docker stack config

Outputs the final config file, after doing merges and interpolations

Swarm This command works with the Swarm orchestrator.


$ docker stack config [OPTIONS]

Refer to the options section for an overview of available OPTIONS for this command.


Outputs the final Compose file, after doing the merges and interpolations of the input Compose files.

For example uses of this command, refer to the examples section below.


Name, shorthand Default Description
--compose-file , -c Path to a Compose file, or - to read from stdin
--skip-interpolation Skip interpolation and output only merged config


The following command outputs the result of the merge and interpolation of two Compose files.

$ docker stack config --compose-file docker-compose.yml --compose-file

The Compose file can also be provided as standard input with --compose-file -:

$ cat docker-compose.yml | docker stack config --compose-file -

Skipping interpolation

In some cases, it might be useful to skip interpolation of environment variables. For example, when you want to pipe the output of this command back to stack deploy.

If you have a regex for a redirect route in an environment variable for your webserver you would use two $ signs to prevent stack deploy from interpolating ${1}.

  service: webserver

With interpolation, the stack config command will replace the environment variable in the Compose file with REDIRECT_REGEX=http://host/redirect/${1}, but then when piping it back to the stack deploy command it will be interpolated again and result in undefined behavior. That is why, when piping the output back to stack deploy one should always prefer the --skip-interpolation option.

$ docker stack config --compose-file web.yml --compose-file --skip-interpolation | docker stack deploy --compose-file -

Parent command

Command Description
docker stack Manage Swarm stacks
Command Description
docker stack config Outputs the final config file, after doing merges and interpolations
docker stack deploy Deploy a new stack or update an existing stack
docker stack ls List stacks
docker stack ps List the tasks in the stack
docker stack rm Remove one or more stacks
docker stack services List the services in the stack