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manifest-tool is a command line utility that implements a portion of the client side of theDocker registry v2.2 API for interacting with manifest objects in a registry conforming to thatspecification.

This tool was mainly created for the purpose of viewing, creating, and pushing thenew manifests list object type in the Docker registry.Manifest lists are defined in the v2.2 image specification and exist mainlyfor the purpose of supporting multi-architecture and/or multi-platform images within a Docker registry.

Note that manifest-tool was initially started as a joint project with Harshal Patil from IBM Bangalore, and originally forked from the registry client codebase, skopeo, by Antonio Murdaca/runc0m, that became a part of Project Atomic later in its lifetime. Thanks to both Antonio and Harshal for their initial work that made this possible! Also, note that work is ongoing to add these capabilities directly to the Docker client. Thanks to Christy Perez from IBM Systems for her hard work in pushing ahead with a docker/cli PR which should make this tool obsolete!

UPDATE (Feb 2018): The Docker client PR #138 is merged, providing a docker manifestcommand that can replace the use of manifest-tool in most scenarios. Otherfollow-on PRs are in process to add functionality to docker manifest to makeit completely functional for all multi-platform image use cases.

Sample Usage

The two main capabilities of this tool are to 1) inspect manifests (of all media types) within any registry supporting the Docker API and 2) to push manifest list objects to any registry which supports the Docker V2 API and the v2.2 image specification.

Note: For pushing to an authenticated registry like DockerHub, you will need a config generated viadocker login:

Important: Since 17.03, Docker for Mac stores credentials in the OSX/macOS keychain and not in config.json. This means for users ofmanifest-tool on Mac, you will need to specify --username and --password instead of relying on docker login credentials. Note that special characters mayneed escaping depending on your shell environment when provided via command line.

If you are pushing to a registry requiring authentication, credentials will be handled as follows:

  • If the --username and --password flags are supplied, their contents will be used as the basic credentials for any actions requiring authentication.
  • If --username and --password are not provided as command line flags, the default docker client config will be loaded (default location: $HOME/.docker/config.json) and credentials for the target registry will be queried if available.
  • If your docker config file is not in the standard location, you can provide an alternate directory location via the --docker-cfg flag and the config.json file will be used from that alternate directory.

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The following example shows the use of --docker-cfg to provide an alternate directory location for docker login-generated credentials when pushing a manifest list:

Inspect

You can inspect the manifest of any repo/image:tag combination by simply using the inspect command. Similar to the Docker client, if no tag is provided, latest is used as the tag. The output of an inspect on a manifest list media type is shown below. In the case of a manifest list the output shows all the platform-segregated details so the user can easily determine what platforms are supported by the image:

From this output we can clearly see this is a manifest list object (the media type is output as well) that has five platform definitions to support amd64, i386, s390x (z Systems), and ARMv7. To read more about manifest lists and how the Docker engine uses this information to determine what image/layers to pull read this blog post on multi-platform support in Docker.

Create/Push

Given that the Docker client does not have a way to perform the creation/pushing of manifest list objects (although see the note above regarding the in-process PR to correct this), the main role of manifest-tool is to create manifest list entries and push them to a Docker registry v2.2 API-supporting repository. The classic method to define the manifest list particulars is via a YAML file.

A sample YAML file is shown below. The cross-repository push feature is exploited in manifest-toolso that the source and target image names can differ as long as they are within the same registry.For example, a source image could be named myprivreg:5000/someimage_ppc64le:latest andreferenced by a manifest list in repository myprivreg:5000/someimage:latest.

With a private registry running on port 5000, a sample YAML input to create a manifest listcombining a ppc64le and amd64 image would look like this:

With the above YAML definition, creating the manifest list with the tool would use the following command:

In addition to the YAML file format, manifest-tool has the option to use command line arguments to provide the specified images/tags and platform OS/architecture details. Instead of from-spec you can use from-args with the following format:

On the command line you specify the platform os/arch pairs, a template for finding the source images for each input platform pair, and a target image name.

