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

title	content_type	weight
Upgrading Linux nodes	task	100

This page explains how to upgrade a Linux Worker Nodes created with kubeadm.

{{% heading "prerequisites" %}}

{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}

• 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 Linux Worker nodes.

Changing the package repository

If you're using the Kubernetes community-owned repositories, you need to change the package repository to one that contains packages for your desired Kubernetes minor version. This is explained in Changing the Kubernetes package repository document.

Upgrading worker nodes

Upgrade kubeadm

Upgrade kubeadm:

{{< tabs name="k8s_install_kubeadm_worker_nodes" >}} {{% tab name="Ubuntu, Debian or HypriotOS" %}}

# replace x in {{< skew currentVersion >}}.x-* with the latest patch version
apt-mark unhold kubeadm && \
apt-get update && apt-get install -y kubeadm='{{< skew currentVersion >}}.x-*' && \
apt-mark hold kubeadm

{{% /tab %}} {{% tab name="CentOS, RHEL or Fedora" %}}

# replace x in {{< skew currentVersion >}}.x- with the latest patch version
yum install -y kubeadm-'{{< skew currentVersion >}}.x-*' --disableexcludes=kubernetes

{{% /tab %}} {{< /tabs >}}

Call "kubeadm upgrade"

For worker nodes this upgrades the local kubelet configuration:

sudo kubeadm upgrade node

Drain the node

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

Upgrade kubelet and kubectl

1. Upgrade the kubelet and kubectl:

   {{< tabs name="k8s_kubelet_and_kubectl" >}} {{% tab name="Ubuntu, Debian or HypriotOS" %}}

   # replace x in {{< skew currentVersion >}}.x-* with the latest patch version
   apt-mark unhold kubelet kubectl && \
   apt-get update && apt-get install -y kubelet='{{< skew currentVersion >}}.x-*' kubectl='{{< skew currentVersion >}}.x-*' && \
   apt-mark hold kubelet kubectl
   

   {{% /tab %}} {{% tab name="CentOS, RHEL or Fedora" %}}

   # replace x in {{< skew currentVersion >}}.x-* with the latest patch version
   yum install -y kubelet-'{{< skew currentVersion >}}.x-*' kubectl-'{{< skew currentVersion >}}.x-*' --disableexcludes=kubernetes
   

   {{% /tab %}} {{< /tabs >}}

2. Restart the kubelet:

   sudo systemctl daemon-reload
   sudo systemctl restart kubelet
   

Uncordon the node

Bring the node back online by marking it schedulable:

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

{{% heading "whatsnext" %}}

• See how to Upgrade Windows nodes.