davenicoll/github-action-atmos-terraform-plan

This Github Action is used to run Terraform plan for a single, Atmos-supported component and save the given planfile to S3 and DynamoDB.

Tip

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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.

Introduction

This Github Action is used to run Terraform plan for a single, Atmos-supported component and save the given planfile to S3 and DynamoDB.

After running this action, apply Terraform with the companion action, github-action-atmos-terraform-apply

Usage

Prerequisites

This GitHub Action requires AWS access for two different purposes. This action will attempt to first run terraform plan against a given component and then will use another role to save that given Terraform Plan to an S3 Bucket with metadata in a DynamoDB table. We recommend configuring OpenID Connect with AWS to allow GitHub to assume roles in AWS and then deploying both a Terraform Plan role and a Terraform State role. For Cloud Posse documentation on setting up GitHub OIDC, see our github-oidc-provider component.

In order to store Terraform State, we configure an S3 Bucket to store plan files and a DynamoDB table to track plan metadata. Both will need to be deployed before running this action. For more on setting up those components, see the gitops component (documentation pending). This action will then use the github-action-terraform-plan-storage action to update these resources.

Config

The action expects the atmos configuration file atmos.yaml to be present in the repository. The config should have the following structure:

integrations:
  github:
    gitops:
      terraform-version: 1.5.2
      infracost-enabled: false
      artifact-storage:
        region: us-east-2
        bucket: cptest-core-ue2-auto-gitops
        table: cptest-core-ue2-auto-gitops-plan-storage
        role: arn:aws:iam::xxxxxxxxxxxx:role/cptest-core-ue2-auto-gitops-gha
      role:
        plan: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
        apply: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
      matrix:
        sort-by: .stack_slug
        group-by: .stack_slug | split("-") | [.[0], .[2]] | join("-")

Important

Please note! This GitHub Action only works with atmos >= 1.63.0. If you are using atmos < 1.63.0 please use v1 version of this action.

Workflow example

  name: "atmos-terraform-plan"

  on:
    workflow_dispatch: {}
    pull_request:
      types:
        - opened
        - synchronize
        - reopened
      branches:
        - main

  # These permissions are required for GitHub to assume roles in AWS
  permissions:
    id-token: write
    contents: read

  jobs:
    plan:
      runs-on: ubuntu-latest
      steps:
        - name: Plan Atmos Component
          uses: cloudposse/github-action-atmos-terraform-plan@v2
          with:
            component: "foobar"
            stack: "plat-ue2-sandbox"
            atmos-config-path: ./rootfs/usr/local/etc/atmos/
            atmos-version: 1.63.0

Migrating from `v1` to `v2`

The notable changes in v2 are:

v2 works only with atmos >= 1.63.0
v2 drops install-terraform input because terraform is not required for affected stacks call
v2 drops atmos-gitops-config-path input and the ./.github/config/atmos-gitops.yaml config file. Now you have to use GitHub Actions environment variables to specify the location of the atmos.yaml.

The following configuration fields now moved to GitHub action inputs with the same names

name
`atmos-version`
`atmos-config-path`

The following configuration fields moved to the atmos.yaml configuration file.

name	YAML path in `atmos.yaml`
`aws-region`	`integrations.github.gitops.artifact-storage.region`
`terraform-state-bucket`	`integrations.github.gitops.artifact-storage.bucket`
`terraform-state-table`	`integrations.github.gitops.artifact-storage.table`
`terraform-state-role`	`integrations.github.gitops.artifact-storage.role`
`terraform-plan-role`	`integrations.github.gitops.role.plan`
`terraform-apply-role`	`integrations.github.gitops.role.apply`
`terraform-version`	`integrations.github.gitops.terraform-version`
`enable-infracost`	`integrations.github.gitops.infracost-enabled`
`sort-by`	`integrations.github.gitops.matrix.sort-by`
`group-by`	`integrations.github.gitops.matrix.group-by`

For example, to migrate from v1 to v2, you should have something similar to the following in your atmos.yaml:

