docker save -o
docker load -i
https://www.sep.com/sep-blog/2017/02/28/load-balancing-with-nginx-and-docker/
docker-compose up -d --scale webapp=4
sudo docker ps -a | grep Exit | cut -d ' ' -f 1 | xargs sudo docker rm
docker images -a | awk '{print $3}' | xargs docker rmi
docker system prune -a
"No file" when downloading CSV on chrome NiginX sticky cookie https://groups.google.com/forum/#!topic/shiny-discuss/QajiYiFwsIY
https://www.nginx.com/products/nginx/load-balancing/
https://calligross.de/post/using-cookie-based-authentication-with-shiny/ cookie based sticky session is required https://support.rstudio.com/hc/en-us/articles/213733868-Running-Shiny-Server-with-a-Proxy http://nginx.org/en/docs/http/load_balancing.html