Build a Kubernetes Cluster from Scratch with kubeadm

What you will build

A working multi-node cluster that you understand all the way down.

Starting point: you only need a Vultr account. This challenge is self-contained, so you can do it without having done any other.

The plan

1. Deploy three Ubuntu instances in the same region on a private network
2. Install a container runtime and the Kubernetes packages on each
3. Initialise the control plane with kubeadm
4. Join both workers with the printed command
5. Install a network plugin and confirm nodes are Ready
6. Deploy an app with two replicas and expose it
7. Take an etcd snapshot and store it off the cluster
8. Drain a worker and confirm the app keeps running

sudo kubeadm init --pod-network-cidr=10.244.0.0/16
kubectl get nodes -o wide

How you will be judged

• Cluster ports are limited with firewall rules, not left open
• A restorable etcd backup exists
• An honest comparison with Vultr Kubernetes Engine

Destroy everything you created when you are done so you are not billed for it.