update.
Control nearly all aspects of Lambda resources (provisioned concurrency, VPC, EFS, dead-letter notification, tracing, async events, event source mapping, IAM role, IAM policies, and more).
Support integration with other serverless.tf modules like HTTP API Gateway (see examples there).

Usage

Lambda Function (store package locally)

module "lambda_function" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = "my-lambda1"
  description   = "My awesome lambda function"
  handler       = "index.lambda_handler"
  runtime       = "python3.12"

  source_path = "../src/lambda-function1"

  tags = {
    Name = "my-lambda1"
  }
}

Lambda Function and Lambda Layer (store packages on S3)

module "lambda_function" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = "lambda-with-layer"
  description   = "My awesome lambda function"
  handler       = "index.lambda_handler"
  runtime       = "python3.12"
  publish       = true

  source_path = "../src/lambda-function1"

  store_on_s3 = true
  s3_bucket   = "my-bucket-id-with-lambda-builds"

  layers = [
    module.lambda_layer_s3.lambda_layer_arn,
  ]

  environment_variables = {
    Serverless = "Terraform"
  }

  tags = {
    Module = "lambda-with-layer"
  }
}

module "lambda_layer_s3" {
  source = "terraform-aws-modules/lambda/aws"

  create_layer = true

  layer_name          = "lambda-layer-s3"
  description         = "My amazing lambda layer (deployed from S3)"
  compatible_runtimes = ["python3.12"]

  source_path = "../src/lambda-layer"

  store_on_s3 = true
  s3_bucket   = "my-bucket-id-with-lambda-builds"
}

Lambda Functions with existing package (prebuilt) stored locally

module "lambda_function_existing_package_local" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = "my-lambda-existing-package-local"
  description   = "My awesome lambda function"
  handler       = "index.lambda_handler"
  runtime       = "python3.12"

  create_package         = false
  local_existing_package = "../existing_package.zip"
}

Lambda Function or Lambda Layer with the deployable artifact maintained separately from the infrastructure

If you want to manage function code and infrastructure resources (such as IAM permissions, policies, events, etc) in separate flows (e.g., different repositories, teams, CI/CD pipelines).

Disable source code tracking to turn off deployments (and rollbacks) using the module by setting ignore_source_code_hash = true and deploy a dummy function.

When the infrastructure and the dummy function is deployed, you can use external tool to update the source code of the function (eg, using AWS CLI) and keep using this module via Terraform to manage the infrastructure.

Be aware that changes in local_existing_package value may trigger deployment via Terraform.

module "lambda_function_externally_managed_package" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = "my-lambda-externally-managed-package"
  description   = "My lambda function code is deployed separately"
  handler       = "index.lambda_handler"
  runtime       = "python3.12"

  create_package         = false
  local_existing_package = "./lambda_functions/code.zip"

  ignore_source_code_hash = true
}

Lambda Function with existing package (prebuilt) stored in S3 bucket

Note that this module does not copy prebuilt packages into S3 bucket. This module can only store packages it builds locally and in S3 bucket.

locals {
  my_function_source = "../path/to/package.zip"
}

resource "aws_s3_bucket" "builds" {
  bucket = "my-builds"
  acl    = "private"
}

resource "aws_s3_object" "my_function" {
  bucket = aws_s3_bucket.builds.id
  key    = "${filemd5(local.my_function_source)}.zip"
  source = local.my_function_source
}

module "lambda_function_existing_package_s3" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = "my-lambda-existing-package-local"
  description   = "My awesome lambda function"
  handler       = "index.lambda_handler"
  runtime       = "python3.12"

  create_package      = false
  s3_existing_package = {
    bucket = aws_s3_bucket.builds.id
    key    = aws_s3_object.my_function.id
  }
}

Lambda Functions from Container Image stored on AWS ECR

module "lambda_function_container_image" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = "my-lambda-existing-package-local"
  description   = "My awesome lambda function"

  create_package = false

  image_uri    = "132367819851.dkr.ecr.eu-west-1.amazonaws.com/complete-cow:1.0"
  package_type = "Image"
}

Lambda Layers (store packages locally and on S3)

module "lambda_layer_local" {
  source = "terraform-aws-modules/lambda/aws"

  create_layer = true

  layer_name          = "my-layer-local"
  description         = "My amazing lambda layer (deployed from local)"
  compatible_runtimes = ["python3.12"]

  source_path = "../fixtures/python-app1"
}

module "lambda_layer_s3" {
  source = "terraform-aws-modules/lambda/aws"

  create_layer = true

  layer_name          = "my-layer-s3"
  description         = "My amazing lambda layer (deployed from S3)"
  compatible_runtimes = ["python3.12"]

  source_path = "../fixtures/python-app1"

  store_on_s3 = true
  s3_bucket   = "my-bucket-id-with-lambda-builds"
}

Lambda@Edge

Make sure, you deploy Lambda@Edge functions into US East (N. Virginia) region (us-east-1). See Requirements and Restrictions on Lambda Functions.

module "lambda_at_edge" {
  source = "terraform-aws-modules/lambda/aws"

  lambda_at_edge = true

  function_name = "my-lambda-at-edge"
  description   = "My awesome lambda@edge function"
  handler       = "index.lambda_handler"
  runtime       = "python3.12"

  source_path = "../fixtures/python-app1"

  tags = {
    Module = "lambda-at-edge"
  }
}

Lambda Function in VPC

module "lambda_function_in_vpc" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = "my-lambda-in-vpc"
  description   = "My awesome lambda function"
  handler       = "index.lambda_handler"
  runtime       = "python3.12"

  source_path = "../fixtures/python-app1"

  vpc_subnet_ids         = module.vpc.intra_subnets
  vpc_security_group_ids = [module.vpc.default_security_group_id]
  attach_network_policy = true
}

module "vpc" {
  source = "terraform-aws-modules/vpc/aws"

  name = "my-vpc"
  cidr = "10.10.0.0/16"