Specifically:

  • --platforms specifies which platforms you want to push for in the form OS/ARCH,OS/ARCH,...
  • --template specifies the image repo:tag source for inputs by replacing the placeholders OS and ARCH with the inputs from --platforms.
  • --target specifies the target image repo:tag that will be the manifest list entry in the registry.
Functional Changelog for Push/Create
  • Release v0.5.0:
  1. You can now specify --ignore-missing and if any of the input images are not available, the tool will output a warning but will not terminate. This allows for 'best case' creation of manifest lists based on available images at the time.
  2. Using the YAML input option, you can leave the platform specification empty and manifest-tool will auto-populate the platform definition by using the source image manifest OS/arch details. Note that this is potentially deficient for cases where the image was built in a cross-compiled fashion and the source image data is incorrect as it does not match the binary OS/arch content in the image layers.
  • Release v0.6.0:
  1. You can specify tags: as a list of additional tags to push to the registry against the target manifest list name being created (#32):
  • Release v0.7.0:
  1. The output of manifest-tool was modified to add the size of the manifest list canonical JSON pushed to the registry. This allows manifest list content to be signed using 3rd party tools like notary which needs the size of the object to validate and sign the content. This is used by the LinuxKit project to create signed manifest lists of all of their container images. Example output at the end of a successful manifest list create is shown below. Note that the size field is appended to the digest hash in this version:

Building

The releases of manifest-tool are built using the latest Go version; currently 1.12.x.

To build manifest-tool, clone this repository into your $GOPATH:

If you do not have a local Golang environment, you can use the make build target to build manifest-tool in a Golang 1.9.1-based container environment. This will require that you have Docker installed. The make static target will build a statically-linked binary, and make cross is used to build all supported CPU architectures, creating static binaries for each platform.

Note that signed binary releases are available on the project's GitHub releases page for several CPU architectures for Linux as well as OSX/macOS.

Using manifest-tool Without Installation

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Interested in using manifest-tool for simple query operations? For example,maybe you only want to query if a specific image:tag combination is a manifestlist entry or not, and if so, what platforms are listed in the manifest.

You can consume this feature of manifest-tool without installing the binaryas long as you are querying public (e.g. not private/authentication-requiringregistries) images via another project, mquery.

You can use mquery via a multi-platform image currently located on DockerHubas mplatform/mquery:latest. For example, you can query the mquery imageitself with the following command

Json

Note that the undefined reference in the output is due to the fact thatthe variant field isn't being filled out in the manifest list platformobject for this image.

The mquery program itself is a small Go program that queries functionsrunning via OpenWhisk in IBM Cloud Functions public serverless offering. Oneof those functions is packaged as a Docker container image withmanifest-tool installed. More information is available in themquery GitHub repo. You can read moreof the background details in my blog post about the Moby Summit EU talkon this topic.

Known Supporting Registries

Not every registry that claims Docker v2 image API and format support allows manifest lists to be pushed. The errors are not always clear; it could be blocking the blob mount API calls, or the push of the manifest list media type object. At this point, the good news is that the growth of interest in manifest list images has caused quite a few popular registries to add or fix Docker v2 API and image support for manifest lists. The following is a known list of publicly available Docker v2 conformant registries which have been tested with manifest-tool or docker manifest:

  1. DockerHub: Has supported manifest lists since 2016.
  2. Google Container Registry/gcr.io: gcr.io manifest list support was fixed in 4Q2017.
  3. IBM Cloud Container Registry: The IBM public cloud container registry supports manifest lists since the latter half of 2017.
  4. Microsoft Azure Container Registry/azurecr.io: The Azure CR supports manifest lists.

Test a Registry for 'Manifest List' Support

If you operate or use a registry claiming conformance to the Docker distribution v2 API and v2.2 imagespecification you may want to confirm that this image registry supports the manifest list media typeand the APIs used to create a manifest list.

This GitHub repo now has a pre-configured test script which will use readily available multi-architecturecontent from DockerHub and tag, push, and then combine it into a manifest list against any image registryyou point it to. See the test-registry.sh script in this repo's integration directoryfor further details. A simple use of the script isshown below to test a private registry:

Note: This script will expect login detailshave already been provided to docker login andwill use those stored credentials for push andAPI access to somerepo on r.myprivreg.com.

License

manifest-tool is licensed under the Apache Software License (ASL) 2.0