Upgrade

Command line

You can also use the rancherd upgrade command on a server node to automatically upgrade RancherOS, Rancher, and/or Kubernetes.

Kubernetes API

All components in RancherOS are managed using Kubernetes. Below is how to use Kubernetes approaches to upgrade the components.

RancherOS

RancherOS is upgraded with the RancherOS operator. Refer to the RancherOS Operator documentation for complete information, but the TL;DR is

kubectl edit -n fleet-local defautl-os-image

apiVersion: rancheros.cattle.io/v1
kind: ManagedOSImage
metadata:
  name: default-os-image
  namespace: fleet-local
spec:
  # Set to the new RancherOS version you would like to upgrade to
  osImage: rancher/os2:v0.0.0

rancherd

Rancherd itself doesn't need to be upgraded. It is only ran once per node to bootstrap the system and then after that provides no value. Rancherd is packaged in the OS image so newer versions of Rancherd will come with newer versions of RancherOS.

Rancher

Rancher is installed as a helm chart following the standard procedure. You can upgrade Rancher with the standard procedure documented at https://rancher.com/docs/rancher/v2.6/en/installation/install-rancher-on-k8s/upgrades/.

Kubernetes

To upgrade Kubernetes you will use Rancher to orchestrate the upgrade. This is a matter of changing the Kubernetes version on the fleet-local/local Cluster in the provisioning.cattle.io/v1 apiVersion. For example

kubectl edit clusters.provisioning.cattle.io -n fleet-local local

apiVersion: provisioning.cattle.io/v1
kind: Cluster
metadata:
  name: local
  namespace: fleet-local
spec:
  # Change to new valid k8s version, >= 1.21
  # Valid versions are
  # k3s: curl -sL https://raw.githubusercontent.com/rancher/kontainer-driver-metadata/release-v2.6/data/data.json | jq -r '.k3s.releases[].version'
  # RKE2: curl -sL https://raw.githubusercontent.com/rancher/kontainer-driver-metadata/release-v2.6/data/data.json | jq -r '.rke2.releases[].version'
  kubernetesVersion: v1.21.4+k3s1

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