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Upgrading kubeadm clusters from 1.6 to 1.7

This guide is for upgrading kubeadm clusters from version 1.6.x to 1.7.x. Upgrades are not supported for clusters lower than 1.6, which is when kubeadm became Beta.

WARNING: These instructions will overwrite all of the resources managed by kubeadm (static pod manifest files, service accounts and RBAC rules in the kube-system namespace, etc.), so any customizations you may have made to these resources after cluster setup will need to be reapplied after the upgrade. The upgrade will not disturb other static pod manifest files or objects outside the kube-system namespace.

• Before you begin
• On the master
• On each node

Before you begin

You need to have a Kubernetes cluster running version 1.6.x.

On the master

1. Upgrade system packages.

   Upgrade your OS packages for kubectl, kubeadm, kubelet, and kubernetes-cni.

   a. On Debian, this can be accomplished with:

   sudo apt-get update
   sudo apt-get upgrade
   

   b. On CentOS/Fedora, you would instead run:

   sudo yum update
   

2. Restart kubelet.

   sudo systemctl restart kubelet
   

3. Delete the kube-proxy DaemonSet.

   Although most components are automatically upgraded by the next step, kube-proxy currently needs to be manually deleted so it can be recreated at the correct version:

   sudo KUBECONFIG=/etc/kubernetes/admin.conf kubectl delete daemonset kube-proxy -n kube-system
   

4. Perform kubeadm upgrade.

   WARNING: All parameters you passed to the first kubeadm init when you bootstrapped your cluster MUST be specified here in the upgrade-kubeadm init-command. This is a limitation we plan to address in v1.8.

   sudo kubeadm init --skip-preflight-checks --kubernetes-version <DESIRED_VERSION>
   

   For instance, if you want to upgrade to 1.7.0, you would run:

   sudo kubeadm init --skip-preflight-checks --kubernetes-version v1.7.0
   

5. Upgrade CNI provider.

   Your CNI provider might have its own upgrade instructions to follow now. Check the addons page to find your CNI provider and see if there are additional upgrade steps necessary.

On each node

1. Upgrade system packages.

   Upgrade your OS packages for kubectl, kubeadm, kubelet, and kubernetes-cni.

   a. On Debian, this can be accomplished with:

   sudo apt-get update
   sudo apt-get upgrade
   

   b. On CentOS/Fedora, you would instead run:

   sudo yum update
   

2. Restart kubelet.

   sudo systemctl restart kubelet