Skip to content

Docker Container Options

New

Introduced in 0.3.17

Pass options to Docker during Dokku's build, deploy and run phases

docker-options:add <app> <phase(s)> OPTION    # Add Docker option to app for phase (comma-separated phase list)
docker-options:clear <app> [<phase(s)>...]    # Clear a docker options from application
docker-options:remove <app> <phase(s)> OPTION # Remove Docker option from app for phase (comma-separated phase list)
docker-options:report [<app>] [<flag>]        # Displays a docker options report for one or more apps

Info

When specifying multiple phases, they must be comma-separated without spaces in between each phase, like so:

dokku docker-options:add node-js-app deploy,run "-v /var/log/node-js-app:/app/logs"

About Dokku phases

Dokku deploys your application in multiple "phases" and the docker-options plugin allows you to pass arguments to their underlying docker container:

  • build: the container that executes the appropriate buildpack
  • deploy: the container that executes your running/deployed application
  • run: the container that executes any arbitrary command via dokku run

Manipulation of docker options will not restart running containers. This enables multiple options to be set/unset before final application. As such, changing an app's docker options must be followed by a dokku ps:rebuild in order to take effect.

More information on supported Docker options can be found here: https://docs.docker.com/engine/reference/commandline/run/.

Examples

Add Docker options

Add some options for the deployed/running app and when executing dokku run:

# Mount a host volume in a Docker container: "-v /host/path:/container/path"
dokku docker-options:add node-js-app deploy "-v /var/log/node-js-app:/app/logs"
dokku docker-options:add node-js-app run "-v /var/log/node-js-app:/app/logs"

Note

When mounting a host directory in a Dokku app you should first create that directory as user dokku and then mount the directory under /app in the container using docker-options as above. Otherwise the app will lack write permission in the directory.

Remove a Docker option

dokku docker-options:remove node-js-app run "-v /var/log/node-js-app:/app/logs"

Clear all Docker options for an app

Docker options can be removed for a specific app using the docker-options:clear command.

dokku docker-options:clear node-js-app

-----> Clearing docker-options for node-js-app on all phases

One or more valid phases can also be specified. Phases are comma delimited, and specifying an invalid phase will result in an error.

dokku docker-options:clear node-js-app run

-----> Clearing docker-options for node-js-app on phase run

dokku docker-options:clear node-js-app build,run

-----> Clearing docker-options for node-js-app on phase build
-----> Clearing docker-options for node-js-app on phase run

Displaying docker-options reports for an app

New

Introduced in 0.8.1

You can get a report about the app's docker-options status using the docker-options:report command:

dokku docker-options:report

=====> node-js-app docker options information
       Docker options build:
       Docker options deploy: -v /var/log/node-js-app:/app/logs
       Docker options run:  -v /var/log/node-js-app:/app/logs
=====> python-sample docker options information
       Docker options build:
       Docker options deploy:
       Docker options run:
=====> ruby-sample docker options information
       Docker options build:
       Docker options deploy:
       Docker options run:

You can run the command for a specific app also.

dokku docker-options:report node-js-app

=====> node-js-app docker options information
       Docker options build:
       Docker options deploy: -v /var/log/node-js-app:/app/logs
       Docker options run:  -v /var/log/node-js-app:/app/logs

You can pass flags which will output only the value of the specific information you want. For example:

dokku docker-options:report node-js-app --docker-options-build