Kubernetes cluster is hard to operate indeed. Techniques that we always had to deploy before Kubernetes, for example package managers, don't always translate to

Kubernetes cluster is hard to operate indeed. Techniques that we always had to deploy before Kubernetes, for example package managers, don't always translate to operating a distributed system on a hundreds or thousands of servers. Some of this complexity is definitely incidental, not all components are not always coordinating well with each other, e.g. docker and API server, networking layer during upgrades for example. On the other hand lots of this complexity is essential - K8s is a distributed system with database, network and container orchestration layer solving a hard problem.