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README.md

buildx

Docker CLI plugin for extended build capabilities with BuildKit

buildx is Tech Preview

TL;DR

  • Familiar UI from docker build
  • Full BuildKit capabilities with container driver
  • Multiple builder instance support
  • Multi-node builds for cross-platform images
  • Compose build support
  • WIP: High-level build constructs (bake)
  • TODO: In-container driver support

Table of Contents

Installing

Using buildx as a docker CLI plugin requires using Docker 19.03. A limited set of functionality works with older versions of Docker when invoking the binary directly.

Docker CE

buildx comes bundled with Docker CE starting with 19.03, but requires experimental mode to be enabled on the Docker CLI. To enable it, "experimental": "enabled" can be added to the CLI configuration file ~/.docker/config.json. An alternative is to set the DOCKER_CLI_EXPERIMENTAL=enabled environment variable.

Binary release

Download the latest binary release from https://github.com/docker/buildx/releases/latest and copy it to ~/.docker/cli-plugins folder with name docker-buildx.

Change the permission to execute:

chmod a+x ~/.docker/cli-plugins/docker-buildx

After installing you can run docker buildx to see the new commands.

Building

with Docker 18.09+

$ git clone git://github.com/docker/buildx && cd buildx
$ make install

with buildx or Docker 19.03

$ export DOCKER_BUILDKIT=1
$ docker build --platform=local -o . git://github.com/docker/buildx
$ mv buildx ~/.docker/cli-plugins/docker-buildx

Getting started

Building with buildx

Buildx is a Docker CLI plugin that extends the docker build command with the full support of the features provided by Moby BuildKit builder toolkit. It provides the same user experience as docker build with many new features like creating scoped builder instances and building against multiple nodes concurrently.

After installation, buildx can be accessed through the docker buildx command. docker buildx build is the command for starting a new build.

$ docker buildx build .
[+] Building 8.4s (23/32)
 => ...

Buildx will always build using the BuildKit engine and does not require DOCKER_BUILDKIT=1 environment variable for starting builds.

Buildx build command supports the features available for docker build including the new features in Docker 19.03 such as outputs configuration, inline build caching or specifying target platform. In addition, buildx supports new features not yet available for regular docker build like building manifest lists, distributed caching, exporting build results to OCI image tarballs etc.

Buildx is supposed to be flexible and can be run in different configurations that are exposed through a driver concept. Currently, we support a "docker" driver that uses the BuildKit library bundled into the docker daemon binary, and a "docker-container" driver that automatically launches BuildKit inside a Docker container. We plan to add more drivers in the future, for example, one that would allow running buildx inside an (unprivileged) container.

The user experience of using buildx is very similar across drivers, but there are some features that are not currently supported by the "docker" driver, because the BuildKit library bundled into docker daemon currently uses a different storage component. In contrast, all images built with "docker" driver are automatically added to the "docker images" view by default, whereas when using other drivers the method for outputting an image needs to be selected with --output.

Working with builder instances

By default, buildx will initially use the "docker" driver if it is supported, providing a very similar user experience to the native docker build. But using a local shared daemon is only one way to build your applications.

Buildx allows you to create new instances of isolated builders. This can be used for getting a scoped environment for your CI builds that does not change the state of the shared daemon or for isolating the builds for different projects. You can create a new instance for a set of remote nodes, forming a build farm, and quickly switch between them.

New instances can be created with docker buildx create command. This will create a new builder instance with a single node based on your current configuration. To use a remote node you can specify the DOCKER_HOST or remote context name while creating the new builder. After creating a new instance you can manage its lifecycle with the inspect, stop and rm commands and list all available builders with ls. After creating a new builder you can also append new nodes to it.

To switch between different builders use docker buildx use <name>. After running this command the build commands would automatically keep using this builder.

Docker 19.03 also features a new docker context command that can be used for giving names for remote Docker API endpoints. Buildx integrates with docker context so that all of your contexts automatically get a default builder instance. While creating a new builder instance or when adding a node to it you can also set the context name as the target.

