254 lines
11 KiB
Markdown
254 lines
11 KiB
Markdown
[](https://github.com/docker/build-push-action/releases/latest)
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[](https://github.com/marketplace/actions/build-and-push-docker-images)
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[](https://github.com/docker/build-push-action/actions?workflow=ci)
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[](https://github.com/docker/build-push-action/actions?workflow=test)
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[](https://codecov.io/gh/docker/build-push-action)
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## Upgrade from v1
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`v2` of this action includes significant updates and now uses Docker [Buildx](https://github.com/docker/buildx). It's
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also rewritten as a [typescript-action](https://github.com/actions/typescript-action/) to be as close as possible
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of the [GitHub Runner](https://github.com/actions/virtual-environments) during its execution.
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[Upgrade notes](UPGRADE.md) with many [usage examples](#advanced-usage) have been added to handle most use cases but
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`v1` is still available through [`releases/v1` branch](https://github.com/docker/build-push-action/tree/releases/v1).
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## About
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GitHub Action to build and push Docker images with [Buildx](https://github.com/docker/buildx) with full support of the
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features provided by [Moby BuildKit](https://github.com/moby/buildkit) builder toolkit. This includes multi-platform
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build, secrets, remote cache, etc. and different builder deployment/namespacing options.
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> :bulb: See also:
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> * [login](https://github.com/docker/login-action) action
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> * [setup-buildx](https://github.com/docker/setup-buildx-action) action
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> * [setup-qemu](https://github.com/docker/setup-qemu-action) action
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___
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* [Usage](#usage)
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* [Git context](#git-context)
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* [Path context](#path-context)
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* [Advanced usage](#advanced-usage)
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* [Multi-platform image](docs/advanced/multi-platform.md)
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* [Secrets](docs/advanced/secrets.md)
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* [Isolated builders](docs/advanced/isolated-builders.md)
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* [Push to multi-registries](docs/advanced/push-multi-registries.md)
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* [Cache](docs/advanced/cache.md)
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* [Registry cache](docs/advanced/cache.md#registry-cache)
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* [GitHub cache](docs/advanced/cache.md#github-cache)
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* [Local registry](docs/advanced/local-registry.md)
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* [Export image to Docker](docs/advanced/export-docker.md)
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* [Handle tags and labels](docs/advanced/tags-labels.md)
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* [Update DockerHub repo description](docs/advanced/dockerhub-desc.md)
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* [Customizing](#customizing)
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* [inputs](#inputs)
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* [outputs](#outputs)
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* [Troubleshooting](#troubleshooting)
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* [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
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* [Limitation](#limitation)
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## Usage
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By default, this action uses the [Git context](#git-context) so you don't need to use the
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[`actions/checkout`](https://github.com/actions/checkout/) action to checkout the repository because this will be
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done directly by buildkit. The git reference will be based on the [event that triggered your workflow](https://docs.github.com/en/actions/reference/events-that-trigger-workflows)
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and will result in the following context: `https://github.com/<owner>/<repo>.git#<ref>`.
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Be careful because **any file mutation in the steps that precede the build step will be ignored** since
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the context is based on the git reference. However, you can use the [Path context](#path-context) using the
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[`context` input](#inputs) alongside the [`actions/checkout`](https://github.com/actions/checkout/) action to remove
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this restriction.
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In the examples below we are using 3 other actions:
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* [`setup-buildx`](https://github.com/docker/setup-buildx-action) action will create and boot a builder using by
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default the `docker-container` [builder driver](https://github.com/docker/buildx#--driver-driver). This is
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**not required but recommended** using it to be able to build multi-platform images, export cache, etc.
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* [`setup-qemu`](https://github.com/docker/setup-qemu-action) action can be useful if you want
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to add emulation support with QEMU to be able to build against more platforms.
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* [`login`](https://github.com/docker/login-action) action will take care to log in against a Docker registry.
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### Git context
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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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branches:
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- 'master'
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jobs:
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docker:
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runs-on: ubuntu-latest
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steps:
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-
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name: Set up QEMU
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uses: docker/setup-qemu-action@v1
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-
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name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v1
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-
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name: Login to DockerHub
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uses: docker/login-action@v1
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_TOKEN }}
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-
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name: Build and push
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id: docker_build
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uses: docker/build-push-action@v2
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with:
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push: true
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tags: user/app:latest
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-
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name: Image digest
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run: echo ${{ steps.docker_build.outputs.digest }}
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```
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Building from the current repository automatically uses the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token)
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so it does not need to be passed. If you want to authenticate against another private repository, you have to use
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a [secret](docs/advanced/secrets.md) named `GIT_AUTH_TOKEN` to be able to authenticate against it with buildx:
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```yaml
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-
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name: Build and push
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id: docker_build
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uses: docker/build-push-action@v2
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with:
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push: true
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tags: user/app:latest
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secrets: |
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GIT_AUTH_TOKEN=${{ secrets.MYTOKEN }}
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```
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> :warning: Subdir for Git context is not yet supported ([moby/buildkit#1684](https://github.com/moby/buildkit/issues/1684))
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> but you can use the [path context](#path-context) in the meantime. More info on [Docker docs website](https://docs.docker.com/engine/reference/commandline/build/#git-repositories).
