mirror: docker/setup-buildx-action@v3
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[](https://github.com/docker/setup-buildx-action/releases/latest)
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[](https://github.com/marketplace/actions/docker-setup-buildx)
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[](https://github.com/docker/setup-buildx-action/actions?workflow=ci)
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[](https://github.com/docker/setup-buildx-action/actions?workflow=test)
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[](https://codecov.io/gh/docker/setup-buildx-action)
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## About
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GitHub Action to set up Docker [Buildx](https://github.com/docker/buildx).
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This action will create and boot a builder that can be used in the following
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steps of your workflow if you're using Buildx or the [`build-push` action](https://github.com/docker/build-push-action/).
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By default, the [`docker-container` driver](https://docs.docker.com/build/building/drivers/docker-container/)
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will be used to be able to build multi-platform images and export cache using
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a [BuildKit](https://github.com/moby/buildkit) container.
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___
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* [Usage](#usage)
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* [Configuring your builder](#configuring-your-builder)
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* [Customizing](#customizing)
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* [inputs](#inputs)
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* [outputs](#outputs)
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* [environment variables](#environment-variables)
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* [Notes](#notes)
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* [`nodes` output](#nodes-output)
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* [Contributing](#contributing)
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## Usage
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```yaml
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name: ci
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on:
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push:
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jobs:
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buildx:
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runs-on: ubuntu-latest
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steps:
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-
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name: Checkout
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uses: actions/checkout@v5
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-
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# Add support for more platforms with QEMU (optional)
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# https://github.com/docker/setup-qemu-action
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name: Set up QEMU
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uses: docker/setup-qemu-action@v3
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-
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name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v3
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```
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## Configuring your builder
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* [Version pinning](https://docs.docker.com/build/ci/github-actions/configure-builder/#version-pinning): Pin to a specific Buildx or BuildKit version
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* [BuildKit container logs](https://docs.docker.com/build/ci/github-actions/configure-builder/#buildkit-container-logs): Enable BuildKit container logs for debugging purposes
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* [BuildKit Daemon configuration](https://docs.docker.com/build/ci/github-actions/configure-builder/#buildkit-daemon-configuration)
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* [Registry mirror](https://docs.docker.com/build/ci/github-actions/configure-builder/#registry-mirror): Configure a registry mirror for your builds
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* [Max parallelism](https://docs.docker.com/build/ci/github-actions/configure-builder/#max-parallelism): Configure the maximum parallelism for your builds
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* [Append additional nodes to the builder](https://docs.docker.com/build/ci/github-actions/configure-builder/#append-additional-nodes-to-the-builder): Create additional nodes for your builder
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* [Authentication for remote builders](https://docs.docker.com/build/ci/github-actions/configure-builder/#authentication-for-remote-builders)
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* [SSH authentication](https://docs.docker.com/build/ci/github-actions/configure-builder/#ssh-authentication): Authenticate to a remote builder using SSH
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* [TLS authentication](https://docs.docker.com/build/ci/github-actions/configure-builder/#tls-authentication): Authenticate to a remote builder using TLS
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* [Standalone mode](https://docs.docker.com/build/ci/github-actions/configure-builder/#standalone-mode): Use Buildx as a standalone binary (without the Docker CLI)
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* [Isolated builders](https://docs.docker.com/build/ci/github-actions/configure-builder/#isolated-builders): Create isolated builders for your builds
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## Customizing
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### inputs
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The following inputs can be used as `step.with` keys:
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> `List` type is a newline-delimited string
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> ```yaml
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> driver-opts: |
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> image=moby/buildkit:master
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> network=host
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> ```
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> `CSV` type must be a comma-delimited string
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> ```yaml
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> platforms: linux/amd64,linux/arm64
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> ```
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| Name | Type | Default | Description |
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|------------------------------|----------|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `version` | String | | [Buildx](https://github.com/docker/buildx) version. (eg. `v0.3.0`, `latest`, `https://github.com/docker/buildx.git#master`) |
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| `name` | String | | Name of the builder. If not specified, one will be generated or if it already exists, it will be used instead of creating a new one |
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| `driver` | String | `docker-container` | Sets the [builder driver](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver) to be used |
