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Deploy a Docker container with SSH access

Prepare Dockerfile, image, container and IP address

  1. Dockerfile
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FROM ubuntu:22.10

RUN apt update && apt install -y openssh-server nano

RUN mkdir /var/run/sshd

# [email protected] is root password
RUN echo 'root:[email protected]' | chpasswd

RUN sed -i 's/PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config

RUN sed '[email protected]\s*required\s*[email protected] optional [email protected]' -i /etc/pam.d/sshd

EXPOSE 22

CMD ["/usr/sbin/sshd", "-D"]
  1. Build the image and deploy the container
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docker build -t sshd_ubuntu .
docker run -d -P --name test_sshd sshd_ubuntu
  1. Locate the IP address of the running container
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docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' test_sshd

// ex output: 172.17.0.2

SSH into the running container (using password)

  1. Tune SSH Daemon Configuration
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// docker exec -it <container_id> bash
docker exec -it test_sshd bash
nano /etc/ssh/sshd_config
  • In that file (sshd_config), uncomment the line:
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#PermitRootLogin yes
  • That line should look like this:
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PermitRootLogin yes
  • Restart the SSH daemon:
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service ssh restart
docker restart test_sshd
  1. SSH into the container

Using the root’s password: [email protected]

SSH into the running container (using SSH key)

  • Create a RSA Key Pair
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ssh-keygen -t rsa
  • Add id_rsa.pub to remote server (docker container)
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cat ~/.ssh/id_rsa.pub | ssh [email protected] "mkdir -p ~/.ssh && chmod 700 ~/.ssh && cat >>  ~/.ssh/authorized_keys"

References

This post is licensed under CC BY 4.0 by the author.

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