===
- https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-20-04
- read second half of article for common allowed ports https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands
- passwordless ssh https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys-on-ubuntu-20-04
- install docker, post installation: no sudo, configure log size limit, in client machine, setup context that points to remote docker
- setup traefik as router for other docker apps https://www.digitalocean.com/community/tutorials/how-to-use-traefik-v2-as-a-reverse-proxy-for-docker-containers-on-ubuntu-20-04