How do I SSH into the boot2docker host vm that the Vagrant 1.6 Docker Provider sets up?

Vagrant's boot2docker keeps boot2docker's ssh username and password.

SSH into VM

$ 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: dockerpass: tcuser

https://github.com/boot2docker/boot2docker#ssh-into-vm

The port is forwarded from the local port 2022 by default. You can verify this:

$ VBoxManage list vms | grep docker"docker-host_default_1234567890000_1234" {3d66ecf6-4539-47ca-afd2-66f953cd9a3e}$ VBoxManage showvminfo docker-host_default_1234567890000_1234 | grep sshNIC 1 Rule(1):   name = ssh, protocol = tcp, host ip = 127.0.0.1, host port = 2022, guest ip = , guest port = 22

And then login:

$ ssh docker@localhost -p 2022docker@localhost's password: tcuser                        ##        .                  ## ## ##       ==               ## ## ## ##      ===           /""""""""""""""""\___/ ===      ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~           \______ o          __/             \    \        __/              \____\______/ _                 _   ____     _            _| |__   ___   ___ | |_|___ \ __| | ___   ___| | _____ _ __| '_ \ / _ \ / _ \| __| __) / _` |/ _ \ / __| |/ / _ \ '__|| |_) | (_) | (_) | |_ / __/ (_| | (_) | (__|   <  __/ ||_.__/ \___/ \___/ \__|_____\__,_|\___/ \___|_|\_\___|_|boot2docker: 0.8.0docker@boot2docker:~$ 

Oct 2015: Boot2docker is deprecated in favor of docker-machine. To login:

$ docker-machine lsNAME      ACTIVE   DRIVER       STATE     URL                         SWARMdefault   *        virtualbox   Running   tcp://192.168.99.100:2376   $ docker-machine ssh default

You can ssh into docker host with vagrant ssh docker-host-id but first you need to know the docker-host-id.
You can get a list of all active Vagrant environments with vagrant global-status command.
To get the docker-host id you can filter with grep:

vagrant global-status | grep docker-host

you'll obtain an output similar to:

68f58d0  default  virtualbox running   /Users/yourUser/.vagrant.d/data/docker-host

copy the first column id, and then ssh into docker-host:

vagrant ssh 68f58d0

vagrant global status docs