And Docker is “native” on Linux, but must run in a VM on Mac; the Docker for Mac product. My theory: the disparity is the overhead of Docker containerization on the Mac. Docker on OS X with batteries included, aimed at making a more pleasant local development experience. Runs on top of docker-machine. Faster volume sharing using NFS rather than built-in virtualbox/vmware file shares.

Docker for Mac vs. Docker Toolbox Estimated reading time: 8 minutes If you already have an installation of Docker Toolbox, read these topics first to learn how Docker for Mac and Docker Toolbox differ, and how they can coexist. The Docker Toolbox environment Docker Toolbox installs docker, docker-compose, and docker-machine in /usr/local/bin on your Mac. It also installs VirtualBox. At installation time, Toolbox uses docker-machine to provision a VirtualBox VM called default, running the boot2docker Linux distribution, with with certificates located on your Mac at $HOME/.docker/machine/machines/default.

Before you use docker or docker-compose on your Mac, you typically use the command eval $(docker-machine env default) to set environment variables so that docker or docker-compose know how to talk to Docker Engine running on VirtualBox. This setup is shown in the following diagram.

The Docker for Mac environment Docker for Mac is a Mac native application, that you install in /Applications. At installation time, it creates symlinks in /usr/local/bin for docker and docker-compose and others, to the commands in the application bundle, in /Applications/Docker.app/Contents/Resources/bin. Here are some key points to know about Docker for Mac before you get started: • Docker for Mac uses instead of Virtual Box. Hyperkit is a lightweight macOS virtualization solution built on top of Hypervisor.framework in macOS 10.10 Yosemite and higher. • When you install Docker for Mac, machines created with Docker Machine are not affected. • Docker for Mac does not use docker-machine to provision its VM. The Docker Engine API is exposed on a socket available to the Mac host at /var/run/docker.sock.

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This is the default location Docker and Docker Compose clients use to connect to the Docker daemon, so you can use docker and docker-compose CLI commands on your Mac. This setup is shown in the following diagram. With Docker for Mac, you only get (and only usually need) one VM, managed by Docker for Mac. Docker for Mac automatically upgrades the Docker client and daemon when updates are available. Also note that Docker for Mac can’t route traffic to containers, so you can’t directly access an exposed port on a running container from the hosting machine.

If you do need multiple VMs, such as when testing multi-node swarms, you can continue to use Docker Machine, which operates outside the scope of Docker for Mac. Setting up to run Docker for Mac • Check whether Toolbox DOCKER environment variables are set. $ env grep DOCKER DOCKER_HOST=tcp://192.168.99.100:2376 DOCKER_MACHINE_NAME=default DOCKER_TLS_VERIFY=1 DOCKER_CERT_PATH=/Users//.docker/machine/machines/default If this command returns no output, you are ready to use Docker for Mac. If it returns output (as shown in the example), unset the DOCKER environment variables to make the client talk to the Docker for Mac Engine (next step).

• Run the unset command on the following DOCKER environment variables to unset them in the current shell. $ docker-machine ls NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS aws-sandbox - amazonec2 Running tcp://52.90.113.128:2376 v1.10.0 default * virtualbox Running tcp://192.168.99.100:2376 v1.10.1 docker-sandbox - digitalocean Running tcp://104.131.43.236:2376 v1.10.0 You might also run into a similar situation with Docker Universal Control Plane (UCP). There are a few ways to address this problem and keep using your older machines. One solution is to use a version manager like. Migrating from Docker Toolbox to Docker for Mac Docker for Mac does not propose Toolbox image migration as part of its installer since version 18.01.0. You can migrate existing Docker Toolbox images with the scripts described below. (This migration cannot merge images from both Docker and Toolbox: any existing Docker image is replaced by the Toolbox images.) Run the following shell commands in a terminal.

You need a working qemu-img; it is part of the qemu package in both MacPorts and Brew.