robbertkl/ssh repository overview

⁠robbertkl/ssh

Docker container running OpenSSH server:

• Exposes port 22
• Fills ~/.ssh/authorized_keys from an environment variable

⁠Usage

Run like this:

docker run -d -e AUTHORIZED_KEYS="..." -p 2222:22 robbertkl/ssh

You can then SSH with user root.

⁠Environment variables

• AUTHORIZED_KEYS (comma-separated list of SSH keys)

⁠Preserving host keys

Fresh host keys for OpenSSH are generated on first run. This is fine, but when later recreating the container (like after pulling a new image) they are generated again and you'll get an error trying to SSH because the old one is in your .ssh/known_hosts.

If you don't want to fix this every time after an upgrade, you can preserve the host keys in a number of ways:

• Keep /etc/ssh in a Docker volume (not recommended because you won't get sshd_config changes in new versions)
• Pregenerate host keys and mount them inside the container
• Pregenerate host keys, create your own Docker image using robbertkl/ssh as the base and copy in the host keys

⁠Authors

• Robbert Klarenbeek, [email protected]⁠

⁠License

This repo is published under the MIT License⁠.