DEPRECATED; see https://github.com/boot2docker/boot2docker/pull/1408
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Boot2Docker is officially deprecated and unmaintained. It is recommended that users transition from Boot2Docker over to Docker Desktop instead (especially with the new WSL2 backend, which supports Windows 10 Home).
These days there are a lot of tools designed to help spin up environments, and it's relatively easy to get something up and running with Docker installed with minimal effort.
Boot2Docker is a lightweight Linux distribution made specifically to run Docker containers. It runs completely from RAM, is a ~45MB download and boots quickly.
Note: Boot2Docker uses port 2376, the registered IANA Docker TLS port
Boot2Docker is designed and tuned for development. Using it for any kind of production workloads is highly discouraged.
Boot2Docker is used via Docker Machine (installed as part of Docker Toolbox) which leverages VirtualBox's
VBoxManageto initialise, start, stop and delete the VM right from the command line.
See Frequently asked questions for more details.
The bootup script output is logged to
/boot.log, so you can see (and potentially debug) what happens. Note that this is not persistent between boots because we're logging from before the persistence partition is mounted (and it may not exist at all).
If you need to customize the options used to start the Docker daemon, you can do so by adding entries to the
/var/lib/boot2docker/profilefile on the persistent partition inside the Boot2Docker virtual machine. Then restart the daemon.
The following example will enable core dumps inside containers, but you can specify any other options you may need.
docker-machine ssh default -t sudo vi /var/lib/boot2docker/profile # Add something like: # EXTRA_ARGS="--default-ulimit core=-1" docker-machine restart default
As discussed in the Docker Engine documentation certificates should be placed at
hostnameis your Registry server's hostname.
docker-machine scp certfile default:ca.crt docker-machine ssh default sudo mv ~/ca.crt /etc/docker/certs.d/hostname/ca.crt exit docker-machine restart
Alternatively the older Boot2Docker method can be used and you can add your Registry server's public certificate (in
.crtformat) into the
/var/lib/boot2docker/certs/directory, and Boot2Docker will automatically load it from the persistence partition at boot.
You may need to add several certificates (as separate
.crtfiles) to this directory, depending on the CA signing chain used for your certificate.
As of Docker version 1.3.1, if your registry doesn't support HTTPS, you must add it as an insecure registry.
$ docker-machine ssh default "echo $'EXTRA_ARGS=\"--insecure-registry \"' | sudo tee -a /var/lib/boot2docker/profile && sudo /etc/init.d/docker restart"
then you should be able to do a docker push/pull.
So sometimes if you are behind a VPN, you'll get an
i/o timeouterror. The current work around is to forward the port in the boot2docker-vm.
If you get an error like the following:
Sending build context to Docker daemon 2014/11/19 13:53:33 Post https://192.168.59.103:2376/v1.15/build?rm=1&t=your-tag: dial tcp 192.168.59.103:2376: i/o timeout
That means you have to forward port
2376, which can be done like so:
$ docker-machine ssh default
Docker Machine auto logs in using the generated SSH key, but if you want to SSH into the machine manually (or you're not using a Docker Machine managed VM), the credentials are:
user: docker pass: tcuser
Boot2docker uses Tiny Core Linux, which runs from RAM and so does not persist filesystem changes by default.
When you run
docker-machine, the tool auto-creates a disk that will be automounted and used to persist your docker data in
/var/lib/boot2docker. This virtual disk will be removed when you run
docker-machine delete default. It will also persist the SSH keys of the machine. Changes outside of these directories will be lost after powering down or restarting the VM.
If you are not using the Docker Machine management tool, you can create an
ext4formatted partition with the label
mkfs.ext4 -L boot2docker-data /dev/sdX5) to your VM or host, and Boot2Docker will automount it on
/mnt/sdXand then softlink