![]() The BTRFS driver is described as experimental, and requires an existing BTRFS partition to be set up. Unfortunately Boot2Docker doesn’t yet integrate with Docker’s own port mapping mechanism, so it’s presently necessary to map ports in both VirtualBox and Docker in order to connect from the host Mac to services running inside containers. ![]() The DOCKER_HOST environment variable is used so that the client can connect to a Docker daemon on TCP rather than the default native Unix socket. Boot2Docker provides lifecycle management, and also takes care of port mappings for SSH and the Docker daemon running in the VM. Boot2Docker provides a minimal linux environment, and a set of command line scripts to work with VirtualBox. The Docker team have a stated desire to port Linux containers ( LXC) and other dependencies to OS X, but for now their daemon must run in a VM. Prior to this release Mac users would have to run both the Docker client and daemon in a Linux virtual machine. ![]() Mac support consists of a native Docker OS X client, and a lightweight Boot2Docker virtual machine (VM) that must run in VirtualBox (as OS X doesn’t have the underlying support for Linux containers required by Docker). As part of the 0.8 release the Docker.io team have announced support for installation on Mac OS X and the use of the BTRFS as an alternative to AUFS.
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