have you found a solution for this problem? I cannot find anywhere the dockerd executable. How am I supposed to start the daemon when having only a command line? I have installed the Docker.App to /Applications but I am running in headless mode and have only access to ssh to my Mac machine.
Because I had this error just now (October, 2017), but this thread was the first hit on the search engines when I searched for it, I thought it would be a good idea to return to this thread to answer the question.
The official Docker.app download doesn’t have this problem, but you will get it if you use homebrew’s docker (brew install docker). The solution in this case is to install docker-machine, or boot2docker. Boot2docker is deprecated, so I used docker-machine