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| `driver-opts` | List | | List of additional [driver-specific options](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver-opt) (eg. `image=moby/buildkit:master`) |
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| `buildkitd-flags` | String | | [BuildKit daemon flags](https://docs.docker.com/engine/reference/commandline/buildx_create/#buildkitd-flags) |
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| `buildkitd-config` \* | String | | [BuildKit daemon config file](https://docs.docker.com/engine/reference/commandline/buildx_create/#config) |
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| `buildkitd-config-inline` \* | String | | Same as `buildkitd-config` but inline |
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| `install` \* | Bool | `false` | Sets up `docker build` command as an alias to `docker buildx` |
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| `use` | Bool | `true` | Switch to this builder instance |
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| `endpoint` | String | | [Optional address for docker socket](https://docs.docker.com/engine/reference/commandline/buildx_create/#description) or context from `docker context ls` |
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| `platforms` | List/CSV | | Fixed [platforms](https://docs.docker.com/engine/reference/commandline/buildx_create/#platform) for current node. If not empty, values take priority over the detected ones |
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| `append` | YAML | | [Append additional nodes](https://docs.docker.com/build/ci/github-actions/configure-builder/#append-additional-nodes-to-the-builder) to the builder |
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| `keep-state` | Bool | `false` | Keep BuildKit state on `cleanup`. This is only useful on persistent self-hosted runners |
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| `cache-binary` | Bool | `true` | Cache buildx binary to GitHub Actions cache backend |
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| `cleanup` | Bool | `true` | Cleanup temp files and remove builder at the end of a job |
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> [!IMPORTANT]
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> If you set the `buildkitd-flags` input, the default flags (`--allow-insecure-entitlement security.insecure --allow-insecure-entitlement network.host`)
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> will be reset. If you want to retain the default behavior, make sure to
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> include these flags in your custom `buildkitd-flags` value.
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> [!NOTE]
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> `buildkitd-config` and `buildkitd-config-inline` are mutually exclusive.
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> [!NOTE]
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> `install` input is deprecated and will be removed in a future release. This
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> input is not necessary when building with our actions like
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> `docker/build-push-action` or `docker/bake-action`. If you are still building
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> with the `docker build` command then you can set the `BUILDX_BUILDER`
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> environment variable, or you can just directly invoke the
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> `docker buildx build` command: https://github.com/docker/setup-buildx-action/pull/455
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### outputs
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The following outputs are available:
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| Name | Type | Description |
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|-------------|--------|-----------------------------------------------------|
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| `name` | String | Builder name |
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| `driver` | String | Builder driver |
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| `platforms` | String | Builder node platforms (preferred and/or available) |
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| `nodes` | JSON | Builder [nodes metadata](#nodes-output) |
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### environment variables
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The following [official docker environment variables](https://docs.docker.com/engine/reference/commandline/cli/#environment-variables) are supported:
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| Name | Type | Default | Description |
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|-----------------|--------|-------------|-------------------------------------------------|
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| `DOCKER_CONFIG` | String | `~/.docker` | The location of your client configuration files |
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## Notes
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### `nodes` output
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```json
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[
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{
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"name": "builder-3820d274-502c-4498-ae24-d4c32b3023d90",
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"endpoint": "unix:///var/run/docker.sock",
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"driver-opts": [
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"network=host",
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"image=moby/buildkit:master"
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],
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"status": "running",
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"buildkitd-flags": "--allow-insecure-entitlement security.insecure --allow-insecure-entitlement network.host",
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"buildkit": "3fab389",
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"platforms": "linux/amd64,linux/amd64/v2,linux/amd64/v3,linux/amd64/v4,linux/386"
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}
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]
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```
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| Name | Type | Description |
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|-------------------|--------|----------------------------|
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| `name` | String | Node name |
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| `endpoint` | String | Node endpoint |
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| `driver-opts` | List | Options for the driver |
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| `status` | String | Node status |
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| `buildkitd-flags` | String | Flags for buildkitd daemon |
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| `buildkit` | String | BuildKit version |
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| `platforms` | String | Platforms available |
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## Contributing
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Want to contribute? Awesome! You can find information about contributing to
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this project in the [CONTRIBUTING.md](/.github/CONTRIBUTING.md)
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