Setup: High Availability and High Performance Kubernetes Cluster

Operating System: Ubuntu 20.04LTS

Hosts or VM's needed/specs:

2x Load Balancers: 2 CPU Cores, 2GB Memory, 100GB disk
3x Master & 3x Workers: 4 CPU Cores, 4GB Memory, 300GB disk

Additional VM requirements for i.e. static storage is not included in these instructions.

Description

Setting up a high availability and high performance Kubernetes cluster can be a confusing and daunting task. There is a mountain of documentation available, but the development cycle is fast paced and quickly gets outdated.

So these instructions are written as a step-by-step list with some assistance in what to install and how to install it.

The prerequisite is that you have some experience in Linux and that you already understand what you are trying to achieve. If you do that, and install according to instructions - you should have a Kubernetes cluster up and running in 30-90 minutes (most of the time spent installing Ubuntu and upgrades).

Firewall: Port requirements

Protocol    Direction	Port Range	Purpose                 Used By
TCP         Inbound	6443*           Kubernetes API server	All
TCP         Inbound	2379-2380	etcd server client API	kube-apiserver, etcd
TCP         Inbound	10250           kubelet API             Self, Control plane
TCP         Inbound	10251           kube-scheduler          Self
TCP         Inbound	10252           kube-controller-manager	Self

Worker node(s)
Protocol    Direction	Port Range	Purpose                 Used By
TCP         Inbound	10250           kubelet API             Self, Control plane
TCP         Inbound	30000-32767     NodePort Services†      All

Kubernetes high-availability and high-performance architecture

Work the right and effortless way!

LENS - The Kubernetes IDE

Windows Terminal

If you are working on Windows 10, I'd recommend installing a Linux subsystem and the new Windows Terminal (with Panes) so you can work easier with all the hosts up at the same time.