About

GitHub Action to set up Docker Buildx.

If you are interested, check out my other GitHub Actions!

---

• Usage
  • Quick start
  • Build and push to DockerHub
  • Leverage buildx cache
• Projects using this action
• Customizing
  • inputs
  • outputs
  • environment variables
• Keep up-to-date with GitHub Dependabot
• Limitation
• How can I help?
• License

Usage

Quick start

Here is a simple example to build a Docker image with buildx (BuildKit)

name: buildx

on:
  pull_request:
    branches: master
  push:
    branches: master
    tags:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Set up Docker Buildx
        id: buildx
        uses: crazy-max/ghaction-docker-buildx@v3
        with:
          buildx-version: latest
          qemu-version: latest
      -
        name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}
      -
        name: Run Buildx
        run: |
          docker buildx build \
            --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x \
            --output "type=image,push=false" \
            --file ./test/Dockerfile ./test

Build and push to DockerHub

Another example to build and push Diun Docker image on DockerHub.

• On push event, Docker image crazymax/diun:edge is built and pushed on DockerHub.
• On pull_request event, Docker image crazymax/diun:edge is built.
• On schedule event, Docker image crazymax/diun:nightly is built and pushed on DockerHub.
• On push tags event, Docker image crazymax/diun:<version> and crazymax/diun:latest is built and pushed on DockerHub.

name: buildx

on:
  schedule:
    - cron: '0 10 * * *' # everyday at 10am
  pull_request:
    branches: master
  push:
    branches: master
    tags:
      - v*

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Prepare
        id: prepare
        run: |
          DOCKER_IMAGE=crazymax/diun
          DOCKER_PLATFORMS=linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/386,linux/ppc64le,linux/s390x
          VERSION=edge

          if [[ $GITHUB_REF == refs/tags/* ]]; then
            VERSION=${GITHUB_REF#refs/tags/v}
          fi
          if [ "${{ github.event_name }}" = "schedule" ]; then
            VERSION=nightly
          fi

          TAGS="--tag ${DOCKER_IMAGE}:${VERSION}"
          if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
            TAGS="$TAGS --tag ${DOCKER_IMAGE}:latest"
          fi

          echo ::set-output name=docker_image::${DOCKER_IMAGE}
          echo ::set-output name=version::${VERSION}
          echo ::set-output name=buildx_args::--platform ${DOCKER_PLATFORMS} \
            --build-arg VERSION=${VERSION} \
            --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') \
            --build-arg VCS_REF=${GITHUB_SHA::8} \
            ${TAGS} --file ./test/Dockerfile ./test
      -
        name: Set up Docker Buildx
        uses: crazy-max/ghaction-docker-buildx@v3
      -
        name: Docker Buildx (build)
        run: |
          docker buildx build --output "type=image,push=false" ${{ steps.prepare.outputs.buildx_args }}
      -
        name: Login to DockerHub
        if: success() && github.event_name != 'pull_request'
        uses: crazy-max/ghaction-docker-login@v1
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      -
        name: Docker Buildx (push)
        if: success() && github.event_name != 'pull_request'
        run: |
          docker buildx build --output "type=image,push=true" ${{ steps.prepare.outputs.buildx_args }}
      -
        name: Inspect image
        if: always() && github.event_name != 'pull_request'
        run: |
          docker buildx imagetools inspect ${{ steps.prepare.outputs.docker_image }}:${{ steps.prepare.outputs.version }}

Leverage buildx cache

You can leverage cache using @actions/cache with this action.

name: buildx

on:
  pull_request:
    branches: master
  push:
    branches: master

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Set up Docker Buildx
        uses: crazy-max/ghaction-docker-buildx@v3
      -
        name: Cache Docker layers
        uses: actions/cache@v2
        id: cache
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-
      -
        name: Docker Buildx (build)
        run: |
          docker buildx build \
            --cache-from "type=local,src=/tmp/.buildx-cache" \
            --cache-to "type=local,dest=/tmp/.buildx-cache" \
            --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x \
            --output "type=image,push=false" \
            --tag crazymax/diun:latest \
            --file ./Dockerfile-diun ./
      -
        name: Login to DockerHub
        uses: crazy-max/ghaction-docker-login@v1
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      -
        name: Docker Buildx (push)
        run: |
          docker buildx build \
            --cache-from "type=local,src=/tmp/.buildx-cache" \
            --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x \
            --output "type=image,push=true" \
            --tag crazymax/diun:latest \
            --file ./Dockerfile-diun ./
      -
        name: Inspect image
        run: |
          docker buildx imagetools inspect crazymax/diun:latest

Projects using this action

• Diun
• GO Simple Tunnel
• RSSHub
• Cloudflared

Customizing

inputs

Following inputs can be used as step.with keys

Name	Type	Default	Description
buildx-version	String	latest	Buildx version. Example: v0.3.0
qemu-version	String	latest	qemu-user-static version (Docker tag). Example: 4.2.0-7

outputs

Following outputs are available

Name	Type	Description
platforms	String	Available platforms (comma separated)

environment variables

The following official docker environment variables are supported:

Name	Type	Default	Description
DOCKER_CONFIG	String	~/.docker	The location of your client configuration files

Keep up-to-date with GitHub Dependabot

Since Dependabot has native GitHub Actions support, to enable it on your GitHub repo all you need to do is add the .github/dependabot.yml file:

version: 2
updates:
  # Maintain dependencies for GitHub Actions
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "daily"

Limitation

This action is only available for Linux virtual environments.

How can I help?

All kinds of contributions are welcome 🙌! The most basic way to show your support is to star 🌟 the project, or to raise issues 💬 You can also support this project by becoming a sponsor on GitHub 👏 or by making a Paypal donation to ensure this journey continues indefinitely! 🚀

Thanks again for your support, it is much appreciated! 🙏

License

MIT. See LICENSE for more details.