running docker on a raspberry pi

And in my case, using docker solely for pihole. It's as if my "shipping container" has nothing inside save for a box of kleenex.

You jest, but I’m currently running 13 containers on one of my Pi’s and using ~34% of the RAM.

IMO containers should be fairly small. If they’re too large, it’s probably time to look into breaking up that app into micro-services.