Answers for "ERROR: Couldn't connect to Docker daemon - you might need to run `docker-machine start default`."

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

$ docker-machine restart default
$ eval $(docker-machine env default)
// Apparently you need to run the eval $(docker-machine env default) every time you run the quick start terminal.

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock

sudo chmod 666 /var/run/docker.sock