Tutorial: Install a Highly Available K3s Cluster at the Edge

This is the last part of the tutorial in the K3s series. In the previous tutorial, we have seen how to set up a multinode etcd cluster. We will leverage the same infrastructure for setting up and configuring a highly available Kubernetes cluster based on K3s.

Kubernetes Clusters in High Availability Mode

The control plane of the Kubernetes cluster is mostly stateless. The only stateful component of the control plane is the etcd database, which acts as the single source of truth for the entire cluster. The API server acts as the gateway to the etcd database through which both internal and external consumers access and manipulate the state.

It is important that the etcd database is configured in HA mode to ensure that there is no single point of failure. There are two options for configuring the topology of a highly available (HA) Kubernetes clusters that depend on how etcd is setup.

Read the entire article at The New Stack

Janakiram MSV is an analyst, advisor, and architect. Follow him on Twitter,  Facebook and LinkedIn.