  # Specify at least one of: intra_subnets, private_subnets, or public_subnets
  azs           = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]
  intra_subnets = ["10.10.101.0/24", "10.10.102.0/24", "10.10.103.0/24"]
}

Additional IAM policies for Lambda Functions

There are 6 supported ways to attach IAM policies to IAM role used by Lambda Function:

policy_json - JSON string or heredoc, when attach_policy_json = true.
policy_jsons - List of JSON strings or heredoc, when attach_policy_jsons = true and number_of_policy_jsons > 0.
policy - ARN of existing IAM policy, when attach_policy = true.
policies - List of ARNs of existing IAM policies, when attach_policies = true and number_of_policies > 0.
policy_statements - Map of maps to define IAM statements which will be generated as IAM policy. Requires attach_policy_statements = true. See examples/complete for more information.
assume_role_policy_statements - Map of maps to define IAM statements which will be generated as IAM policy for assuming Lambda Function role (trust relationship). See examples/complete for more information.

Lambda Permissions for allowed triggers

Lambda Permissions should be specified to allow certain resources to invoke Lambda Function.

module "lambda_function" {
  source = "terraform-aws-modules/lambda/aws"

  # ...omitted for brevity

  allowed_triggers = {
    Config = {
      principal        = "config.amazonaws.com"
      principal_org_id = "o-abcdefghij"
    }
    APIGatewayAny = {
      service    = "apigateway"
      source_arn = "arn:aws:execute-api:eu-west-1:135367859851:aqnku8akd0/*/*/*"
    },
    APIGatewayDevPost = {
      service    = "apigateway"
      source_arn = "arn:aws:execute-api:eu-west-1:135367859851:aqnku8akd0/dev/POST/*"
    },
    OneRule = {
      principal  = "events.amazonaws.com"
      source_arn = "arn:aws:events:eu-west-1:135367859851:rule/RunDaily"
    }
  }
}

Conditional creation

Sometimes you need to have a way to create resources conditionally but Terraform does not allow usage of count inside module block, so the solution is to specify create arguments.

module "lambda" {
  source = "terraform-aws-modules/lambda/aws"

  create = false # to disable all resources

  create_package  = false  # to control build package process
  create_function = false  # to control creation of the Lambda Function and related resources
  create_layer    = false  # to control creation of the Lambda Layer and related resources
  create_role     = false  # to control creation of the IAM role and policies required for Lambda Function

  attach_cloudwatch_logs_policy = false
  attach_dead_letter_policy     = false
  attach_network_policy         = false
  attach_tracing_policy         = false
  attach_async_event_policy     = false

  # ... omitted
}

How does building and packaging work?

This is one of the most complicated part done by the module and normally you don't have to know internals.

package.py is Python script which does it. Make sure, Python 3.6 or newer is installed. The main functions of the script are to generate a filename of zip-archive based on the content of the files, verify if zip-archive has been already created, and create zip-archive only when it is necessary (during apply, not plan).

Hash of zip-archive created with the same content of the files is always identical which prevents unnecessary force-updates of the Lambda resources unless content modifies. If you need to have different filenames for the same content you can specify extra string argument hash_extra.

When calling this module multiple times in one execution to create packages with the same source_path, zip-archives will be corrupted due to concurrent writes into the same file. There are two solutions - set different values for hash_extra to create different archives, or create package once outside (using this module) and then pass local_existing_package argument to create other Lambda resources.

Debug

Building and packaging has been historically hard to debug (especially with Terraform), so we made an effort to make it easier for user to see debug info. There are 3 different debug levels: DEBUG - to see only what is happening during planning phase and how a zip file content filtering in case of applied patterns, DEBUG2 - to see more logging output, DEBUG3 - to see all logging values, DUMP_ENV - to see all logging values and env variables (be careful sharing your env variables as they may contain secrets!).

User can specify debug level like this:

export TF_LAMBDA_PACKAGE_LOG_LEVEL=DEBUG2
terraform apply

User can enable comments in heredoc strings in patterns which can be helpful in some situations. To do this set this environment variable:

export TF_LAMBDA_PACKAGE_PATTERN_COMMENTS=true
terraform apply

Build Dependencies

You can specify source_path in a variety of ways to achieve desired flexibility when building deployment packages locally or in Docker. You can use absolute or relative paths. If you have placed terraform files in subdirectories, note that relative paths are specified from the directory where terraform plan is run and not the location of your terraform file.

Note that, when building locally, files are not copying anywhere from the source directories when making packages, we use fast Python regular expressions to find matching files and directories, which makes packaging very fast and easy to understand.

Simple build from single directory

When source_path is set to a string, the content of that path will be used to create deployment package as-is:

source_path = "src/function1"

Static build from multiple source directories

When source_path is set to a list of directories the content of each will be taken and one archive will be created.

Combine various options for extreme flexibility

This is the most complete way of creating a deployment package from multiple sources with multiple dependencies. This example is showing some of the available options (see examples/build-package and examples/runtimes for more):

source_path = [
  "src/main-source",
  "src/another-source/index.py",
  {
    path     = "src/function1-dep",
    patterns = [
      "!.*/.*\\.txt", # Skip all txt files recursively
    ]
  }, {
    path             = "src/python-app1",
    pip_requirements = true,
    pip_tmp_dir      = "/tmp/dir/location"
    prefix_in_zip    = "foo/bar1",
  }, {
    path             = "src/python-app2",
    pip_requirements = "requirements-large.txt",
    patterns = [
      "!vendor/colorful-0.5.4.dist-info/RECORD",
      "!vendor/colorful-.+.dist-info/.*",
      "!vendor/colorful/__pycache__/?.*",
    ]
  }, {
    path             = "src/nodejs14.x-app1",
    npm_requirements = true,
    npm_tmp_dir      = "/tmp/dir/location"
    prefix_in_zip    = "foo/bar1",
  }, {
    path     = "src/python-app3",
    commands = [
      "npm install",
      ":zip"
    ],
    patterns = [
      "!.*/.*\\.txt",    # Skip all txt files recursively
      "node_modules/.+", # Include all node_modules
    ],
  }, {
    path     = "src/python-app3",
    commands = ["go build"],
    patterns = <<END
      bin/.*
      abc/def/.*
    END
  }
]

