I have run through StackOverflow and other questions / docs - including the official ones and still have not been able to start docker. Given the latest info here are a couple of options tried:

$ docker daemon
`docker daemon` is not supported on Darwin. Please run `dockerd` directly
16:20:54/Applications $dockerd
-bash: dockerd: command not found

docker-machine also surfaces as an option but that is gone for some time.

So what is the canonical way to start the docker daemon? If it matters I am on Sierra : and the docker is the latest downloaded today 12/12/17.

 $docker version
Client:
 Version:      17.11.0-ce
 API version:  1.34
 Go version:   go1.9.2
 Git commit:   1caf76c
 Built:        unknown-buildtime
 OS/Arch:      darwin/amd64
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

It is also worrisome that the URI referred to starts with unix. Is there some preparation and/or configuration step(s) I missed?