Minimum hardware requirement to run Docker

I am playing with podman on Banana Pi Zero M2 and P2 with 512MB RAM without issues, I suppose with docker it will be the same - so no problem, but if for example you will be using Photoview for photo library - it eats up all CPU and seems struggling very hard =) Also when k8s comes in, to create cluster with 1 node is more or less ok, but when 2 nodes it starts to be problem, but anyway depends on load you put in