Spinning up and down hard drives repeatedly drastically reduces their lifespan though. Once a day or so, fine, but if you set a 30 minute idle time or something and it spins them down a dozen times per day, you are putting acceleration forces on the drive many more times than intended.
If you have to buy a new HDD twice as often because you spin it down, any financial or environmental savings is instantly negated and in the end it is much, much worse in both respects.
I started using Dockhand for container administration. It is pretty new, but works well.
You can view container logs, update/restart containers, and run a terminal inside of the containers, but not the host system.
You can create a new socket proxy just for the containers that you want to give them access to maybe.