k3s-upgrade

k3s-upgrade is an image that is responsible of upgrading k3s version via the System Upgrade Controller, it does that by doing the following:

• Replace the k3s binary with the new version
• Kill the old k3s process allowing the supervisor to restart k3s with the new version

Build

To build the k3s-upgrade image locally, you can run the following:

export ARCH=amd64 TAG=v1.17.2+k3s1
docker build --build-arg ARCH --build-arg TAG --tag ${REPO:=k3s-io}/k3s-upgrade:${TAG/+/-} .

Usage

Prerequisites

• K3s has to be installed using the install script using the curl command:

curl -sfL https://get.k3s.io | sh -

Example

1- To use the image with the system-upgrade-controller, you have first to run the controller either directly or deploy it on the k3s cluster:

kubectl apply -f https://raw.githubusercontent.com/rancher/system-upgrade-controller/master/manifests/system-upgrade-controller.yaml

You should see the upgrade controller starting in system-upgrade namespace.

2- Label the nodes you want to upgrade with the right label:

kubectl label node <node-name> k3s-upgrade=true

3- Run the upgrade plan in the k3s cluster

---
apiVersion: upgrade.cattle.io/v1
kind: Plan
metadata:
  name: k3s-latest
  namespace: system-upgrade
spec:
  concurrency: 1
  version: v1.17.2-k3s1
  nodeSelector:
    matchExpressions:
      - {key: k3s-upgrade, operator: Exists}
  serviceAccountName: system-upgrade
  drain:
    force: true
  upgrade:
    image: rancher/k3s-upgrade

The upgrade controller should watch for this plan and execute the upgrade on the labeled nodes. For more information about system-upgrade-controller and plan options please visit system-upgrade-controller official repo.

Contact

For bugs, questions, comments, corrections, suggestions, etc., open an issue in k3s-io/k3s with a title starting with [k3s-upgrade] .