Wanted to try using my Mac natively rather than my usual Linux VM — I get this when

gc local up

docker   Couldn't connect to Docker daemon - you might need to run `docker-machine start default`.

No idea where to turn. Running the command suggested yields this:

Docker machine "default" does not exist. Use "docker-machine ls" to list machines. Use "docker-machine create" to add a new one.

Have you installed docker for mac?

Of course I did 🙂