I use docker on OSX with boot2docker.
I want to get an Ssh connection from my terminal into a running container.
But I can't do this :(
I think it's because Docker is running in a virtual machine.
There are several things you must do to enable ssh'ing to a container running in a VM:
sshd
in your container (example). sshd
is not there by default because containers typically run only one process, though they can run as many as you like.EXPOSE
a port as part of creating the image, typically 22, so that when you run the container, the daemon connects to the EXPOSE
'd port inside the container and something can be exposed on the outside of the container.docker run -p 42222:22 ...
which maps port 42222 on the VM to port 22 in the container.VBoxManage modifyvm "boot2docker-vm" --natpf1 "containerssh,tcp,,42222,,42222"
Then from your host, you should be able to ssh to port 42222 on the host to reach the container's ssh daemon.
Here's what happens when I perform the above steps:
$ VBoxManage modifyvm "boot2docker-vm" --natpf1 "containerssh,tcp,,42222,,42222"
$ ./boot2docker start
[2014-04-11 12:07:35] Starting boot2docker-vm...
[2014-04-11 12:07:55] Started.
$ docker run -d -p 42222:22 dhrp/sshd
Unable to find image 'dhrp/sshd' (tag: latest) locally
Pulling repository dhrp/sshd
2bbfe079a942: Download complete
c8a2228805bc: Download complete
8dbd9e392a96: Download complete
11d214c1b26a: Download complete
27cf78414709: Download complete
b750fe79269d: Download complete
cf7e766468fc: Download complete
082189640622: Download complete
fa822d12ee30: Download complete
1522e919ec9f: Download complete
fa594d99163a: Download complete
1bd442970c79: Download complete
0fda9de88c63: Download complete
86e22a5fdce6: Download complete
79d05cb13124: Download complete
ac72e4b531bc: Download complete
26e4b94e5a13b4bb924ef57548bb17ba03444ca003128092b5fbe344110f2e4c
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
26e4b94e5a13 dhrp/sshd:latest /usr/sbin/sshd -D 6 seconds ago Up 3 seconds 0.0.0.0:42222->22/tcp loving_einstein
$ ssh root@localhost -p 42222
The authenticity of host '[localhost]:42222 ([127.0.0.1]:42222)' can't be established.
RSA key fingerprint is ....
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[localhost]:42222' (RSA) to the list of known hosts.
root@localhost's password: screencast
Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.12.1-tinycore64 x86_64)
* Documentation: https://help.ubuntu.com/
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.
root@26e4b94e5a13:~# exit
logout
So that shows ssh->localhost 42222->VM port 42222->container port 22.