website/content/en/docs/tasks/administer-cluster/kubeadm/upgrading-windows-nodes.md

title	min-kubernetes-server-version	content_template	weight
Upgrading Windows nodes	1.17	templates/task	40

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This page explains how to upgrade a Windows node created with kubeadm.

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• Familiarize yourself with the process for upgrading the rest of your kubeadm cluster. You will want to upgrade the control plane nodes before upgrading your Windows nodes.

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Upgrading worker nodes

Upgrade kubeadm

1. From the Windows node, upgrade kubeadm:

   # replace {{< param "fullversion" >}} with your desired version
   curl.exe -Lo C:\k\kubeadm.exe https://dl.k8s.io/{{< param "fullversion" >}}/bin/windows/amd64/kubeadm.exe
   

Drain the node

1. From a machine with access to the Kubernetes API, prepare the node for maintenance by marking it unschedulable and evicting the workloads:

   # replace <node-to-drain> with the name of your node you are draining
   kubectl drain <node-to-drain> --ignore-daemonsets
   

   You should see output similar to this:

   node/ip-172-31-85-18 cordoned
   node/ip-172-31-85-18 drained
   

Upgrade the kubelet configuration

1. From the Windows node, call the following command to sync new kubelet configuration:

   kubeadm upgrade node
   

Upgrade kubelet

1. From the Windows node, upgrade and restart the kubelet:

   stop-service kubelet
   curl.exe -Lo C:\k\kubelet.exe https://dl.k8s.io/{{< param "fullversion" >}}/bin/windows/amd64/kubelet.exe
   restart-service kubelet
   

Uncordon the node

1. From a machine with access to the Kubernetes API, bring the node back online by marking it schedulable:

   # replace <node-to-drain> with the name of your node
   kubectl uncordon <node-to-drain>
   

Upgrade kube-proxy

1. From a machine with access to the Kubernetes API, run the following, again replacing {{< param "fullversion" >}} with your desired version:

   curl -L https://github.com/kubernetes-sigs/sig-windows-tools/releases/latest/download/kube-proxy.yml | sed 's/VERSION/{{< param "fullversion" >}}/g' | kubectl apply -f -
   

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