docker-build-push/README.md

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[![GitHub release](https://img.shields.io/github/release/docker/build-push-action.svg?style=flat-square)](https://github.com/docker/build-push-action/releases/latest)
[![GitHub marketplace](https://img.shields.io/badge/marketplace-docker--build--push-blue?logo=github&style=flat-square)](https://github.com/marketplace/actions/docker-build-push)
[![CI workflow](https://img.shields.io/github/workflow/status/docker/build-push-action/ci?label=ci&logo=github&style=flat-square)](https://github.com/docker/build-push-action/actions?workflow=ci)
[![Test workflow](https://img.shields.io/github/workflow/status/docker/build-push-action/test?label=test&logo=github&style=flat-square)](https://github.com/docker/build-push-action/actions?workflow=test)
## About
GitHub Action to build and push Docker images with [Buildx](https://github.com/docker/buildx).
> :bulb: See also:
> * [login](https://github.com/docker/login-action) action
> * [setup-buildx](https://github.com/docker/setup-buildx-action) action
> * [setup-qemu](https://github.com/docker/setup-qemu-action) action
![Screenshot](.github/build-push-action.png)
___
* [Usage](#usage)
* [Git context](#git-context)
* [Path context](#path-context)
* [Isolated builders](#isolated-builders)
* [Multi-platform image](#multi-platform-image)
* [Leverage GitHub cache](#leverage-github-cache)
* [Complete workflow](#complete-workflow)
* [Customizing](#customizing)
* [inputs](#inputs)
* [outputs](#outputs)
* [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
* [Limitation](#limitation)
## Usage
This action uses our [setup-buildx](https://github.com/docker/setup-buildx-action) action that extends the
`docker build` command named [buildx](https://github.com/docker/buildx) with the full support of the features
provided by [Moby BuildKit](https://github.com/moby/buildkit) builder toolkit. This includes multi-arch build,
build-secrets, remote cache, etc. and different builder deployment/namespacing options.
### Git context
The default behavior of this action is to use the Git context invoked by your workflow (`https://github.com/owner/repo#ref`).
```yaml
name: ci
on:
push:
branches: master
jobs:
main:
runs-on: ubuntu-latest
steps:
-
name: Set up QEMU
uses: docker/setup-qemu-action@master
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@master
-
name: Login to DockerHub
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
-
name: Build and push
id: docker_build
uses: docker/build-push-action@v2
with:
push: true
tags: user/app:latest
-
name: Image digest
run: echo ${{ steps.docker_build.outputs.digest }}
```
If you use this action in a private repository, you have to pass the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token)
as a secret named `GIT_AUTH_TOKEN` to be able to authenticate against it with buildx:
```yaml
-
name: Build and push
id: docker_build
uses: docker/build-push-action@v2
with:
push: true
tags: user/app:latest
secrets: |
GIT_AUTH_TOKEN=${{ github.token }}
```
### Path context
You can also use the `PATH` context alongside the [`actions/checkout`](https://github.com/actions/checkout/) action.
```yaml
name: ci
on:
push:
branches: master
jobs:
path-context:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Set up QEMU
uses: docker/setup-qemu-action@master
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@master
-
name: Login to DockerHub
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
-
name: Build and push
uses: docker/build-push-action@v2
with:
context: .
file: ./Dockerfile
platforms: linux/amd64,linux/arm64,linux/386
push: true
tags: user/app:latest
```
### Isolated builders
```yaml
name: ci
on:
push:
branches: master
jobs:
multi-builders:
runs-on: ubuntu-latest
steps:
-
uses: docker/setup-buildx-action@master
id: builder1
-
uses: docker/setup-buildx-action@master
id: builder2
-
name: Builder 1 name
run: echo ${{ steps.builder1.outputs.name }}
-
name: Builder 2 name
run: echo ${{ steps.builder2.outputs.name }}
-
name: Build against builder1
uses: docker/build-push-action@v2
with:
builder: ${{ steps.builder1.outputs.name }}
target: mytarget1
-
name: Build against builder2
uses: docker/build-push-action@v2
with:
builder: ${{ steps.builder2.outputs.name }}
target: mytarget2
```
### Multi-platform image
```yaml
name: ci
on:
push:
branches: master
jobs:
multi:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Set up QEMU
uses: docker/setup-qemu-action@master
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@master
-
name: Login to DockerHub
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
-
name: Build and push
uses: docker/build-push-action@v2
with:
context: .
file: ./Dockerfile
platforms: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x
push: true
tags: |
user/app:latest
user/app:1.0.0
```
### Local registry
For testing purposes you may need to create a [local registry](https://hub.docker.com/_/registry) to push images into.
```yaml
name: ci
on:
push:
branches: master
jobs:
local-registry:
runs-on: ubuntu-latest
services:
registry:
image: registry:2
ports:
- 5000:5000
steps:
-
name: Set up QEMU
uses: docker/setup-qemu-action@master
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@master
with:
driver-opts: network=host
-
name: Build and push to local registry
uses: docker/build-push-action@v2
with:
push: true
tags: localhost:5000/name/app:latest
-
name: Inspect
run: |
docker buildx imagetools inspect localhost:5000/name/app:latest
```
### Leverage GitHub cache
You can leverage [GitHub cache](https://docs.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows)
using [@actions/cache](https://github.com/actions/cache) with this action.