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### Path context
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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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branches:
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- 'master'
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jobs:
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docker:
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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@v2
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-
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name: Set up QEMU
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uses: docker/setup-qemu-action@v1
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-
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name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v1
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-
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name: Login to DockerHub
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uses: docker/login-action@v1
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_TOKEN }}
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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context: .
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push: true
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tags: user/app:latest
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```
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## Advanced usage
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* [Multi-platform image](docs/advanced/multi-platform.md)
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* [Secrets](docs/advanced/secrets.md)
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* [Isolated builders](docs/advanced/isolated-builders.md)
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* [Push to multi-registries](docs/advanced/push-multi-registries.md)
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* [Cache](docs/advanced/cache.md)
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* [Registry cache](docs/advanced/cache.md#registry-cache)
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* [GitHub cache](docs/advanced/cache.md#github-cache)
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* [Local registry](docs/advanced/local-registry.md)
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* [Export image to Docker](docs/advanced/export-docker.md)
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* [Handle tags and labels](docs/advanced/tags-labels.md)
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* [Update DockerHub repo description](docs/advanced/dockerhub-desc.md)
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## Customizing
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### inputs
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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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> cache-from: |
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> user/app:cache
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> type=local,src=path/to/dir
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> ```
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> `CSV` type is a comma-delimited string
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> ```yaml
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> tags: name/app:latest,name/app:1.0.0
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> ```
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| Name | Type | Description |
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|---------------------|----------|------------------------------------|
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| `builder` | String | Builder instance (see [setup-buildx](https://github.com/docker/setup-buildx-action) action) |
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| `context` | String | Build's context is the set of files located in the specified [`PATH` or `URL`](https://docs.docker.com/engine/reference/commandline/build/) (default [Git context](#git-context)) |
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| `file` | String | Path to the Dockerfile. (default `{context}/Dockerfile`) |
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| `build-args` | List | List of build-time variables |
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| `labels` | List | List of metadata for an image |
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| `tags` | List/CSV | List of tags |
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| `pull` | Bool | Always attempt to pull a newer version of the image (default `false`) |
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| `target` | String | Sets the target stage to build |
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| `allow` | List/CSV | List of [extra privileged entitlement](https://github.com/docker/buildx#--allowentitlement) (eg. `network.host,security.insecure`) |
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| `no-cache` | Bool | Do not use cache when building the image (default `false`) |
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| `platforms` | List/CSV | List of [target platforms](https://github.com/docker/buildx#---platformvaluevalue) for build |
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| `load` | Bool | [Load](https://github.com/docker/buildx#--load) is a shorthand for `--output=type=docker` (default `false`) |
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| `push` | Bool | [Push](https://github.com/docker/buildx#--push) is a shorthand for `--output=type=registry` (default `false`) |
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| `outputs` | List | List of [output destinations](https://github.com/docker/buildx#-o---outputpath-typetypekeyvalue) (format: `type=local,dest=path`) |
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| `cache-from` | List | List of [external cache sources](https://github.com/docker/buildx#--cache-fromnametypetypekeyvalue) (eg. `type=local,src=path/to/dir`) |
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| `cache-to` | List | List of [cache export destinations](https://github.com/docker/buildx#--cache-tonametypetypekeyvalue) (eg. `type=local,dest=path/to/dir`) |
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| `secrets` | List | List of secrets to expose to the build (eg. `key=string`, `GIT_AUTH_TOKEN=mytoken`) |
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| `secret-files` | List | List of secret files to expose to the build (eg. `key=filename`, `MY_SECRET=./secret.txt`) |
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| `ssh` | List | List of SSH agent socket or keys to expose to the build |
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### outputs
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Following outputs are available
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| Name | Type | Description |
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|---------------|---------|---------------------------------------|
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| `digest` | String | Image content-addressable identifier also called a digest |
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## Troubleshooting
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See [TROUBLESHOOTING.md](TROUBLESHOOTING.md)
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## Keep up-to-date with GitHub Dependabot
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Since [Dependabot](https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot)
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has [native GitHub Actions support](https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#package-ecosystem),
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to enable it on your GitHub repo all you need to do is add the `.github/dependabot.yml` file:
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```yaml
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version: 2
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updates:
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# Maintain dependencies for GitHub Actions
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- package-ecosystem: "github-actions"
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directory: "/"
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schedule:
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interval: "daily"
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```
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## Limitation
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This action is only available for Linux [virtual environments](https://help.github.com/en/articles/virtual-environments-for-github-actions#supported-virtual-environments-and-hardware-resources).
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