Few notes:

If you specify a source path as a string that references a folder and the runtime begins with python or nodejs, the build process will automatically build python and nodejs dependencies if requirements.txt or package.json file will be found in the source folder. If you want to customize this behavior, please use the object notation as explained below.
All arguments except path are optional.
patterns - List of Python regex filenames should satisfy. Default value is "include everything" which is equal to patterns = [".*"]. This can also be specified as multiline heredoc string (no comments allowed). Some examples of valid patterns:
If you use the commands option and chain multiple commands, only the exit code of last command will be checked for success. If you prefer to fail fast, start the commands with the bash option set -e or powershell option $ErrorActionPreference="Stop"

    !.*/.*\.txt        # Filter all txt files recursively
    node_modules/.*    # Include empty dir or with a content if it exists
    node_modules/.+    # Include full non empty node_modules dir with its content
    node_modules/      # Include node_modules itself without its content
                       # It's also a way to include an empty dir if it exists
    node_modules       # Include a file or an existing dir only

    !abc/.*            # Filter out everything in an abc folder
    abc/def/.*         # Re-include everything in abc/def sub folder
    !abc/def/hgk/.*    # Filter out again in abc/def/hgk sub folder

commands - List of commands to run. If specified, this argument overrides pip_requirements and npm_requirements.
- :zip [source] [destination] is a special command which creates content of current working directory (first argument) and places it inside of path (second argument).
pip_requirements - Controls whether to execute pip install. Set to false to disable this feature, true to run pip install with requirements.txt found in path. Or set to another filename which you want to use instead. When source_path is passed as a string containing a path (and not a list of maps), and requirements.txt is present, pip install is automatically executed.
pip_tmp_dir - Set the base directory to make the temporary directory for pip installs. Can be useful for Docker in Docker builds.
poetry_install - Controls whether to execute poetry export and pip install. Set to false to disable this feature, true to run poetry export with pyproject.toml and poetry.lock found in path. When source_path is passed as a string containing a path (and not a list of maps), and pyproject.toml with a build system poetry is present, poetry export and pip install are automatically executed.
poetry_export_extra_args - A list of additional poetry arguments to add to the poetry export command
npm_requirements - Controls whether to execute npm install. Set to false to disable this feature, true to run npm install with package.json found in path. Or set to another filename which you want to use instead.
npm_tmp_dir - Set the base directory to make the temporary directory for npm installs. Can be useful for Docker in Docker builds.
prefix_in_zip - If specified, will be used as a prefix inside zip-archive. By default, everything installs into the root of zip-archive.

Building in Docker

If your Lambda Function or Layer uses some dependencies you can build them in Docker and have them included into deployment package. Here is how you can do it:

build_in_docker   = true
docker_file       = "src/python-app1/docker/Dockerfile"
docker_build_root = "src/python-app1/docker"
docker_image      = "public.ecr.aws/sam/build-python"
runtime           = "python3.12"    # Setting runtime is required when building package in Docker and Lambda Layer resource.

Using this module you can install dependencies from private hosts. To do this, you need for forward SSH agent:

docker_with_ssh_agent = true

Note that by default, the docker_image used comes from the registry public.ecr.aws/sam/, and will be based on the runtime that you specify. In other words, if you specify a runtime of python3.12 and do not specify docker_image, then the docker_image will resolve to public.ecr.aws/sam/build-python3.12. This ensures that by default the runtime is available in the docker container.

If you override docker_image, be sure to keep the image in sync with your runtime. During the plan phase, when using docker, there is no check that the runtime is available to build the package. That means that if you use an image that does not have the runtime, the plan will still succeed, but then the apply will fail.

Passing additional Docker options

To add flexibility when building in docker, you can pass any number of additional options that you require (see Docker run reference for available options):

  docker_additional_options = [
        "-e", "MY_ENV_VAR='My environment variable value'",
        "-v", "/local:/docker-vol",
  ]

Overriding Docker Entrypoint

To override the docker entrypoint when building in docker, set docker_entrypoint:

  docker_entrypoint = "/entrypoint/entrypoint.sh"

The entrypoint must map to a path within your container, so you need to either build your own image that contains the entrypoint or map it to a file on the host by mounting a volume (see Passing additional Docker options).

Deployment package - Create or use existing

By default, this module creates deployment package and uses it to create or update Lambda Function or Lambda Layer.

Sometimes, you may want to separate build of deployment package (eg, to compile and install dependencies) from the deployment of a package into two separate steps.

When creating archive locally outside of this module you need to set create_package = false and then argument local_existing_package = "existing_package.zip". Alternatively, you may prefer to keep your deployment packages into S3 bucket and provide a reference to them like this:

  create_package      = false
  s3_existing_package = {
    bucket = "my-bucket-with-lambda-builds"
    key    = "existing_package.zip"
  }

Using deployment package from remote URL

This can be implemented in two steps: download file locally using CURL, and pass path to deployment package as local_existing_package argument.

locals {
  package_url = "https://raw.githubusercontent.com/terraform-aws-modules/terraform-aws-lambda/master/examples/fixtures/python-zip/existing_package.zip"
  downloaded  = "downloaded_package_${md5(local.package_url)}.zip"
}

resource "null_resource" "download_package" {
  triggers = {
    downloaded = local.downloaded
  }

  provisioner "local-exec" {
    command = "curl -L -o ${local.downloaded} ${local.package_url}"
  }
}

data "null_data_source" "downloaded_package" {
  inputs = {
    id       = null_resource.download_package.id
    filename = local.downloaded
  }
}

module "lambda_function_existing_package_from_remote_url" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = "my-lambda-existing-package-local"
  description   = "My awesome lambda function"
  handler       = "index.lambda_handler"
  runtime       = "python3.12"

  create_package         = false
  local_existing_package = data.null_data_source.downloaded_package.outputs["filename"]
}

How to use AWS SAM CLI to test Lambda Function?