```yaml
name: ci
on:
push:
branches: master
jobs:
github-cache:
runs-on: ubuntu-latest
steps:
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@master
-
name: Cache Docker layers
uses: actions/cache@v2
with:
path: /tmp/.buildx-cache
key: ${{ runner.os }}-buildx-${{ github.sha }}
restore-keys: |
${{ runner.os }}-buildx-
-
name: Login to DockerHub
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
-
name: Build and push
uses: docker/build-push-action@v2
with:
push: true
tags: user/app:latest
cache-from: type=local,src=/tmp/.buildx-cache
cache-to: type=local,dest=/tmp/.buildx-cache
```
### Complete workflow
* On `pull_request` event, Docker image `name/app:edge` is **built**.
* On `push` event, Docker image `name/app:edge` is **built** and **pushed** to DockerHub.
* On `schedule` event, Docker image `name/app:nightly` is **built** and **pushed** to DockerHub.
* On `push tags` event, Docker image `name/app:<version>` and `name/app:latest` is **built** and **pushed** to DockerHub.
```yaml
name: ci
on:
schedule:
- cron: '0 10 * * *' # everyday at 10am
push:
branches: master
tags:
- 'v*.*.*'
pull_request:
branches: master
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Prepare
id: prep
run: |
DOCKER_IMAGE=name/app
VERSION=edge
if [[ $GITHUB_REF == refs/tags/* ]]; then
VERSION=${GITHUB_REF#refs/tags/v}
fi
if [ "${{ github.event_name }}" = "schedule" ]; then
VERSION=nightly
fi
TAGS="${DOCKER_IMAGE}:${VERSION}"
if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
TAGS="$TAGS,${DOCKER_IMAGE}:latest"
fi
echo ::set-output name=tags::${TAGS}
-
name: Set up QEMU
uses: docker/setup-qemu-action@master
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@master
-
name: Login to DockerHub
if: github.event_name != 'pull_request'
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
-
name: Build and push
id: docker_build
uses: docker/build-push-action@v2
with:
context: .
file: ./Dockerfile
platforms: linux/amd64,linux/arm64,linux/386
push: ${{ github.event_name != 'pull_request' }}
tags: ${{ steps.prep.outputs.tags }}
```
## Customizing
### inputs
Following inputs can be used as `step.with` keys
| Name | Type | Description |
|---------------------|---------|------------------------------------|
| `builder` | String | Builder instance (see [setup-buildx](https://github.com/docker/setup-buildx-action) action) |
| `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)) |
| `file` | String | Path to the Dockerfile (default `Dockerfile`) |
| `build-args` | List | List of build-time variables |
| `labels` | List | List of metadata for an image |
| `tags` | List | List of tags |
| `pull` | Bool | Always attempt to pull a newer version of the image (default `false`) |
| `target` | String | Sets the target stage to build |
| `allow` | List | List of [extra privileged entitlement](https://github.com/docker/buildx#--allowentitlement) (eg. `network.host,security.insecure`) |
| `no-cache` | Bool | Do not use cache when building the image (default `false`) |
| `platforms` | List | List of [target platforms](https://github.com/docker/buildx#---platformvaluevalue) for build |
| `load` | Bool | [Load](https://github.com/docker/buildx#--load) is a shorthand for `--output=type=docker` (default `false`) |
| `push` | Bool | [Push](https://github.com/docker/buildx#--push) is a shorthand for `--output=type=registry` (default `false`) |
| `outputs` | CSV | List of [output destinations](https://github.com/docker/buildx#-o---outputpath-typetypekeyvalue) (format: `type=local,dest=path`) |
| `cache-from` | CSV | List of [external cache sources](https://github.com/docker/buildx#--cache-fromnametypetypekeyvalue) (eg. `type=local,src=path/to/dir`) |
| `cache-to` | CSV | List of [cache export destinations](https://github.com/docker/buildx#--cache-tonametypetypekeyvalue) (eg. `type=local,dest=path/to/dir`) |
| `secrets` | CSV | List of secrets to expose to the build (eg. `key=value`, `GIT_AUTH_TOKEN=mytoken`) |
> `List` type can be a comma or newline-delimited string
> ```yaml
> tags: name/app:latest,name/app:1.0.0
> ```
> ```yaml
> tags: |
> name/app:latest
> name/app:1.0.0
> ```
> `CSV` type must be a newline-delimited string
> ```yaml
> cache-from: user/app:cache
> ```
> ```yaml
> cache-from: |
> user/app:cache
> type=local,src=path/to/dir
> ```
### outputs
Following outputs are available
| Name | Type | Description |
|---------------|---------|---------------------------------------|
| `digest` | String | Image content-addressable identifier also called a digest |
## Keep up-to-date with GitHub Dependabot
Since [Dependabot](https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot)
has [native GitHub Actions support](https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#package-ecosystem),
to enable it on your GitHub repo all you need to do is add the `.github/dependabot.yml` file:
```yaml
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](https://help.github.com/en/articles/virtual-environments-for-github-actions#supported-virtual-environments-and-hardware-resources).