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SSH-based container access pattern

The SSH-based container access pattern involves creating a Docker container environment that allows remote access and management via the Secure Shell (SSH) protocol^[600-developer-docker-dockerfile-docker-ssh.md]. This pattern transforms a container into a potentially persistent, interactive workspace by installing an SSH server within it.

Implementation Details

To implement this pattern, a Dockerfile must include instructions to install the necessary OpenSSH server packages and configure the runtime environment^[600-developer-docker-dockerfile-docker-ssh.md]. A typical implementation requires the following steps:

  1. Base Image: Selecting a base operating system image (e.g., Java 8)^[600-developer-docker-dockerfile-docker-ssh.md].
  2. Package Installation: Using a package manager (like apt-get) to install openssh-server^[600-developer-docker-dockerfile-docker-ssh.md].
  3. Directory Setup: Creating required runtime directories for the SSH daemon, such as /var/run/sshd and /root/.ssh^[600-developer-docker-dockerfile-docker-ssh.md].
  4. System Configuration: Modifying system files, specifically relaxing PAM (Pluggable Authentication Modules) restrictions by commenting out pam_loginuid.so in the SSH configuration file^[600-developer-docker-dockerfile-docker-ssh.md].
  5. Access Configuration: copying authorized keys or password configurations into the container to allow authentication^[600-developer-docker-dockerfile-docker-ssh.md].

Configuration and Runtime

Once the environment is prepared, the container must expose the standard SSH port, typically port 22^[600-developer-docker-dockerfile-docker-ssh.md]. The lifecycle of the container is managed by a startup script (often copied into the image as run.sh) which initializes the SSH daemon to listen for incoming connections^[600-developer-docker-dockerfile-docker-ssh.md].

Sources

  • 600-developer-docker-dockerfile-docker-ssh.md