Building multi-platform images

BuildKit is designed to work well for building for multiple platforms and not only for the architecture and operating system that the user invoking the build happens to run.

When invoking a build, the --platform flag can be used to specify the target platform for the build output, (e.g. linux/amd64, linux/arm64, darwin/amd64). When the current builder instance is backed by the "docker-container" driver, multiple platforms can be specified together. In this case, a manifest list will be built, containing images for all of the specified architectures. When this image is used in docker run or docker service, Docker will pick the correct image based on the node’s platform.

Multi-platform images can be built by mainly three different strategies that are all supported by buildx and Dockerfiles. You can use the QEMU emulation support in the kernel, build on multiple native nodes using the same builder instance or use a stage in Dockerfile to cross-compile to different architectures.

QEMU is the easiest way to get started if your node already supports it (e.g. if you are using Docker Desktop). It requires no changes to your Dockerfile and BuildKit will automatically detect the secondary architectures that are available. When BuildKit needs to run a binary for a different architecture it will automatically load it through a binary registered in the binfmt_misc handler.

Using multiple native nodes provides better support for more complicated cases not handled by QEMU and generally have better performance. Additional nodes can be added to the builder instance with --append flag.

# assuming contexts node-amd64 and node-arm64 exist in "docker context ls"
$ docker buildx create --use --name mybuild node-amd64
mybuild
$ docker buildx create --append --name mybuild node-arm64
$ docker buildx build --platform linux/amd64,linux/arm64 .

Finally, depending on your project, the language that you use may have good support for cross-compilation. In that case, multi-stage builds in Dockerfiles can be effectively used to build binaries for the platform specified with --platform using the native architecture of the build node. List of build arguments like BUILDPLATFORM and TARGETPLATFORM are available automatically inside your Dockerfile and can be leveraged by the processes running as part of your build.

FROM --platform=$BUILDPLATFORM golang:alpine AS build
ARG TARGETPLATFORM
ARG BUILDPLATFORM
RUN echo "I am running on $BUILDPLATFORM, building for $TARGETPLATFORM" > /log
FROM alpine
COPY --from=build /log /log

High-level build options

Buildx also aims to provide support for higher level build concepts that go beyond invoking a single build command. We want to support building all the images in your application together and let the users define project specific reusable build flows that can then be easily invoked by anyone.

BuildKit has great support for efficiently handling multiple concurrent build requests and deduplicating work. While build commands can be combined with general-purpose command runners (eg. make), these tools generally invoke builds in sequence and therefore can’t leverage the full potential of BuildKit parallelization or combine BuildKit’s output for the user. For this use case we have added a command called docker buildx bake.

Currently, the bake command supports building images from compose files, similar to compose build but allowing all the services to be built concurrently as part of a single request.

There is also support for custom build rules from HCL/JSON files allowing better code reuse and different target groups. The design of bake is in very early stages and we are looking for feedback from users.

Documentation

buildx build [OPTIONS] PATH | URL | -

The buildx build command starts a build using BuildKit. This command is similar to the UI of docker build command and takes the same flags and arguments.

Options:

Flag Description
--add-host [] Add a custom host-to-IP mapping (host:ip)
--allow [] Allow extra privileged entitlement, e.g. network.host, security.insecure
--build-arg [] Set build-time variables
--cache-from [] External cache sources (eg. user/app:cache, type=local,src=path/to/dir)
--cache-to [] Cache export destinations (eg. user/app:cache, type=local,dest=path/to/dir)
--file string Name of the Dockerfile (Default is 'PATH/Dockerfile')
--iidfile string Write the image ID to the file
--label [] Set metadata for an image
--load Shorthand for --output=type=docker
--network string Set the networking mode for the RUN instructions during build (default "default")
--no-cache Do not use cache when building the image
--output [] Output destination (format: type=local,dest=path)
--platform [] Set target platform for build
--progress string Set type of progress output (auto, plain, tty). Use plain to show container output (default "auto")
--pull Always attempt to pull a newer version of the image
--push Shorthand for --output=type=registry
--secret [] Secret file to expose to the build: id=mysecret,src=/local/secret
--ssh [] SSH agent socket or keys to expose to the build (format: default
--tag [] Name and optionally a tag in the 'name:tag' format
--target string Set the target build stage to build.