AWS SAM CLI is an open source tool that help the developers to initiate, build, test, and deploy serverless applications. SAM CLI tool supports Terraform applications.

SAM CLI provides two ways of testing: local testing and testing on-cloud (Accelerate).

Local Testing

Using SAM CLI, you can invoke the lambda functions defined in the terraform application locally using the sam local invoke command, providing the function terraform address, or function name, and to set the hook-name to terraform to tell SAM CLI that the underlying project is a terraform application.

You can execute the sam local invoke command from your terraform application root directory as following:

sam local invoke --hook-name terraform module.hello_world_function.aws_lambda_function.this[0]

You can also pass an event to your lambda function, or overwrite its environment variables. Check here for more information.

You can also invoke your lambda function in debugging mode, and step-through your lambda function source code locally in your preferred editor. Check here for more information.

Testing on-cloud (Accelerate)

You can use AWS SAM CLI to quickly test your application on your AWS development account. Using SAM Accelerate, you will be able to develop your lambda functions locally, and once you save your updates, SAM CLI will update your development account with the updated Lambda functions. So, you can test it on cloud, and if there is any bug, you can quickly update the code, and SAM CLI will take care of pushing it to the cloud. Check here for more information about SAM Accelerate.

You can execute the sam sync command from your terraform application root directory as following:

sam sync --hook-name terraform --watch

How to deploy and manage Lambda Functions?

Simple deployments

Typically, Lambda Function resource updates when source code changes. If publish = true is specified a new Lambda Function version will also be created.

Published Lambda Function can be invoked using either by version number or using $LATEST. This is the simplest way of deployment which does not required any additional tool or service.

Controlled deployments (rolling, canary, rollbacks)

In order to do controlled deployments (rolling, canary, rollbacks) of Lambda Functions we need to use Lambda Function aliases.

In simple terms, Lambda alias is like a pointer to either one version of Lambda Function (when deployment complete), or to two weighted versions of Lambda Function (during rolling or canary deployment).

One Lambda Function can be used in multiple aliases. Using aliases gives large control of which version deployed when having multiple environments.

There is alias module, which simplifies working with alias (create, manage configurations, updates, etc). See examples/alias for various use-cases how aliases can be configured and used.

There is deploy module, which creates required resources to do deployments using AWS CodeDeploy. It also creates the deployment, and wait for completion. See examples/deploy for complete end-to-end build/update/deploy process.

Terraform CI/CD

Terraform Cloud, Terraform Enterprise, and many other SaaS for running Terraform do not have Python pre-installed on the workers. You will need to provide an alternative Docker image with Python installed to be able to use this module there.

FAQ

Q1: Why deployment package not recreating every time I change something? Or why deployment package is being recreated every time but content has not been changed?

Answer: There can be several reasons related to concurrent executions, or to content hash. Sometimes, changes has happened inside of dependency which is not used in calculating content hash. Or multiple packages are creating at the same time from the same sources. You can force it by setting value of hash_extra to distinct values.

Q2: How to force recreate deployment package?

Answer: Delete an existing zip-archive from builds directory, or make a change in your source code. If there is no zip-archive for the current content hash, it will be recreated during terraform apply.

Q3: null_resource.archive[0] must be replaced

Answer: This probably mean that zip-archive has been deployed, but is currently absent locally, and it has to be recreated locally. When you run into this issue during CI/CD process (where workspace is clean) or from multiple workspaces, you can set environment variable TF_RECREATE_MISSING_LAMBDA_PACKAGE=false or pass recreate_missing_package = false as a parameter to the module and run terraform apply. Alternatively, you can pass trigger_on_package_timestamp = false as a parameter to ignore the file timestamp when deciding to create the archive or not.

Q4: What does this error mean - "We currently do not support adding policies for $LATEST." ?

Answer: When the Lambda function is created with publish = true the new version is automatically increased and a qualified identifier (version number) becomes available and will be used when setting Lambda permissions.

When publish = false (default), only unqualified identifier ($LATEST) is available which leads to the error.

The solution is to either disable the creation of Lambda permissions for the current version by setting create_current_version_allowed_triggers = false, or to enable publish of Lambda function (publish = true).

Notes

Creation of Lambda Functions and Lambda Layers is very similar and both support the same features (building from source path, using existing package, storing package locally or on S3)
Check out this Awesome list of AWS Lambda Layers

Examples

Complete - Create Lambda resources in various combinations with all supported features.
Container Image - Create a Docker image with a platform specified in the Dockerfile (using docker provider), push it to AWS ECR, and create Lambda function from it.
Build and Package - Build and create deployment packages in various ways.
Runtimes - Build and create deployment packages for various runtimes (such as Rust, Go, Java).
Alias - Create static and dynamic aliases in various ways.
Deploy - Complete end-to-end build/update/deploy process using AWS CodeDeploy.
Async Invocations - Create Lambda Function with async event configuration (with SQS, SNS, and EventBridge integration).
With VPC - Create Lambda Function with VPC.
With VPC and VPC Endpoint for S3 - Create Lambda Function with VPC and VPC Endpoint for S3.
With EFS - Create Lambda Function with Elastic File System attached (Terraform 0.13+ is recommended).
Multiple regions - Create the same Lambda Function in multiple regions with non-conflicting IAM roles and policies.
Event Source Mapping - Create Lambda Function with event source mapping configuration (SQS, DynamoDB, Amazon MQ, and Kinesis).
Triggers - Create Lambda Function with some triggers (eg, Cloudwatch Events, EventBridge).
Code Signing - Create Lambda Function with code signing configuration.
Simple CI/CD - Create Lambda Function as if it runs on CI/CD platform where builds directory is often absent.

