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FAQ

What are the specs of the VM?

  • CPU Cores: same as host (physical, not logical)
  • 40gb HDD (auto-initialized at first boot)
  • 2GB memory
  • Autoboots to Boot2Docker
  • virtio high performance networking
  • NAT networked (Docker 2375->2375 and SSH 22->2022 are forwarded to the host)

How can I solve my problems with SSH?

If ssh complains about the keys:

$ ssh-keygen -R '[localhost]:2022'

Login as root

Run sudo -s as the docker user.

What is the Boot2Docker distribution based on?

It is based on a stripped down Tiny Core Linux.

Why not CoreOS?

I got asked that question a lot, so I thought I should put it here once and for all. CoreOS is targeted at building infrastructure and distributed systems. I just wanted the fastest way to boot to Docker.

Persistent partition choice

Boot2Docker will first try to mount a partition labeled boot2docker-data, if that doesn't exist, it will pick the first ext4 partition listed by blkid.

Local Customisation (with persistent partition)

From Boot2Docker version 1.6.0, the /var/lib/boot2docker/bootsync.sh script is run before the Docker daemon is started.

If you have a persistence partition, you can make customisations that are run at the end of the boot initialisation in the /var/lib/boot2docker/bootlocal.sh file.

You can also set variables that will be used during the boot initialisation (after the automount) by setting them in /var/lib/boot2docker/profile

For example, to download pipework, install its pre-requisites (which you can download using tce-load -w package.tcz), and then start a container:

#!/bin/sh


if [ ! -e /var/lib/boot2docker/pipework ]; then
        curl -o /var/lib/boot2docker/pipework https://raw.github.com/jpetazzo/pipework/master/pipework
        chmod 777 /var/lib/boot2docker/pipework
fi

#need ftp://ftp.nl.netbsd.org/vol/2/metalab/distributions/tinycorelinux/4.x/x86/tcz/bridge-utils.tcz
#and iproute2 (and its friends)
su - docker -c "tce-load -i /var/lib/boot2docker/*.tcz"

#start my management container if its not already there
docker run -d -v /var/run/docker.sock:/var/run/docker.sock $(which docker):$(which docker)  -name dom0 svens-dom0

Or, if you need to tell the Docker daemon to use a specific DNS server, add the following to /var/lib/boot2docker/profile:

EXTRA_ARGS="--dns 192.168.1.2"

What is the development process

We are implementing the same process as Docker merge approval, so all commits need to be done via pull requests, and will need 2 or more LGTMs.

Is boot2docker only for VirtualBox?

There are two parts of Boot2Docker: the ISO image, and the boot2docker management tool to set up and mange a VM. The management tool only works with VirtualBox, but the ISO image is designed to also be used with physical hardware. There are no plans to make separate ISO images for different configurations.