For documentation on most of these flags refer to docker build documentation in https://docs.docker.com/engine/reference/commandline/build/ . In here we’ll document a subset of the new flags.

--platform=value[,value]

Set the target platform for the build. All FROM commands inside the Dockerfile without their own --platform flag will pull base images for this platform and this value will also be the platform of the resulting image. The default value will be the current platform of the buildkit daemon.

When using docker-container driver with buildx, this flag can accept multiple values as an input separated by a comma. With multiple values the result will be built for all of the specified platforms and joined together into a single manifest list.

If theDockerfile needs to invoke the RUN command, the builder needs runtime support for the specified platform. In a clean setup, you can only execute RUN commands for your system architecture. If your kernel supports binfmt_misc https://en.wikipedia.org/wiki/Binfmt_misc launchers for secondary architectures buildx will pick them up automatically. Docker desktop releases come with binfmt_misc automatically configured for arm64 and arm architectures. You can see what runtime platforms your current builder instance supports by running docker buildx inspect --bootstrap.

Inside a Dockerfile, you can access the current platform value through TARGETPLATFORM build argument. Please refer to docker build documentation for the full description of automatic platform argument variants https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope .

The formatting for the platform specifier is defined in https://github.com/containerd/containerd/blob/v1.2.6/platforms/platforms.go#L63 .

Examples:

docker buildx build --platform=linux/arm64 .
docker buildx build --platform=linux/amd64,linux/arm64,linux/arm/v7 .
docker buildx build --platform=darwin .

-o, --output=[PATH,-,type=TYPE[,KEY=VALUE]

Sets the export action for the build result. In docker build all builds finish by creating a container image and exporting it to docker images. buildx makes this step configurable allowing results to be exported directly to the client, oci image tarballs, registry etc.

Supported exported types are:

local

The local export type writes all result files to a directory on the client. The new files will be owned by the current user. On multi-platform builds, all results will be put in subdirectories by their platform.

Attribute key:

  • dest - destination directory where files will be written
tar

The tar export type writes all result files as a single tarball on the client. On multi-platform builds all results will be put in subdirectories by their platform.

Attribute key:

  • dest - destination path where tarball will be written. “-” writes to stdout.
oci

The oci export type writes the result image or manifest list as an OCI image layout tarball https://github.com/opencontainers/image-spec/blob/master/image-layout.md on the client.

Attribute key:

  • dest - destination path where tarball will be written. “-” writes to stdout.
docker

The docker export type writes the single-platform result image as a Docker image specification tarball https://github.com/moby/moby/blob/master/image/spec/v1.2.md on the client. Tarballs created by this exporter are also OCI compatible.

Currently, multi-platform images cannot be exported with the docker export type. The most common usecase for multi-platform images is to directly push to a registry (see registry).

Attribute keys:

  • dest - destination path where tarball will be written. If not specified the tar will be loaded automatically to the current docker instance.
  • context - name for the docker context where to import the result
image

The image exporter writes the build result as an image or a manifest list. When using docker driver the image will appear in docker images. Optionally image can be automatically pushed to a registry by specifying attributes.

Attribute keys:

  • name - name (references) for the new image.
  • push - boolean to automatically push the image.
registry

The registry exporter is a shortcut for type=image,push=true.

Buildx with docker driver currently only supports local, tarball exporter and image exporter. docker-container driver supports all the exporters.

If just the path is specified as a value, buildx will use the local exporter with this path as the destination. If the value is “-”, buildx will use tar exporter and write to stdout.

Examples:

docker buildx build -o . .
docker buildx build -o outdir .
docker buildx build -o - - > out.tar
docker buildx build -o type=docker .
docker buildx build -o type=docker,dest=- . > myimage.tar
docker buildx build -t tonistiigi/foo -o type=registry 

--push

Shorthand for --output=type=registry. Will automatically push the build result to registry.

