This Docker image provides an Ubuntu 24.04 base with SSH server enabled. It allows you to easily create SSH-accessible containers via SSH keys or with a default username and password.

Usage

Cloning the Repository

To get started, clone the GitHub repository containing the Dockerfile and scripts:

git clone https://github.com/aoudiamoncef/ubuntu-sshd
cd ubuntu-sshd

Building the Docker Image

Build the Docker image from within the cloned repository directory:

docker build -t my-ubuntu-sshd:latest .

Running a Container

To run a container based on the image, use the following command:

docker run -d \
  -p host-port:22 \
  -e SSH_USERNAME=myuser \
  -e SSH_PASSWORD=mysecretpassword \
  -e AUTHORIZED_KEYS="$(cat path/to/authorized_keys_file)" \
  -e SSHD_CONFIG_ADDITIONAL="your_additional_config" \
  -e SSHD_CONFIG_FILE="/path/to/your/sshd_config_file" \
  my-ubuntu-sshd:latest

• -d runs the container in detached mode.
• -p host-port:22 maps a host port to port 22 in the container. Replace host-port with your desired port.
• -e SSH_USERNAME=myuser sets the SSH username in the container. Replace myuser with your desired username.
• -e SSH_PASSWORD=mysecretpassword sets the SSH user's password in the container. This environment variable is required. Replace mysecretpassword with your desired password.
• -e AUTHORIZED_KEYS="$(cat path/to/authorized_keys_file)" sets authorized SSH keys in the container. Replace path/to/authorized_keys_file with the path to your authorized_keys file.
• -e SSHD_CONFIG_ADDITIONAL="your_additional_config" allows you to pass additional SSHD configuration. Replace your_additional_config with your desired configuration.
• -e SSHD_CONFIG_FILE="/path/to/your/sshd_config_file" allows you to specify a file containing additional SSHD configuration. Replace /path/to/your/sshd_config_file with the path to your configuration file.
• my-ubuntu-sshd:latest should be replaced with your Docker image's name and tag.

SSH Access

Once the container is running, you can SSH into it using the following command:

ssh -p host-port myuser@localhost

• host-port should match the port you specified when running the container.
• Use the provided password or SSH key for authentication, depending on your configuration.

Note

• If the AUTHORIZED_KEYS environment variable is empty when starting the container, it will still launch the SSH server, but no authorized keys will be configured. You have to mount your own authorized keys file or manually configure the keys in the container.
• If AUTHORIZED_KEYS is provided, password authentication will be disabled for enhanced security.

License

This Docker image is provided under the MIT License.