How To Update Kubernetes Version in AWS EKS Cluster ?

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In this post, we will see How To Update Kubernetes Version in AWS EKS Cluster.

• You launch AWS EKS new API server nodes with the updated Kubernetes version
• This replaces the existing ones.
• If AWS EKS sanity checks fails, the previous Kubernetes version stays back.

Pre Steps:

Firstly install or check "eksctl" - use the latest version.

##MAC
brew tap weaveworks/tap
brew install weaveworks/tap/eksctl
brew upgrade eksctl && brew link --overwrite eksctl
eksctl version

#Windows
choco install -y eksctl
choco upgrade -y eksctl
eksctl version

\# Linux
curl --silent --location "https://github.com/weaveworks/eksctl/releases/latest/download/eksctl\_$(uname -s)\_amd64.tar.gz" | tar xz -C /tmp
sudo mv /tmp/eksctl /usr/local/bin

eksctl version

 

Solution:

Follow the steps below -

• Check current Kubernetes version

kubectl version --short

• Check current version of your nodes (self-managed\managed AWS EC2 and Fargate nodes)

kubectl get nodes

• Ensure the versions in the nodes are in sync and compatible or preferably same.

 

• Check the pod policy

kubectl get psp eks.privileged

 

• Update cluster

eksctl upgrade cluster --name my-cluster --approve

OR Through AWS EKS Console. Choose Update cluster version. Select Kubernetes version and choose Update & Confirm. OR Through AWS CLI

aws eks update-cluster-version \\
 --region region-code \\ 
--name eks-cluster \\ 
--kubernetes-version x.yz

aws eks describe-update \\
 --region region-code \\
 --name eks-cluster \\
 --update-id <UPDATE ID FROM ABOVE PREVIOUS COMMAND EXECUTION>

 

• Update the nodes to also the same Kubernetes version.

    Hope this helps.  

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