--load

Shorthand for --output=type=docker. Will automatically load the single-platform build result to docker images.

--cache-from=[NAME|type=TYPE[,KEY=VALUE]]

Use an external cache source for a build. Supported types are registry and local. The registry source can import cache from a cache manifest or (special) image configuration on the registry. The local source can export cache from local files previously exported with --cache-to.

If no type is specified, registry exporter is used with a specified reference.

docker driver currently only supports importing build cache from the registry.

Examples:

docker buildx build --cache-from=user/app:cache .
docker buildx build --cache-from=user/app .
docker buildx build --cache-from=type=registry,ref=user/app .
docker buildx build --cache-from=type=local,src=path/to/cache .

--cache-to=[NAME|type=TYPE[,KEY=VALUE]]

Export build cache to an external cache destination. Supported types are registry, local and inline. Registry exports build cache to a cache manifest in the registry, local exports cache to a local directory on the client and inline writes the cache metadata into the image configuration.

docker driver currently only supports exporting inline cache metadata to image configuration. Alternatively, --build-arg BUILDKIT_INLINE_CACHE=1 can be used to trigger inline cache exporter.

Attribute key:

  • mode - Specifies how many layers are exported with the cache. “min” on only exports layers already in the final build build stage, “max” exports layers for all stages. Metadata is always exported for the whole build.

Examples:

docker buildx build --cache-to=user/app:cache .
docker buildx build --cache-to=type=inline .
docker buildx build --cache-to=type=registry,ref=user/app .
docker buildx build --cache-to=type=local,dest=path/to/cache .

--allow=ENTITLEMENT

Allow extra privileged entitlement. List of entitlements:

  • network.host - Allows executions with host networking.
  • security.insecure - Allows executions without sandbox. See related Dockerfile extensions.

For entitlements to be enabled, the buildkitd daemon also needs to allow them with --allow-insecure-entitlement (see create --buildkitd-flags)

Example:

$ docker buildx create --use --name insecure-builder --buildkitd-flags '--allow-insecure-entitlement security.insecure'
$ docker buildx build --allow security.insecure .

buildx create [OPTIONS] [CONTEXT|ENDPOINT]

Create makes a new builder instance pointing to a docker context or endpoint, where context is the name of a context from docker context ls and endpoint is the address for docker socket (eg. DOCKER_HOST value).

By default, the current docker configuration is used for determining the context/endpoint value.

Builder instances are isolated environments where builds can be invoked. All docker contexts also get the default builder instance.

Options:

Flag Description
--append Append a node to builder instead of changing it
--buildkitd-flags string Flags for buildkitd daemon
--config string BuildKit config file
--driver string Driver to use (eg. docker-container)
--driver-opt stringArray Options for the driver
--leave Remove a node from builder instead of changing it
--name string Builder instance name
--node string Create/modify node with given name
--platform stringArray Fixed platforms for current node
--use Set the current builder instance

--append

Changes the action of the command to appends a new node to an existing builder specified by --name. Buildx will choose an appropriate node for a build based on the platforms it supports.

Example:

$ docker buildx create mycontext1
eager_beaver
$ docker buildx create --name eager_beaver --append mycontext2
eager_beaver

--buildkitd-flags FLAGS

Adds flags when starting the buildkitd daemon. They take precedence over the configuration file specified by --config. See buildkitd --help for the available flags.

Example:

--buildkitd-flags '--debug --debugaddr 0.0.0.0:6666'

--config FILE

Specifies the configuration file for the buildkitd daemon to use. The configuration can be overridden by --buildkitd-flags. See an example buildkitd configuration file.

--driver DRIVER

Sets the builder driver to be used. There are two available drivers, each have their own specificities.

  • docker - Uses the builder that is built into the docker daemon. With this driver, the --load flag is implied by default on buildx build. However, building multi-platform images or exporting cache is not currently supported.

  • docker-container - Uses a buildkit container that will be spawned via docker. With this driver, both building multi-platform images and exporting cache are supported. However, images built will not automatically appear in docker images (see build --load).

