Dockerize an SSH service and use on windows

Build an ubuntu_sshd image on windows

Build the image

The following Dockerfile sets up an SSHd service in a container that you can use to connect to and inspect other container’s volumes, or to get quick access to a test container. Make the following substitutions:

• With RUN echo 'root:MyPassword' | chpasswd, replace “MyPassword” with the password you’ve previously generated.

FROM ubuntu:latest

RUN apt-get update && apt-get install -y openssh-server
RUN mkdir /var/run/sshd
RUN echo 'root:MyPassword' | chpasswd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config

# SSH login fix. Otherwise user is kicked off after login
RUN sed 's@session\s*required\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd

ENV NOTVISIBLE "in users profile"
RUN echo "export VISIBLE=now" >> /etc/profile

EXPOSE 22
CMD ["/usr/sbin/sshd", "-D"]

Build the image using:

$ docker build -t ubuntu_sshd .

Run a test_sshd container

Then run it. You can then use docker port to find out what host port the container’s port 22 is mapped to:

$ docker run -d -P --name test_sshd ubuntu_sshd
$ docker port test_sshd 22

0.0.0.0:49154

And now you can ssh as root on the container’s IP address (you can find it with docker inspect) or on port 49154 of the Docker daemon’s host IP address (ip address or ifconfig can tell you that) or localhost if on the Docker daemon host:

$ ssh root@192.168.1.2 -p 49154
# or
$ ssh root@localhost -p 49154
# The password is ``screencast``.
root@f38c87f2a42d:/#

Clean up

Finally, clean up after your test by stopping and removing the container, and then removing the image.

$ docker container stop test_sshd
$ docker container rm test_sshd
$ docker image rm ubuntu_sshd