The UserSpace enables users to deploy and manage containers running on the rc_cube.


The UserSpace is available on the rc_cube I hardware model.


Familiarity with Docker containers is required.

If available and enabled, the UserSpace can be accessed by clicking UserSpace in the Web GUI.



The UserSpace is not enabled by default and can only be enabled/disabled or reset via a locally connected screen for security reasons.

Please connect a monitor, keyboard, and mouse to the rc_cube and then boot the rc_cube.

Enable UserSpace

The UserSpace can be enabled in two steps:

  1. Navigate to the pane UserSpace configuration and click enable UserSpace.
  2. If the UserSpace is enabled for the first time, a user for the portainer UI needs to be created: Click on the portainer pane, and register a user account for the administrator. It is required to complete this step within five minutes after clicking enable UserSpace

Disable UserSpace

The UserSpace can also be disabled. To disable the UserSpace, navigate to the pane UserSpace configuration and click disable UserSpace. Disabling will stop all running containers and the portainer UI, but not delete existing container images and their configurations. The UserSpace can be enabled again at any time.

Reset UserSpace

The UserSpace can also be reset. To reset the UserSpace, navigate to the pane UserSpace configuration click Reset UserSpace and answer the security question. Resetting will delete all containers, volumes, and the portainer configuration, including secrets and users.


An example container, called hello_rc_cube can be found under App Templates inside the UserSpace pane. Clicking Deploy the container under Actions starts the container. The running container is listed under Containers. The example container publishes information about itself on a website. The website’s address is a combination of the rc_cube’s IP address and the port listed under Published Ports. For example, the website will be located at if the published port is 8888 and the rc_cube’s IP address is

The repository with the hello_rc_cube template container is also publicly available at


Docker containers managed in the UserSpace can use the public interfaces of the rc_cube. In particular, Docker containers can access synchronized image sets via gRPC and can call the REST-API interface. The rc_cube (the host) can be accessed under the Docker bridge IP (in default Docker bridge network


Some restrictions for containers apply:

  • Containers cannot be privileged.
  • No access to the host network (a Docker bridge network is used instead).
  • Host folders cannot be mounted.
  • Host devices cannot be accessed. This includes e.g. USB and GPU devices.
  • Used and known ports on the host cannot be bound. This includes ports below 1024, the ports 2342, 2343, 2344, 2345, 3956, 4242, 4840, 5000, 5001, 5002, 5353, 6379, 7000, 8000, 8080, 9000, 9001, 9002, 9090, 9100, 9118, 9256, 9445, 9446, 11311, 50010, 50051, 50052, 50053, and 50054.