Written in Node.js, this application acts as a HTTP reverse proxy and stops Docker containers which haven't been accessed recently and starts them again when a new request comes in. ContainerNursery also makes sure there are no more active WebSocket connections before stopping the container.

To improve the user experience a loading page is presented, which automatically reloads when the containers webserver is ready.

via https://korben.info/containernursery-mise-veille-conteneurs-docker.html