./.github/config/atmos.yaml

# ... your existing configuration

integrations:
  github:
    gitops:
      terraform-version: 1.5.2
      infracost-enabled: false
      artifact-storage:
        region: us-east-2
        bucket: cptest-core-ue2-auto-gitops
        table: cptest-core-ue2-auto-gitops-plan-storage
        role: arn:aws:iam::xxxxxxxxxxxx:role/cptest-core-ue2-auto-gitops-gha
      role:
        plan: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
        apply: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
      matrix:
        sort-by: .stack_slug
        group-by: .stack_slug | split("-") | [.[0], .[2]] | join("-")

.github/workflows/main.yaml

  - name: Plan Atmos Component
    uses: cloudposse/github-action-atmos-terraform-plan@v2
    with:
      component: "foobar"
      stack: "plat-ue2-sandbox"
      atmos-config-path: ./rootfs/usr/local/etc/atmos/
      atmos-version: 1.63.0

This corresponds to the v1 configuration (deprecated) below.

The v1 configuration file ./.github/config/atmos-gitops.yaml looked like this:

atmos-version: 1.45.3
atmos-config-path: ./rootfs/usr/local/etc/atmos/
terraform-state-bucket: cptest-core-ue2-auto-gitops
terraform-state-table: cptest-core-ue2-auto-gitops
terraform-state-role: arn:aws:iam::xxxxxxxxxxxx:role/cptest-core-ue2-auto-gitops-gha
terraform-plan-role: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
terraform-apply-role: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
terraform-version: 1.5.2
aws-region: us-east-2
enable-infracost: false
sort-by: .stack_slug
group-by: .stack_slug | split("-") | [.[0], .[2]] | join("-")

And the v1 GitHub Action Workflow looked like this.

.github/workflows/main.yaml

  - name: Plan Atmos Component
    uses: cloudposse/github-action-atmos-terraform-plan@v1
    with:
      component: "foobar"
      stack: "plat-ue2-sandbox"
      atmos-gitops-config-path: ./.github/config/atmos-gitops.yaml

Migrating from `v1` to `v2`

v2 drops the component-path variable and instead fetches if directly from the atmos.yaml file automatically. Simply remove the component-path argument from your invocations of the cloudposse/github-action-atmos-terraform-plan action.
v2 moves most of the inputs to the Atmos GitOps config path ./.github/config/atmos-gitops.yaml. Simply create this file, transfer your settings to it, then remove the corresponding arguments from your invocations of the cloudposse/github-action-atmos-terraform-plan action. | name | |--------------------------| | atmos-version | | atmos-config-path | | terraform-state-bucket | | terraform-state-table | | terraform-state-role | | terraform-plan-role | | terraform-apply-role | | terraform-version | | aws-region | | enable-infracost |

If you want the same behavior in v2 as in v1 you should create config ./.github/config/atmos-gitops.yaml with the same variables as in v1 inputs.

  - name: Plan Atmos Component
    uses: cloudposse/github-action-atmos-terraform-plan@v1
    with:
      component: "foobar"
      stack: "plat-ue2-sandbox"
      atmos-gitops-config-path: ./.github/config/atmos-gitops.yaml

Which would produce the same behavior as in v1, doing this:

  - name: Plan Atmos Component
    uses: cloudposse/github-action-atmos-terraform-plan@v1
    with:
      component: "foobar"
      stack: "plat-ue2-sandbox"
      component-path: "components/terraform/s3-bucket"
      terraform-plan-role: "arn:aws:iam::111111111111:role/acme-core-gbl-identity-gitops"
      terraform-state-bucket: "acme-core-ue2-auto-gitops"
      terraform-state-role: "arn:aws:iam::999999999999:role/acme-core-ue2-auto-gitops-gha"
      terraform-state-table: "acme-core-ue2-auto-gitops"
      aws-region: "us-east-2"

