Boot2Docker is a lightweight Linux distribution made specifically to run [Docker] (https://www.docker.io/) containers. It runs completely from RAM, is a small ~24MB download and boots in ~5s (YMMV).
Installation instructions for OS X and Windows available on the Docker documentation site.
- Kernel 3.14.1 with AUFS, Docker 1.0.0 - using libcontainer
- Container persistence via disk automount on
/var/lib/docker - SSH keys persistence via disk automount
Note: This version of Docker uses port 2375, the newly registered IANA port
We have built installers for OS X and MS Windows which will install the boot2docker management tool, VirtualBox and any tools needed to run Boot2Docker.
If you have the prerequisites, or want to help develop Boot2Docker, you can
also download the appropriate boot2docker management release and use it to download
the boot2docker.iso.
The boot2docker managment tool leverages VirtualBox's VBoxManage to
initialise, start, stop and delete the VM right from the command line.
$ boot2docker init
$ boot2docker up
$ boot2docker stop
$ boot2docker download
$ boot2docker up
If your Boot2Docker virtual machine was created prior to 0.11.1-pre1, its best to
delete - boot2docker delete and then boot2docker init to create a new VM.
The main changes are to add a /var/lib/boot2docker/userdata.tar file that is
un-tarred into the /home/docker directory on boot. This file contains a
.ssh/authorized_keys and .ssh/authorized_keys2 files containing a public sshkey.
See Frequently asked questions for more details.
The latest version of boot2docker sets up two network adaptors, one using NAT
to allow the VM to download images and files from the internet, and a host only
network that Docker container's ports will be exposed on.
If you run a container with an exposed port:
$ docker run --rm -i -t -p 80:80 apache
Then you should be able to access that apache server using the IP address reported to you using:
$ boot2docker ip
192.168.59.103
Typically, it is 192.168.59.103, but it can change as its dynamically allocated by the VirtualBox DHCP server.
If you want to share container ports with other computers on your LAN, you will need to set up NAT adaptor based port forwarding
Boot2Docker is essentially a remote Docker engine with a read only filesystem (other than Docker images, containers and volumes). The most scalable and portable way to share disk space between your local desktop and a Docker container is by creating a volume container and then sharing that to where it's needed.
One well tested approach is to use a file sharing container like svendowideit/samba
e.g:
# Make a volume container
$ docker run -v /data --name my-data busybox true
# Share it using Samba (Windows file sharing)
$ docker run --rm -v /usr/local/bin/docker:/docker -v /var/run/docker.sock:/docker.sock svendowideit/samba my-data
# then find out the IP address of your Boot2Docker host
$ boot2docker ip
192.168.59.103
Connect to the shared folder using Finder (OS X):
Connect to cifs://192.168.59.103/data
Or on Windows, use Explorer to Connect to:
\\192.168.59.103\data
The boot2docker management tool allows you to customise many options from both the
commandline, or by setting them in its configuration file.
see boot2docker config for more (including the format of the configuration file).
$ boot2docker ssh
Boot2Docker auto logs in using the generated SSH key, but if you want to SSH into
the machine manually (or you're not using a boot2docker managed VM), the credentials are:
user: docker
pass: tcuser
When you run boot2docker init, the boot2docker tool auto-creates
a disk that will be automounted and used to persist your docker data in
/var/lib/docker and /var/lib/boot2docker.
This virtual disk will be removed when you run boot2docker delete.
It will also persist the SSH keys of the machine.
If you are not using the boot2docker VirtualBox manage tool, you can create
an ext4 or btrfs formatted partition with the label boot2docker-data
(mkfs.ext4 -L boot2docker-data /dev/sdX5) to your VM or host, and
boot2docker will automount it on /mnt/sdX and then softlink
/mnt/sdX/var/lib/docker to /var/lib/docker.
To 'install' the ISO onto an SD card, USB-Stick or even empty hard disk, you can
use dd if=boot2docker.iso of=/dev/sdX.
This will create the small boot partition, and install an MBR.
Goto How to build for Documentation on how to build your own boot2docker ISOs.
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