Upgrade cluster

Introduction

This Article explains how to upgrade Kubernetes Cluster managed by MicroK8.

Requirements

• Root access to all Cluster Nodes

Before you go

Instructions

To upgrade Kubernetes cluster follow steps below:

1. Get nodes list:

   kubectl get nodes

2. Drain one node:

   kubectl drain <node> --ignore-daemonsets --delete-local-data

3. SSH on drained node:

   ssh <node>

4. Run node upgrade with command below and wait until it’s done:

   sudo snap refresh microk8s --channel <version>/stable

5. Verify node on node list (it should be in Ready status before going to next step):

   kubectl get nodes

6. Uncordon node to allow schedule pods on it:

   kubectl uncordon <node>