Examples by the users of this module

1Mill/serverless-tf-examples

Requirements

Name	Version
terraform	>= 1.0
aws	>= 5.70
external	>= 1.0
local	>= 1.0
null	>= 2.0

Providers

Name	Version
aws	>= 5.70
external	>= 1.0
local	>= 1.0
null	>= 2.0

Modules

No modules.

Resources

Name	Type
aws_cloudwatch_log_group.lambda	resource
aws_iam_policy.additional_inline	resource
aws_iam_policy.additional_json	resource
aws_iam_policy.additional_jsons	resource
aws_iam_policy.async	resource
aws_iam_policy.dead_letter	resource
aws_iam_policy.logs	resource
aws_iam_policy.tracing	resource
aws_iam_policy.vpc	resource
aws_iam_role.lambda	resource
aws_iam_role_policy_attachment.additional_inline	resource
aws_iam_role_policy_attachment.additional_json	resource
aws_iam_role_policy_attachment.additional_jsons	resource
aws_iam_role_policy_attachment.additional_many	resource
aws_iam_role_policy_attachment.additional_one	resource
aws_iam_role_policy_attachment.async	resource
aws_iam_role_policy_attachment.dead_letter	resource
aws_iam_role_policy_attachment.logs	resource
aws_iam_role_policy_attachment.tracing	resource
aws_iam_role_policy_attachment.vpc	resource
aws_lambda_event_source_mapping.this	resource
aws_lambda_function.this	resource
aws_lambda_function_event_invoke_config.this	resource
aws_lambda_function_url.this	resource
aws_lambda_layer_version.this	resource
aws_lambda_permission.current_version_triggers	resource
aws_lambda_permission.unqualified_alias_triggers	resource
aws_lambda_provisioned_concurrency_config.current_version	resource
aws_s3_object.lambda_package	resource
local_file.archive_plan	resource
null_resource.archive	resource
null_resource.sam_metadata_aws_lambda_function	resource
null_resource.sam_metadata_aws_lambda_layer_version	resource
aws_arn.log_group_arn	data source
aws_caller_identity.current	data source
aws_cloudwatch_log_group.lambda	data source
aws_iam_policy.tracing	data source
aws_iam_policy.vpc	data source
aws_iam_policy_document.additional_inline	data source
aws_iam_policy_document.assume_role	data source
aws_iam_policy_document.async	data source
aws_iam_policy_document.dead_letter	data source
aws_iam_policy_document.logs	data source
aws_partition.current	data source
aws_region.current	data source
external_external.archive_prepare	data source

