Download the installer by clicking on the button named Boot2Docker-1.3.0.pkg to get the .pkg file, as shown in the following screenshot:

Double-click on the downloaded .pkg file and go through with the installation process.

Open the Finder window and navigate to your Applications folder; locate boot2docker and double-click on it. A terminal window will open and issue a few commands, as shown here:

This runs a Linux VM, named boot2docker-vm, that has Docker pre-installed in VirtualBox. The Docker service in the VM runs in daemon (background) mode, and a Docker client is installed in OS X, which communicates directly with the Docker daemon inside the VM via the Docker Remote API.

You will see a screen similar to the following screenshot, which tells you to set some environment variables:

We open up the ~/.bash_profile file and paste three lines from our output, as follows, at the end of this file:

export DOCKER_HOST=tcp://192.168.59.103:2376
export.DOCKER_CERT_PATH=/Users/xxx/.boot2docker/certs/boot2docker-vm
export DOCKER_TLS_VERIFY=1

The reason why we do this is so that our Docker client knows where to find the Docker daemon. If you want to find the IP in the future, you can do so by executing the boot2docker ip command. Adding the preceding lines will set these variables every time a new terminal session starts. When you're done, close the terminal window. Then, open a new window and type echo $DOCKER_HOST to verify that the environment variable is set as it should be. You should see the IP and port your boot2docker VM printed.

Type docker version to verify that you can use the Docker command. An output that looks similar to the last few lines of the preceding screenshot will mean that we have succeeded.