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Options for interacting with Docker.

Backend: pants.backend.docker
Config section: [docker]

Basic options


--docker-registries="{'key1': val1, 'key2': val2, ...}"
default: {}

Configure Docker registries. The schema for a registry entry is as follows:

    "registry-alias": {
        "address": "registry-domain:port",
        "default": bool,
        "extra_image_tags": [],
        "skip_push": bool,

If no registries are provided in a docker_image target, then all default addresses will be used, if any.

The docker_image.registries may be provided with a list of registry addresses and registry aliases prefixed with @ to be used instead of the defaults.

A configured registry is marked as default either by setting default = true or with an alias of "default".

A docker_image may be pushed to a subset of registries using the per registry skip_push option rather then the all or nothing toggle of the field option skip_push on the docker_image target.

Any image tags that should only be added for specific registries may be provided as the extra_image_tags option. The tags may use value formatting the same as for the image_tags field of the docker_image target.


default: {name}

Configure the default repository name used in the Docker image tag.

The value is formatted and may reference these variables (in addition to the normal placeheolders derived from the Dockerfile and build args etc):

  • name
  • directory
  • parent_directory

Example: --default-repository="{directory}/{name}".

The name variable is the docker_image's target name, directory and parent_directory are the name of the directory in which the BUILD file is for the target, and its parent directory respectively.

Use the repository field to set this value directly on a docker_image target.

Any registries or tags are added to the image name as required, and should not be part of the repository name.



Provide a default Docker build context root path for docker_image targets that does not specify their own context_root field.

The context root is relative to the build root by default, but may be prefixed with ./ to be relative to the directory of the BUILD file of the docker_image.




--docker-build-args="[<shell_str>, <shell_str>, ...]"
default: []

Global build arguments (for Docker --build-arg options) to use for all docker build invocations.

Entries are either strings in the form ARG_NAME=value to set an explicit value; or just ARG_NAME to copy the value from Pants's own environment.


build_args = ["VAR1=value", "VAR2"]

Use the extra_build_args field on a docker_image target for additional image specific build arguments.


default: None

Global default value for target_stage on docker_image targets, overriding the field value on the targets, if there is a matching stage in the Dockerfile.

This is useful to provide from the command line, to specify the target stage to build for at execution time.


default: False

Whether to log the Docker output to the console. If false, only the image ID is logged.


--docker-run-args="[<shell_str>, <shell_str>, ...]"
default: []

Additional arguments to use for docker run invocations.


$ ./pants run --docker-run-args="-p --name demo" src/example:image -- [image entrypoint args]

To provide the top-level options to the docker client, use [docker].env_vars to configure the Environment variables as appropriate.

The arguments for the image entrypoint may be passed on the command line after a double dash (--), or using the --run-args option.

Defaults to --interactive --tty when stdout is connected to a terminal.

Advanced options


--docker-env-vars="[<shell_str>, <shell_str>, ...]"
default: []

Environment variables to set for docker invocations.

Entries are either strings in the form ENV_VAR=value to set an explicit value; or just ENV_VAR to copy the value from Pants's own environment.


--docker-executable-search-paths="[<binary-paths>, <binary-paths>, ...]"

The PATH value that will be used to find the Docker client and any tools required.

The special string "<PATH>" will expand to the contents of the PATH env var.


--docker-tools="['<str>', '<str>', ...]"
default: []

List any additional executable tools required for Docker to work. The paths to these tools will be included in the PATH used in the execution sandbox, so that they may be used by the Docker client.

Deprecated options