Inputs

Name	Description	Type	Default	Required
allowed_triggers	Map of allowed triggers to create Lambda permissions	`map(any)`	`{}`	no
architectures	Instruction set architecture for your Lambda function. Valid values are ["x86_64"] and ["arm64"].	`list(string)`	`null`	no
artifacts_dir	Directory name where artifacts should be stored	`string`	`"builds"`	no
assume_role_policy_statements	Map of dynamic policy statements for assuming Lambda Function role (trust relationship)	`any`	`{}`	no
attach_async_event_policy	Controls whether async event policy should be added to IAM role for Lambda Function	`bool`	`false`	no
attach_cloudwatch_logs_policy	Controls whether CloudWatch Logs policy should be added to IAM role for Lambda Function	`bool`	`true`	no
attach_create_log_group_permission	Controls whether to add the create log group permission to the CloudWatch logs policy	`bool`	`true`	no
attach_dead_letter_policy	Controls whether SNS/SQS dead letter notification policy should be added to IAM role for Lambda Function	`bool`	`false`	no
attach_network_policy	Controls whether VPC/network policy should be added to IAM role for Lambda Function	`bool`	`false`	no
attach_policies	Controls whether list of policies should be added to IAM role for Lambda Function	`bool`	`false`	no
attach_policy	Controls whether policy should be added to IAM role for Lambda Function	`bool`	`false`	no
attach_policy_json	Controls whether policy_json should be added to IAM role for Lambda Function	`bool`	`false`	no
attach_policy_jsons	Controls whether policy_jsons should be added to IAM role for Lambda Function	`bool`	`false`	no
attach_policy_statements	Controls whether policy_statements should be added to IAM role for Lambda Function	`bool`	`false`	no
attach_tracing_policy	Controls whether X-Ray tracing policy should be added to IAM role for Lambda Function	`bool`	`false`	no
authorization_type	The type of authentication that the Lambda Function URL uses. Set to 'AWS_IAM' to restrict access to authenticated IAM users only. Set to 'NONE' to bypass IAM authentication and create a public endpoint.	`string`	`"NONE"`	no
build_in_docker	Whether to build dependencies in Docker	`bool`	`false`	no
cloudwatch_logs_kms_key_id	The ARN of the KMS Key to use when encrypting log data.	`string`	`null`	no
cloudwatch_logs_log_group_class	Specified the log class of the log group. Possible values are: `STANDARD` or `INFREQUENT_ACCESS`	`string`	`null`	no
cloudwatch_logs_retention_in_days	Specifies the number of days you want to retain log events in the specified log group. Possible values are: 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, and 3653.	`number`	`null`	no
cloudwatch_logs_skip_destroy	Whether to keep the log group (and any logs it may contain) at destroy time.	`bool`	`false`	no
cloudwatch_logs_tags	A map of tags to assign to the resource.	`map(string)`	`{}`	no
code_signing_config_arn	Amazon Resource Name (ARN) for a Code Signing Configuration	`string`	`null`	no
compatible_architectures	A list of Architectures Lambda layer is compatible with. Currently x86_64 and arm64 can be specified.	`list(string)`	`null`	no
compatible_runtimes	A list of Runtimes this layer is compatible with. Up to 5 runtimes can be specified.	`list(string)`	`[]`	no
cors	CORS settings to be used by the Lambda Function URL	`any`	`{}`	no
create	Controls whether resources should be created	`bool`	`true`	no
create_async_event_config	Controls whether async event configuration for Lambda Function/Alias should be created	`bool`	`false`	no
create_current_version_allowed_triggers	Whether to allow triggers on current version of Lambda Function (this will revoke permissions from previous version because Terraform manages only current resources)	`bool`	`true`	no
create_current_version_async_event_config	Whether to allow async event configuration on current version of Lambda Function (this will revoke permissions from previous version because Terraform manages only current resources)	`bool`	`true`	no
create_function	Controls whether Lambda Function resource should be created	`bool`	`true`	no
create_lambda_function_url	Controls whether the Lambda Function URL resource should be created	`bool`	`false`	no
create_layer	Controls whether Lambda Layer resource should be created	`bool`	`false`	no
create_package	Controls whether Lambda package should be created	`bool`	`true`	no
create_role	Controls whether IAM role for Lambda Function should be created	`bool`	`true`	no
create_sam_metadata	Controls whether the SAM metadata null resource should be created	`bool`	`false`	no
create_unqualified_alias_allowed_triggers	Whether to allow triggers on unqualified alias pointing to $LATEST version	`bool`	`true`	no
create_unqualified_alias_async_event_config	Whether to allow async event configuration on unqualified alias pointing to $LATEST version	`bool`	`true`	no
create_unqualified_alias_lambda_function_url	Whether to use unqualified alias pointing to $LATEST version in Lambda Function URL	`bool`	`true`	no
dead_letter_target_arn	The ARN of an SNS topic or SQS queue to notify when an invocation fails.	`string`	`null`	no
description	Description of your Lambda Function (or Layer)	`string`	`""`	no
destination_on_failure	Amazon Resource Name (ARN) of the destination resource for failed asynchronous invocations	`string`	`null`	no
destination_on_success	Amazon Resource Name (ARN) of the destination resource for successful asynchronous invocations	`string`	`null`	no
docker_additional_options	Additional options to pass to the docker run command (e.g. to set environment variables, volumes, etc.)	`list(string)`	`[]`	no
docker_build_root	Root dir where to build in Docker	`string`	`""`	no
docker_entrypoint	Path to the Docker entrypoint to use	`string`	`null`	no
docker_file	Path to a Dockerfile when building in Docker	`string`	`""`	no
docker_image	Docker image to use for the build	`string`	`""`	no
docker_pip_cache	Whether to mount a shared pip cache folder into docker environment or not	`any`	`null`	no
docker_with_ssh_agent	Whether to pass SSH_AUTH_SOCK into docker environment or not	`bool`	`false`	no
environment_variables	A map that defines environment variables for the Lambda Function.	`map(string)`	`{}`	no
ephemeral_storage_size	Amount of ephemeral storage (/tmp) in MB your Lambda Function can use at runtime. Valid value between 512 MB to 10,240 MB (10 GB).	`number`	`512`	no
event_source_mapping	Map of event source mapping	`any`	`{}`	no
file_system_arn	The Amazon Resource Name (ARN) of the Amazon EFS Access Point that provides access to the file system.	`string`	`null`	no
file_system_local_mount_path	The path where the function can access the file system, starting with /mnt/.	`string`	`null`	no
function_name	A unique name for your Lambda Function	`string`	`""`	no
function_tags	A map of tags to assign only to the lambda function	`map(string)`	`{}`	no
handler	Lambda Function entrypoint in your code	`string`	`""`	no
hash_extra	The string to add into hashing function. Useful when building same source path for different functions.	`string`	`""`	no
ignore_source_code_hash	Whether to ignore changes to the function's source code hash. Set to true if you manage infrastructure and code deployments separately.	`bool`	`false`	no
image_config_command	The CMD for the docker image	`list(string)`	`[]`	no
image_config_entry_point	The ENTRYPOINT for the docker image	`list(string)`	`[]`	no
image_config_working_directory	The working directory for the docker image	`string`	`null`	no
image_uri	The ECR image URI containing the function's deployment package.	`string`	`null`	no
invoke_mode	Invoke mode of the Lambda Function URL. Valid values are BUFFERED (default) and RESPONSE_STREAM.	`string`	`null`	no
ipv6_allowed_for_dual_stack	Allows outbound IPv6 traffic on VPC functions that are connected to dual-stack subnets	`bool`	`null`	no
kms_key_arn	The ARN of KMS key to use by your Lambda Function	`string`	`null`	no
