Keep getting Could not read CA certificate when trying to start docker

Question

I am attempting to migrate from boot2docker to docker-machine.

I followed the directions here to install docker but I keep getting the following message:

Answer 1

I encountered the same error due to the reason that I had setup the environment to a particular docker machine which I later deleted but my environment was still set to the deleted machine. So docker calls were being redirected the a non-existant machine causing the error.

I unset the environment variables and the issue was fixed:

eval $(docker-machine env -u)

To see which environment variable would be unset run:

docker-machine env -u