About

GitHub Action to set up Docker Buildx.

This action will create and boot a builder that can be used in the following steps of your workflow if you're using Buildx or the build-push action. By default, the docker-container driver will be used to be able to build multi-platform images and export cache using a BuildKit container.

---

• Usage
• Advanced usage
  • Authentication support
  • Append additional nodes to the builder
  • Install by default
  • BuildKit daemon configuration
  • Standalone mode
• Customizing
  • inputs
  • outputs
  • environment variables
• Notes
  • nodes output
  • BuildKit container logs
• Keep up-to-date with GitHub Dependabot

Usage

name: ci

on:
  push:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v3
      -
        # Add support for more platforms with QEMU (optional)
        # https://github.com/docker/setup-qemu-action
        name: Set up QEMU
        uses: docker/setup-qemu-action@v2
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

Advanced usage

• Authentication support
• Append additional nodes to the builder
• Install by default
• BuildKit daemon configuration
• Standalone mode

Customizing

inputs

Following inputs can be used as step.with keys:

List type is a newline-delimited string

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

CSV type must be a newline-delimited string

platforms: linux/amd64,linux/arm64

Name	Type	Description
version	String	Buildx version. (eg. v0.3.0, latest, https://github.com/docker/buildx.git#master)
driver	String	Sets the builder driver to be used (default docker-container)
driver-opts	List	List of additional driver-specific options (eg. image=moby/buildkit:master)
buildkitd-flags	String	Flags for buildkitd daemon (since buildx v0.3.0)
install	Bool	Sets up docker build command as an alias to docker buildx (default false)
use	Bool	Switch to this builder instance (default true)
endpoint	String	Optional address for docker socket or context from docker context ls
platforms	List/CSV	Fixed platforms for current node. If not empty, values take priority over the detected ones.
config¹	String	BuildKit config file
config-inline¹	String	Same as config but inline
append	YAML	Append additional nodes to the builder

• ¹ config and config-inline are mutually exclusive

outputs

Following outputs are available

Name	Type	Description
name	String	Builder name
driver	String	Builder driver
platforms	String	Builder node platforms (preferred or available)
nodes	JSON	Builder nodes metadata

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

Notes

nodes output

[
  {
     "name": "builder-3820d274-502c-4498-ae24-d4c32b3023d90",
     "endpoint": "unix:///var/run/docker.sock",
     "driver-opts": [
       "network=host",
       "image=moby/buildkit:master"
     ],
    "status": "running",
    "buildkitd-flags": "--allow-insecure-entitlement security.insecure --allow-insecure-entitlement network.host",
    "buildkit": "3fab389",
    "platforms": "linux/amd64,linux/amd64/v2,linux/amd64/v3,linux/amd64/v4,linux/386"
  }
]

Name	Type	Description
name	String	Node name
endpoint	String	Node endpoint
driver-opts	List	Options for the driver
status	String	Node status
buildkitd-flags	String	Flags for buildkitd daemon
buildkit	String	BuildKit version
platforms	String	Platforms available

BuildKit container logs

To display BuildKit container logs (when docker-container driver is used) you have to enable step debug logging, or you can also enable debugging in the setup-buildx action step:

  -
    name: Set up Docker Buildx
    uses: docker/setup-buildx-action@v2
    with:
      buildkitd-flags: --debug

Logs will be available at the end of a job:

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"