As stated in these docs: https://rancher.com/docs/rancher/v2.5/en/installation/install-rancher-on-k8s/upgrades/#option-a-upgrading-rancher
sudo snap install helm --classic
Upgrade it:
# To have the same values:
helm get values rancher -n cattle-system -o yaml > rancher_values.yaml
# Add the repo
helm repo add rancher-stable https://releases.rancher.com/server-charts/stable
helm repo update
helm fetch rancher-stable/rancher
helm upgrade rancher rancher-stable/rancher \
--namespace cattle-system \
-f rancher_values.yaml \
--version=2.6.5
If helm upgrade doesn't work we need to delete the rancher and reinstall it, following these steps without the cert-manager:
helm delete rancher -n cattle-system
helm install rancher rancher-stable/rancher \
--namespace cattle-system \
-f rancher_values.yaml \
--version=2.6.5
It should reuse the old configs and so.
Check the pods and logs:
kubectl get pods --namespace cattle-system
kubectl -n cattle-system rollout status deploy/rancher
kubectl logs -f rancher-84696c75d9-62mk4 --namespace cattle-system
# Should check the version
2022/07/01 08:49:27 [INFO] Rancher version v2.6.5 (c4d59fa88) is starting