--driver-opt OPTIONS

Passes additional driver-specific options. Details for each driver:

  • docker - No driver options
  • docker-container
    • image - Sets the container image to be used for running buildkit.
    • network - Sets the network mode for running the buildkit container.
    • Example:
      --driver docker-container --driver-opt image=moby/buildkit:master,network=host
      

--leave

Changes the action of the command to removes a node from a builder. The builder needs to be specified with --name and node that is removed is set with --node.

Example:

docker buildx create --name mybuilder --node mybuilder0 --leave

--name NAME

Specifies the name of the builder to be created or modified. If none is specified, one will be automatically generated.

--node NODE

Specifies the name of the node to be created or modified. If none is specified, it is the name of the builder it belongs to, with an index number suffix.

--platform PLATFORMS

Sets the platforms supported by the node. It expects a comma-separated list of platforms of the form OS/architecture/variant. The node will also automatically detect the platforms it supports, but manual values take priority over the detected ones and can be used when multiple nodes support building for the same platform.

Example:

docker buildx create --platform linux/amd64
docker buildx create --platform linux/arm64,linux/arm/v8

--use

Automatically switches the current builder to the newly created one. Equivalent to running docker buildx use $(docker buildx create ...).

buildx use NAME

Switches the current builder instance. Build commands invoked after this command will run on a specified builder. Alternatively, a context name can be used to switch to the default builder of that context.

buildx inspect [NAME]

Shows information about the current or specified builder.

Example:

Name:   elated_tesla
Driver: docker-container

Nodes:
Name:      elated_tesla0
Endpoint:  unix:///var/run/docker.sock
Status:    running
Platforms: linux/amd64

Name:      elated_tesla1
Endpoint:  ssh://ubuntu@1.2.3.4
Status:    running
Platforms: linux/arm64, linux/arm/v7, linux/arm/v6

--bootstrap

Ensures that the builder is running before inspecting it. If the driver is docker-container, then --bootstrap starts the buildkit container and waits until it is operational. Bootstrapping is automatically done during build, it is thus not necessary. The same BuildKit container is used during the lifetime of the associated builder node (as displayed in buildx ls).

buildx ls

Lists all builder instances and the nodes for each instance

Example:

docker buildx ls
NAME/NODE       DRIVER/ENDPOINT             STATUS  PLATFORMS
elated_tesla *  docker-container
  elated_tesla0 unix:///var/run/docker.sock running linux/amd64
  elated_tesla1 ssh://ubuntu@1.2.3.4        running linux/arm64, linux/arm/v7, linux/arm/v6
default         docker
  default       default                     running linux/amd64

Each builder has one or more nodes associated with it. The current builder’s name is marked with a *.

buildx stop [NAME]

Stops the specified or current builder. This will not prevent buildx build to restart the builder. The implementation of stop depends on the driver.

buildx rm [NAME]

Removes the specified or current builder. It is a no-op attempting to remove the default builder.

buildx bake [OPTIONS] [TARGET...]

Bake is a high-level build command.

Each specified target will run in parallel as part of the build.

Options:

Flag Description
-f, --file stringArray Build definition file
--no-cache Do not use cache when building the image
--print Print the options without building
--progress string Set type of progress output (auto, plain, tty). Use plain to show container output (default "auto")
--pull Always attempt to pull a newer version of the image
--set stringArray Override target value (eg: target.key=value)

-f, --file FILE

Specifies the bake definition file. The file can be a Docker Compose, JSON or HCL file. If multiple files are specified they are all read and configurations are combined. By default, if no files are specified, the following are parsed: docker-compose.yml docker-compose.yaml docker-bake.json docker-bake.override.json docker-bake.hcl docker-bake.override.hcl

--no-cache

Same as build --no-cache. Do not use cache when building the image.

--print

Prints the resulting options of the targets desired to be built, in a JSON format, without starting a build.

