When following Exercise 3.2 Building a Container Image with Docker Assemble I get the following error:
$ docker assemble backend start docker: 'assemble' is not a docker command. See 'docker --help'
But after enabling Experimental features in the Daemon Preferences, the Docker assemble cli plugin appears to be installed and functioning.
When disabling Experimental features the assemble and several other cli plugins are removed and unavailable again.
This should behavior is not mentioned in the “Docker Enterprise 3.0 Public Beta Exercises” document. It should at least be mentioned somewhere around 3.1.1 Enable Kubernetes.