About

GitHub Action to set up Docker Buildx.

💡 See also:

• login action
• setup-qemu action
• build-push action

---

• Usage
  • Quick start
  • With QEMU
  • Install by default
• Customizing
  • inputs
  • outputs
  • environment variables
• Keep up-to-date with GitHub Dependabot
• Limitation

Usage

Quick start

name: ci

on:
  push:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@master
        with:
          version: latest
      -
        name: Builder instance name
        run: echo ${{ steps.buildx.outputs.name }}
      -
        name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}

With QEMU

If you want support for more platforms you can use our setup-qemu action:

name: ci

on:
  push:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@master
        with:
          platforms: all
      -
        name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@master
        with:
          version: latest
      -
        name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}

Install by default

Implemented with https://github.com/docker/buildx#setting-buildx-as-default-builder-in-docker-1903

name: ci

on:
  push:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        uses: docker/setup-buildx-action@master
        id: buildx
        with:
          install: true
      -
        name: Build
        run: |
          docker build . # will run buildx

Customizing

inputs

Following inputs can be used as step.with keys

Name	Type	Description
version	String	Buildx version. (e.g. v0.3.0, latest)
driver	String	Sets the builder driver to be used (default docker-container)
driver-opts	CSV	List of additional driver-specific options
buildkitd-flags	String	Flags for buildkitd daemon
install	Bool	Sets up docker build command as an alias to docker buildx (default false)
use	Bool	Switch to this builder instance (default true)

CSV type must be a newline-delimited string

driver-opts: image=moby/buildkit:master

driver-opts: |
  image=moby/buildkit:master
  network=host

outputs

Following outputs are available

Name	Type	Description
name	String	Builder instance name
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.