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78 lines
2.4 KiB
Markdown
78 lines
2.4 KiB
Markdown
page_title: Dockerizing an SSH service
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page_description: Installing and running an SSHd service on Docker
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page_keywords: docker, example, package installation, networking
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# Dockerizing an SSH daemon service
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## Build an `eg_sshd` image
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The following `Dockerfile` sets up an SSHd service in a container that you
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can use to connect to and inspect other container's volumes, or to get
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quick access to a test container.
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# sshd
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#
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# VERSION 0.0.2
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FROM ubuntu:14.04
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MAINTAINER Sven Dowideit <SvenDowideit@docker.com>
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RUN apt-get update && apt-get install -y openssh-server
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RUN mkdir /var/run/sshd
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RUN echo 'root:screencast' | chpasswd
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RUN sed -i 's/PermitRootLogin without-password/PermitRootLogin yes/' /etc/ssh/sshd_config
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# SSH login fix. Otherwise user is kicked off after login
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RUN sed 's@session\s*required\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd
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ENV NOTVISIBLE "in users profile"
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RUN echo "export VISIBLE=now" >> /etc/profile
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EXPOSE 22
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CMD ["/usr/sbin/sshd", "-D"]
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Build the image using:
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$ docker build -t eg_sshd .
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## Run a `test_sshd` container
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Then run it. You can then use `docker port` to find out what host port
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the container's port 22 is mapped to:
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$ docker run -d -P --name test_sshd eg_sshd
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$ docker port test_sshd 22
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0.0.0.0:49154
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And now you can ssh as `root` on the container's IP address (you can find it
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with `docker inspect`) or on port `49154` of the Docker daemon's host IP address
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(`ip address` or `ifconfig` can tell you that) or `localhost` if on the
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Docker daemon host:
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$ ssh root@192.168.1.2 -p 49154
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# The password is ``screencast``.
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$$
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## Environment variables
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Using the `sshd` daemon to spawn shells makes it complicated to pass environment
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variables to the user's shell via the normal Docker mechanisms, as `sshd` scrubs
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the environment before it starts the shell.
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If you're setting values in the `Dockerfile` using `ENV`, you'll need to push them
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to a shell initialization file like the `/etc/profile` example in the `Dockerfile`
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above.
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If you need to pass`docker run -e ENV=value` values, you will need to write a
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short script to do the same before you start `sshd -D` and then replace the
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`CMD` with that script.
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## Clean up
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Finally, clean up after your test by stopping and removing the
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container, and then removing the image.
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$ docker stop test_sshd
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$ docker rm test_sshd
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$ docker rmi eg_sshd
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