https://nginx.org/en/docs/http/ngx_http_proxy_module.html
https://docs.nginx.com/nginx/admin-guide/web-server/reverse-proxy/

2021
https://linuxiac.com/reverse-proxy-with-nginx/
https://linuxhandbook.com/nginx-reverse-proxy-docker/
2020
https://linuxhandbook.com/update-docker-container-zero-downtime/