ubuntu-sshd-cron

Schedule regular tasks that require ssh connection for copying files over to the container. Build on top of official Ubuntu image.

DISCLAIMER: Please note that this is for specific use case and not for stable production use.

Installed packages

Base:

• Bionic (18.04) minimal

Image specific:

• openssh-server
• rsync
• cron

Config:

• default command: cron -f

Example setup

Using Host-Based Authentication:

This expects that you have already setup Host-Based Authentication on your target server. Refer to https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Host-based_Authentication for setting up host-based authentication.

• generate private and public key pair for your client

  ssh-keygen -t rsa -C "server comment field"

• create and populate known_hosts file with target host public key

  ssh-keyscan target.example.com | tee -a known_hosts

• create config file for client ssh (refer to ssh-config)

  Host target
      HostName target.example.com
      Port 22
      User username
      HostbasedAuthentication yes
      EnableSSHKeysign yes

• Populate target server with client's public key

• start the container and add the ssh files as a volume

  docker run -it --rm \
  -v "/path_to_ssh_settings:/tmp/.ssh:ro" \
  -v "/my_data_drive:/data:rw" \
  -v "/path_to_script:/etc/cron.daily/script \
  urbanobservatory/ubuntu-sshd-cron

  or

  datacopy:
    image: urbanobservatory/ubuntu-sshd-cron
    restart: unless-stopped
    volumes:
      - ./path_to_ssh_settings:/tmp/.ssh:ro
      - ./my_data_drive:/data:rw
      - ./script.sh:/etc/cron.daily/script