Important

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

Inputs

Name	Description	Default	Required
atmos-config-path	The path to the atmos.yaml file	N/A	true
atmos-version	The version of atmos to install	>= 1.63.0	false
branding-logo-image	Branding logo image url	https://cloudposse.com/logo-300x69.svg	false
branding-logo-url	Branding logo url	https://cloudposse.com/	false
component	The name of the component to plan.	N/A	true
debug	Enable action debug mode. Default: 'false'	false	false
drift-detection-mode-enabled	Indicate whether this action is used in drift detection workflow.	false	true
infracost-api-key	Infracost API key	N/A	false
metadata-retention-days	Infracost API key	1	false
sha	Commit SHA to plan. Default: github.sha	${{ github.event.pull_request.head.sha }}	true
stack	The stack name for the given component.	N/A	true
token	Used to pull node distributions for Atmos from Cloud Posse's GitHub repository. Since there's a default, this is typically not supplied by the user. When running this action on github.com, the default value is sufficient. When running on GHES, you can pass a personal access token for github.com if you are experiencing rate limiting.	${{ github.server_url == 'https://github.com' && github.token \|\| '' }}	false

Outputs

Name	Description
summary	Summary

Related Projects

Check out these related projects.

References

For additional context, refer to some of these links.

github-action-atmos-terraform-apply - Companion GitHub Action to apply Terraform for a given component
github-action-terraform-plan-storage - GitHub Action to store Terraform plans

Tip

Use Terraform Reference Architectures for AWS

Use Cloud Posse's ready-to-go terraform architecture blueprints for AWS to get up and running quickly.

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✅ Your team owns everything.
✅ 100% Open Source and backed by fanatical support.

📚 Learn More

Cloud Posse is the leading DevOps Accelerator for funded startups and enterprises.

Your team can operate like a pro today.

Ensure that your team succeeds by using Cloud Posse's proven process and turnkey blueprints. Plus, we stick around until you succeed.

Day-0: Your Foundation for Success

Reference Architecture. You'll get everything you need from the ground up built using 100% infrastructure as code.
Deployment Strategy. Adopt a proven deployment strategy with GitHub Actions, enabling automated, repeatable, and reliable software releases.
Site Reliability Engineering. Gain total visibility into your applications and services with Datadog, ensuring high availability and performance.
Security Baseline. Establish a secure environment from the start, with built-in governance, accountability, and comprehensive audit logs, safeguarding your operations.
GitOps. Empower your team to manage infrastructure changes confidently and efficiently through Pull Requests, leveraging the full power of GitHub Actions.

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Training. Equip your team with the knowledge and skills to confidently manage the infrastructure, ensuring long-term success and self-sufficiency.
Support. Benefit from a seamless communication over Slack with our experts, ensuring you have the support you need, whenever you need it.
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Bug Fixes. Rely on our team to troubleshoot and resolve any issues, ensuring your systems run smoothly.
Migration Assistance. Accelerate your migration process with our dedicated support, minimizing disruption and speeding up time-to-value.
Customer Workshops. Engage with our team in weekly workshops, gaining insights and strategies to continuously improve and innovate.

✨ 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.

Review our Code of Conduct and Contributor Guidelines.
Fork the repo on GitHub
Clone the project to your own machine
Commit changes to your own branch
Push your work back up to your fork
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!

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License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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.

davenicoll / github-action-atmos-terraform-plan

👽 Use Atmos with Terraform

Introduction

Usage

Prerequisites

Config

Workflow example

Migrating from `v1` to `v2`

Migrating from `v1` to `v2`

Inputs

Outputs

Related Projects

References

Use Terraform Reference Architectures for AWS

Day-0: Your Foundation for Success

Day-2: Your Operational Mastery

✨ Contributing

🌎 Slack Community

📰 Newsletter

📆 Office Hours

License

Trademarks

About

Languages

👽 Use Atmos with Terraform

Introduction

Usage

Prerequisites

Config

Workflow example

Migrating from v1 to v2

Migrating from v1 to v2

Inputs

Outputs

Related Projects

References

Use Terraform Reference Architectures for AWS

Day-0: Your Foundation for Success

Day-2: Your Operational Mastery

✨ Contributing

🌎 Slack Community

📰 Newsletter

📆 Office Hours

License

Trademarks

About

Languages

Migrating from `v1` to `v2`

Migrating from `v1` to `v2`