$ docker buildx bake -f docker-bake.hcl --print db
{
   "target": {
      "db": {
         "context": "./",
         "dockerfile": "Dockerfile",
         "tags": [
            "docker.io/tiborvass/db"
         ]
      }
   }
}

--progress

Same as build --progress. Set type of progress output (auto, plain, tty). Use plain to show container output (default "auto").

--pull

Same as build --pull.

--set target.key[.subkey]=value

Override target configurations from command line.

Example:

docker buildx bake --set target.args.mybuildarg=value
docker buildx bake --set target.platform=linux/arm64

File definition

In addition to compose files, bake supports a JSON and an equivalent HCL file format for defining build groups and targets.

A target reflects a single docker build invocation with the same options that you would specify for docker build. A group is a grouping of targets.

Multiple files can include the same target and final build options will be determined by merging them together.

In the case of compose files, each service corresponds to a target.

A group can specify its list of targets with the targets option. A target can inherit build options by setting the inherits option to the list of targets or groups to inherit from.

Note: Design of bake command is work in progress, the user experience may change based on feedback.

Example HCL defintion:

group "default" {
	targets = ["db", "webapp-dev"]
}

target "webapp-dev" {
	dockerfile = "Dockerfile.webapp"
	tags = ["docker.io/username/webapp"]
}

target "webapp-release" {
	inherits = ["webapp-dev"]
	platforms = ["linux/amd64", "linux/arm64"]
}

target "db" {
	dockerfile = "Dockerfile.db"
	tags = ["docker.io/username/db"]
}

buildx imagetools create [OPTIONS] [SOURCE] [SOURCE...]

Imagetools contains commands for working with manifest lists in the registry. These commands are useful for inspecting multi-platform build results.

Create creates a new manifest list based on source manifests. The source manifests can be manifest lists or single platform distribution manifests and must already exist in the registry where the new manifest is created. If only one source is specified create performs a carbon copy.

Options:

Flag Description
--append Append to existing manifest
--dry-run Show final image instead of pushing
-f, --file stringArray Read source descriptor from file
-t, --tag stringArray Set reference for new image

--append

Append appends the new sources to an existing manifest list in the destination.

--dry-run

Do not push the image, just show it.

-f, --file FILE

Reads source from files. A source can be a manifest digest, manifest reference or a JSON of OCI descriptor object.

-t, --tag IMAGE

Name of the image to be created.

Examples:

docker buildx imagetools create --dry-run alpine@sha256:5c40b3c27b9f13c873fefb2139765c56ce97fd50230f1f2d5c91e55dec171907 sha256:c4ba6347b0e4258ce6a6de2401619316f982b7bcc529f73d2a410d0097730204

docker buildx imagetools create -t tonistiigi/myapp -f image1 -f image2 

buildx imagetools inspect NAME

Show details of image in the registry.

Example:

$ docker buildx imagetools inspect alpine
Name:      docker.io/library/alpine:latest
MediaType: application/vnd.docker.distribution.manifest.list.v2+json
Digest:    sha256:28ef97b8686a0b5399129e9b763d5b7e5ff03576aa5580d6f4182a49c5fe1913

Manifests:
  Name:      docker.io/library/alpine:latest@sha256:5c40b3c27b9f13c873fefb2139765c56ce97fd50230f1f2d5c91e55dec171907
  MediaType: application/vnd.docker.distribution.manifest.v2+json
  Platform:  linux/amd64

  Name:      docker.io/library/alpine:latest@sha256:c4ba6347b0e4258ce6a6de2401619316f982b7bcc529f73d2a410d0097730204
  MediaType: application/vnd.docker.distribution.manifest.v2+json
  Platform:  linux/arm/v6

 ...

--raw

Raw prints the original JSON bytes instead of the formatted output.

Setting buildx as default builder in Docker 19.03+

Running docker buildx install sets up docker builder command as an alias to docker buildx. This results in the ability to have docker build use the current buildx builder.

To remove this alias, you can run docker buildx uninstall.

Contributing

Want to contribute to Buildx? Awesome! You can find information about contributing to this project in the CONTRIBUTING.md

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