kubeadm is the Kubernetes tool that helps you set up a Kubernetes cluster quickly and easily. kubeadm is different from other Kubernetes setup tools in that it doesn’t assume or depend on any special infrastructure. It assumes that you have one or more machine available and those machines can connect to each other via the network.
The master plan is to make kubeadm work both as the “fast path” to getting a best-practice Kubernetes cluster with a couple of easy-to-remember commands and as a toolbox for higher-level solutions like GKE, kops and Tectonic.
But how does kubeadm actually set up a cluster? How is it so easy to add a node with the Bootstrap Token? How does it self-host the control plane? How does it upgrade clusters smoothly with only one command? What is the plan for achieving HA without relying on any external infrastructure?
After this talk, you will be able to describe how:
- kubeadm runs the different tasks in different stages
- the network traffic between the cluster components flow
- self-hosting of the control plane works
- the Bootstrap Token works
- the `kubeadm upgrade` command works
- kubeadm will support multiple masters that are dynamically rotated
- you can extend kubeadm to build your higher-level Kubernetes deployment tool
