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03-etcd.md

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Bootstrapping a H/A etcd cluster

In this lab you will bootstrap a 3 node etcd cluster.

Why

All Kubernetes components are stateless which greatly simplifies managing a Kubernetes cluster. All state is stored in etcd, which is a database and must be treated special. etcd is being run on a dedicated set of machines for the following reasons:

  • The etcd lifecycle is not tied to Kubernetes. We should be able to upgrade etcd independently of Kubernetes.
  • Scaling out etcd is different than scaling out the Kubernetes Control Plane.
  • Prevent other applications from taking up resources (CPU, Memory, I/O) required by etcd.

Provision the etcd Cluster

$ ansible-playbook 03-etcd.yml