README.md

This component is responsible for provisioning Lambda functions.

Tip

👽 Use Atmos with Terraform

Cloud Posse uses atmos to easily orchestrate multiple environments using Terraform.
Works with Github Actions, Atlantis, or Spacelift.

Watch demo of using Atmos with Terraform

Example of running atmos to manage infrastructure from our Quick Start tutorial.

Usage

Stack Level: Regional

Stack configuration for defaults:

components:
  terraform:
    lambda-defaults:
      metadata:
        type: abstract
      settings:
        spacelift:
          workspace_enabled: true
      vars:
        enabled: true

Sample App Yaml Entry:

import:
  - catalog/lambda/defaults

components:
  terraform:
    lambda/hello-world-py:
      metadata:
        component: lambda
        inherits:
          - lambda/defaults
      vars:
        name: hello-world-py
        function_name: main
        description: Hello Lambda from Python!
        handler: lambda.lambda_handler # in go this is the compiled binary, python it's filename.function
        memory_size: 256
        # https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html
        runtime: python3.9
        package_type: Zip # `Zip` or `Image`
        policy_json: |
          {
            "Version": "2012-10-17",
            "Statement": [
              {
                "Sid": "ListAllBuckets",
                "Effect": "Allow",
                "Action": "s3:ListAllMyBuckets",
                "Resource": "*"
              }
            ]
          }
        iam_policy:
          statements:
            - sid: AllowSQSWorkerWriteAccess
              effect: Allow
              actions:
                - sqs:SendMessage
                - sqs:SendMessageBatch
              resources:
                - arn:aws:sqs:*:111111111111:worker-queue
        # Filename example
        filename: lambdas/hello-world-python/output.zip # generated by zip variable.
        zip:
          enabled: true
          input_dir: hello-world-python
          output: hello-world-python/output.zip

        # S3 Source Example
        # s3_bucket_name: lambda-source # lambda main.tf calculates the rest of the bucket_name
        # s3_key: hello-world-go.zip

Notifications:

SQS

sqs_notifications:
  my-service-a:
    sqs_component:
      component: sqs-queue/my-service-a
  my-service-b:
    sqs_arn: arn:aws:sqs:us-west-2:111111111111:my-service-b

S3

s3_notifications:
  my-service-a:
    bucket_component:
      component: s3-bucket/my-service-a
    events: ["s3:ObjectCreated:*"]
  my-service-b:
    bucket_name: my-service-b
    events: ["s3:ObjectCreated:*", "s3:ObjectRemoved:*"]

Cron (CloudWatch Event)

cloudwatch_event_rules:
  schedule-a:
    schedule_expression: "rate(5 minutes)"
  schedule-b:
    schedule_expression: "cron(0 20 * * ? *)"

Requirements

Providers

Modules

Resources

Inputs

map(object({
    description         = optional(string)
    event_bus_name      = optional(string)
    event_pattern       = optional(string)
    is_enabled          = optional(bool)
    name_prefix         = optional(string)
    role_arn            = optional(string)
    schedule_expression = optional(string)
  }))

{
  "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
}

list(object({
    policy_id = optional(string, null)
    version   = optional(string, null)
    statements = list(object({
      sid           = optional(string, null)
      effect        = optional(string, null)
      actions       = optional(list(string), null)
      not_actions   = optional(list(string), null)
      resources     = optional(list(string), null)
      not_resources = optional(list(string), null)
      conditions = optional(list(object({
        test     = string
        variable = string
        values   = list(string)
      })), [])
      principals = optional(list(object({
        type        = string
        identifiers = list(string)
      })), [])
      not_principals = optional(list(object({
        type        = string
        identifiers = list(string)
      })), [])
    }))
  }))

[
  "default"
]

object({
    variables = map(string)
  })

object({
    component   = string
    tenant      = optional(string)
    stage       = optional(string)
    environment = optional(string)
  })

map(object({
    bucket_name = optional(string)
    bucket_component = optional(object({
      component   = string
      environment = optional(string)
      tenant      = optional(string)
      stage       = optional(string)
    }))
    events         = optional(list(string))
    filter_prefix  = optional(string)
    filter_suffix  = optional(string)
    source_account = optional(string)
  }))

map(object({
    sqs_arn = optional(string)
    sqs_component = optional(object({
      component   = string
      environment = optional(string)
      tenant      = optional(string)
      stage       = optional(string)
    }))
    batch_size          = optional(number)
    source_account      = optional(string)
    on_failure_arn      = optional(string)
    maximum_concurrency = optional(number)
  }))

object({
    security_group_ids = list(string)
    subnet_ids         = list(string)
  })

object({
    enabled   = optional(bool, false)
    output    = optional(string, "output.zip")
    input_dir = optional(string, null)
  })

{
  "enabled": false,
  "output": "output.zip"
}

Outputs

Related Projects

Check out these related projects.

• Cloud Posse Terraform Modules - Our collection of reusable Terraform modules used by our reference architectures.
• Atmos - Atmos is like docker-compose but for your infrastructure

References

For additional context, refer to some of these links.

• cloudposse-terraform-components - Cloud Posse's upstream component

✨ Contributing

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

For 🐛 bug reports & feature requests, please use the issue tracker.

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

1. Review our Code of Conduct and Contributor Guidelines.
2. Fork the repo on GitHub
3. Clone the project to your own machine
4. Commit changes to your own branch
5. Push your work back up to your fork
6. Submit a Pull Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

Running Terraform Tests

We use Atmos to streamline how Terraform tests are run. It centralizes configuration and wraps common test workflows with easy-to-use commands.

All tests are located in the test/ folder.

Under the hood, tests are powered by Terratest together with our internal Test Helpers library, providing robust infrastructure validation.

Setup dependencies:

• Install Atmos (installation guide)
• Install Go 1.24+ or newer
• Install Terraform or OpenTofu

To run tests:

• Run all tests:

  atmos test run
  

• Clean up test artifacts:

  atmos test clean
  

• Explore additional test options:

  atmos test --help
  

The configuration for test commands is centrally managed. To review what's being imported, see the atmos.yaml file.

Learn more about our automated testing in our documentation or implementing custom commands with atmos.

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License

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

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.

Trademarks

All other trademarks referenced herein are the property of their respective owners.

Copyright © 2017-2026 Cloud Posse, LLC