Shameless plug: https://www.juusohaavisto.com/microservices.html

To answer your question briefly: Kubernetes is hard to stay up-to-date, but it aims to improve later on. Kubernetes was largely created to solve problems scaling physical hardware -- I would not setup Kubernetes unless you run into a problem where you are growing out of dedicated host offerings thus need to update your apps across multiple such devices (easier options exist, look at LXC clustering). You need to define "reliable". If it is just your app or hardware crashing, you can probably get away with two dedicated computers in different colocations.