lambda_at_edge	Set this to true if using Lambda@Edge, to enable publishing, limit the timeout, and allow edgelambda.amazonaws.com to invoke the function	`bool`	`false`	no
lambda_at_edge_logs_all_regions	Whether to specify a wildcard in IAM policy used by Lambda@Edge to allow logging in all regions	`bool`	`true`	no
lambda_role	IAM role ARN attached to the Lambda Function. This governs both who / what can invoke your Lambda Function, as well as what resources our Lambda Function has access to. See Lambda Permission Model for more details.	`string`	`""`	no
layer_name	Name of Lambda Layer to create	`string`	`""`	no
layer_skip_destroy	Whether to retain the old version of a previously deployed Lambda Layer.	`bool`	`false`	no
layers	List of Lambda Layer Version ARNs (maximum of 5) to attach to your Lambda Function.	`list(string)`	`null`	no
license_info	License info for your Lambda Layer. Eg, MIT or full url of a license.	`string`	`""`	no
local_existing_package	The absolute path to an existing zip-file to use	`string`	`null`	no
logging_application_log_level	The application log level of the Lambda Function. Valid values are "TRACE", "DEBUG", "INFO", "WARN", "ERROR", or "FATAL".	`string`	`"INFO"`	no
logging_log_format	The log format of the Lambda Function. Valid values are "JSON" or "Text".	`string`	`"Text"`	no
logging_log_group	The CloudWatch log group to send logs to.	`string`	`null`	no
logging_system_log_level	The system log level of the Lambda Function. Valid values are "DEBUG", "INFO", or "WARN".	`string`	`"INFO"`	no
maximum_event_age_in_seconds	Maximum age of a request that Lambda sends to a function for processing in seconds. Valid values between 60 and 21600.	`number`	`null`	no
maximum_retry_attempts	Maximum number of times to retry when the function returns an error. Valid values between 0 and 2. Defaults to 2.	`number`	`null`	no
memory_size	Amount of memory in MB your Lambda Function can use at runtime. Valid value between 128 MB to 10,240 MB (10 GB), in 64 MB increments.	`number`	`128`	no
number_of_policies	Number of policies to attach to IAM role for Lambda Function	`number`	`0`	no
number_of_policy_jsons	Number of policies JSON to attach to IAM role for Lambda Function	`number`	`0`	no
package_type	The Lambda deployment package type. Valid options: Zip or Image	`string`	`"Zip"`	no
policies	List of policy statements ARN to attach to Lambda Function role	`list(string)`	`[]`	no
policy	An additional policy document ARN to attach to the Lambda Function role	`string`	`null`	no
policy_json	An additional policy document as JSON to attach to the Lambda Function role	`string`	`null`	no
policy_jsons	List of additional policy documents as JSON to attach to Lambda Function role	`list(string)`	`[]`	no
policy_name	IAM policy name. It override the default value, which is the same as role_name	`string`	`null`	no
policy_path	Path of policies to that should be added to IAM role for Lambda Function	`string`	`null`	no
policy_statements	Map of dynamic policy statements to attach to Lambda Function role	`any`	`{}`	no
provisioned_concurrent_executions	Amount of capacity to allocate. Set to 1 or greater to enable, or set to 0 to disable provisioned concurrency.	`number`	`-1`	no
publish	Whether to publish creation/change as new Lambda Function Version.	`bool`	`false`	no
putin_khuylo	Do you agree that Putin doesn't respect Ukrainian sovereignty and territorial integrity? More info: https://en.wikipedia.org/wiki/Putin_khuylo!	`bool`	`true`	no
recreate_missing_package	Whether to recreate missing Lambda package if it is missing locally or not	`bool`	`true`	no
replace_security_groups_on_destroy	(Optional) When true, all security groups defined in vpc_security_group_ids will be replaced with the default security group after the function is destroyed. Set the replacement_security_group_ids variable to use a custom list of security groups for replacement instead.	`bool`	`null`	no
replacement_security_group_ids	(Optional) List of security group IDs to assign to orphaned Lambda function network interfaces upon destruction. replace_security_groups_on_destroy must be set to true to use this attribute.	`list(string)`	`null`	no
reserved_concurrent_executions	The amount of reserved concurrent executions for this Lambda Function. A value of 0 disables Lambda Function from being triggered and -1 removes any concurrency limitations. Defaults to Unreserved Concurrency Limits -1.	`number`	`-1`	no
role_description	Description of IAM role to use for Lambda Function	`string`	`null`	no
role_force_detach_policies	Specifies to force detaching any policies the IAM role has before destroying it.	`bool`	`true`	no
role_maximum_session_duration	Maximum session duration, in seconds, for the IAM role	`number`	`3600`	no
role_name	Name of IAM role to use for Lambda Function	`string`	`null`	no
role_path	Path of IAM role to use for Lambda Function	`string`	`null`	no
role_permissions_boundary	The ARN of the policy that is used to set the permissions boundary for the IAM role used by Lambda Function	`string`	`null`	no
role_tags	A map of tags to assign to IAM role	`map(string)`	`{}`	no
runtime	Lambda Function runtime	`string`	`""`	no
s3_acl	The canned ACL to apply. Valid values are private, public-read, public-read-write, aws-exec-read, authenticated-read, bucket-owner-read, and bucket-owner-full-control. Defaults to private.	`string`	`"private"`	no
s3_bucket	S3 bucket to store artifacts	`string`	`null`	no
s3_existing_package	The S3 bucket object with keys bucket, key, version pointing to an existing zip-file to use	`map(string)`	`null`	no
s3_kms_key_id	Specifies a custom KMS key to use for S3 object encryption.	`string`	`null`	no
s3_object_override_default_tags	Whether to override the default_tags from provider? NB: S3 objects support a maximum of 10 tags.	`bool`	`false`	no
s3_object_storage_class	Specifies the desired Storage Class for the artifact uploaded to S3. Can be either STANDARD, REDUCED_REDUNDANCY, ONEZONE_IA, INTELLIGENT_TIERING, or STANDARD_IA.	`string`	`"ONEZONE_IA"`	no
s3_object_tags	A map of tags to assign to S3 bucket object.	`map(string)`	`{}`	no
s3_object_tags_only	Set to true to not merge tags with s3_object_tags. Useful to avoid breaching S3 Object 10 tag limit.	`bool`	`false`	no
s3_prefix	Directory name where artifacts should be stored in the S3 bucket. If unset, the path from `artifacts_dir` is used	`string`	`null`	no
s3_server_side_encryption	Specifies server-side encryption of the object in S3. Valid values are "AES256" and "aws:kms".	`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. Useful for Lambda@Edge functions attached to CloudFront distributions.	`bool`	`null`	no
snap_start	(Optional) Snap start settings for low-latency startups	`bool`	`false`	no
source_path	The absolute path to a local file or directory containing your Lambda source code	`any`	`null`	no
store_on_s3	Whether to store produced artifacts on S3 or locally.	`bool`	`false`	no
tags	A map of tags to assign to resources.	`map(string)`	`{}`	no
timeout	The amount of time your Lambda Function has to run in seconds.	`number`	`3`	no
timeouts	Define maximum timeout for creating, updating, and deleting Lambda Function resources	`map(string)`	`{}`	no
tracing_mode	Tracing mode of the Lambda Function. Valid value can be either PassThrough or Active.	`string`	`null`	no
trigger_on_package_timestamp	Whether to recreate the Lambda package if the timestamp changes	`bool`	`true`	no
trusted_entities	List of additional trusted entities for assuming Lambda Function role (trust relationship)	`any`	`[]`	no
use_existing_cloudwatch_log_group	Whether to use an existing CloudWatch log group or create new	`bool`	`false`	no
vpc_security_group_ids	List of security group ids when Lambda Function should run in the VPC.	`list(string)`	`null`	no
vpc_subnet_ids	List of subnet ids when Lambda Function should run in the VPC. Usually private or intra subnets.	`list(string)`	`null`	no

