Mac OS X sudo docker Cannot connect to the Docker daemon. Is the docker daemon running on this host?

Question

I installed docker and there seems to be some issue.

$ docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

$sudo docker ps

Cannot connect to the Docker daemon. Is the docker daemon running on this host?

What should I do?

Answer 1

You need to set up your shell to use Docker: eval $(docker-machine env default) Where does this command come from? Run docker-machine env default and you'll see something like the following:

$ docker-machine env default
export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.99.100:2376"
export DOCKER_CERT_PATH="/Users/eric/.docker/machine/machines/default"
export DOCKER_MACHINE_NAME="default"
# Run this command to configure your shell: 
# eval $(docker-machine env default)

Also you may or may not have to simply start the Docker host beforehand via: docker-machine start default

Answer 2

docker-machine is a legacy stuff for OSX that operates with VirtualBox. What you should do is get rid of it completely, and then you should download the latest version of docker, that is called Docker for Mac

Make sure, you remove the legacy docker, and the docker-machine from your Mac before installing Docker for Mac. If you do not do that, the legacy docker binary will be favoured after the installation, and you will still get the error message, which says that cannot connect to the Docker daemon.