Outputs

Name	Description
lambda_cloudwatch_log_group_arn	The ARN of the Cloudwatch Log Group
lambda_cloudwatch_log_group_name	The name of the Cloudwatch Log Group
lambda_event_source_mapping_arn	The event source mapping ARN
lambda_event_source_mapping_function_arn	The the ARN of the Lambda function the event source mapping is sending events to
lambda_event_source_mapping_state	The state of the event source mapping
lambda_event_source_mapping_state_transition_reason	The reason the event source mapping is in its current state
lambda_event_source_mapping_uuid	The UUID of the created event source mapping
lambda_function_arn	The ARN of the Lambda Function
lambda_function_arn_static	The static ARN of the Lambda Function. Use this to avoid cycle errors between resources (e.g., Step Functions)
lambda_function_invoke_arn	The Invoke ARN of the Lambda Function
lambda_function_kms_key_arn	The ARN for the KMS encryption key of Lambda Function
lambda_function_last_modified	The date Lambda Function resource was last modified
lambda_function_name	The name of the Lambda Function
lambda_function_qualified_arn	The ARN identifying your Lambda Function Version
lambda_function_qualified_invoke_arn	The Invoke ARN identifying your Lambda Function Version
lambda_function_signing_job_arn	ARN of the signing job
lambda_function_signing_profile_version_arn	ARN of the signing profile version
lambda_function_source_code_hash	Base64-encoded representation of raw SHA-256 sum of the zip file
lambda_function_source_code_size	The size in bytes of the function .zip file
lambda_function_url	The URL of the Lambda Function URL
lambda_function_url_id	The Lambda Function URL generated id
lambda_function_version	Latest published version of Lambda Function
lambda_layer_arn	The ARN of the Lambda Layer with version
lambda_layer_created_date	The date Lambda Layer resource was created
lambda_layer_layer_arn	The ARN of the Lambda Layer without version
lambda_layer_source_code_size	The size in bytes of the Lambda Layer .zip file
lambda_layer_version	The Lambda Layer version
lambda_role_arn	The ARN of the IAM role created for the Lambda Function
lambda_role_name	The name of the IAM role created for the Lambda Function
lambda_role_unique_id	The unique id of the IAM role created for the Lambda Function
local_filename	The filename of zip archive deployed (if deployment was from local)
s3_object	The map with S3 object data of zip archive deployed (if deployment was from S3)

Development

Python

During development involving modifying python files, use tox to run unit tests:

tox

This will try to run unit tests which each supported python version, reporting errors for python versions which are not installed locally.

If you only want to test against your main python version:

tox -e py

You can also pass additional positional arguments to pytest which is used to run test, e.g. to make it verbose:

tox -e py -- -vvv

Authors

Module managed by Anton Babenko. Check out serverless.tf to learn more about doing serverless with Terraform.

Please reach out to Betajob if you are looking for commercial support for your Terraform, AWS, or serverless project.

License

Apache 2 Licensed. See LICENSE for full details.

Additional information for users from Russia and Belarus

Russia has illegally annexed Crimea in 2014 and brought the war in Donbas followed by full-scale invasion of Ukraine in 2022.
Russia has brought sorrow and devastations to millions of Ukrainians, killed hundreds of innocent people, damaged thousands of buildings, and forced several million people to flee.
Putin khuylo!

Name		Name	Last commit message	Last commit date
Latest commit History 435 Commits
.github/workflows		.github/workflows
examples		examples
modules		modules
tests		tests
wrappers		wrappers
.editorconfig		.editorconfig
.gitignore		.gitignore
.pre-commit-config.yaml		.pre-commit-config.yaml
.releaserc.json		.releaserc.json
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
README.md		README.md
iam.tf		iam.tf
main.tf		main.tf
outputs.tf		outputs.tf
package.py		package.py
package.tf		package.tf
tox.ini		tox.ini
variables.tf		variables.tf
versions.tf		versions.tf

License

binbashar/terraform-aws-lambda

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AWS Lambda Terraform module

Features

Usage

Lambda Function (store package locally)

Lambda Function and Lambda Layer (store packages on S3)

Lambda Functions with existing package (prebuilt) stored locally

Lambda Function or Lambda Layer with the deployable artifact maintained separately from the infrastructure

Lambda Function with existing package (prebuilt) stored in S3 bucket

Lambda Functions from Container Image stored on AWS ECR

Lambda Layers (store packages locally and on S3)

Lambda@Edge

Lambda Function in VPC

Additional IAM policies for Lambda Functions

Lambda Permissions for allowed triggers

Conditional creation

How does building and packaging work?

Debug

Build Dependencies

Simple build from single directory

Static build from multiple source directories

Combine various options for extreme flexibility

Building in Docker

Passing additional Docker options

Overriding Docker Entrypoint

Deployment package - Create or use existing

Using deployment package from remote URL

How to use AWS SAM CLI to test Lambda Function?

Local Testing

Testing on-cloud (Accelerate)

How to deploy and manage Lambda Functions?

Simple deployments

Controlled deployments (rolling, canary, rollbacks)

Terraform CI/CD

FAQ

Notes

Examples

Examples by the users of this module

Requirements

Providers

Modules

Resources

Inputs

Outputs

Development

Python

Authors

License

Additional information for users from Russia and Belarus

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