Amazon EKS Upgrade Playbook: Draining Nodes, Rolling Deployments, and Validation

introduction

Amazon EKS Upgrade Playbook: Draining Nodes, Rolling Deployments, and Validation

Upgrading an Amazon EKS cluster sounds straightforward until you’re mid-process and a production pod crashes because you skipped a step. This Amazon EKS upgrade guide is built for DevOps engineers, platform teams, and SREs who need a clear, repeatable path through the Kubernetes cluster upgrade process — without guessing what comes next.

Here’s what we’ll walk through together:

  • EKS control plane upgrade steps — what order things need to happen and why skipping ahead causes problems
  • EKS node draining best practices — how to safely move workloads off nodes before taking them down, so nothing breaks mid-flight
  • Amazon EKS cluster health validation — the checks you run after the upgrade to confirm everything is actually working, not just looks like it’s working

Whether you’re running managed node groups or self-managed ones, the goal is the same: an EKS zero downtime upgrade that keeps your applications running and your team out of an incident bridge at 2 AM. Let’s get into it.

Understanding the Amazon EKS Upgrade Process

Understanding the Amazon EKS Upgrade Process

Key Differences Between Control Plane and Data Plane Upgrades

The control plane (API server, etcd) upgrades first; worker nodes follow separately.

How Version Skew Policies Affect Your Upgrade Path

  • Nodes can lag the control plane by one minor version max

Why a Structured EKS Upgrade Playbook Reduces Risk

Sequential steps prevent version skew violations and protect running workloads.

Pre-Upgrade Preparation for a Smooth Transition

Pre-Upgrade Preparation for a Smooth Transition

A. Auditing Current Cluster Version and Node Group Configurations

Run kubectl version and check node group AMI versions in the AWS console.

B. Reviewing Deprecated APIs

Use kubectl deprecations or Pluto to catch breaking API changes before your Amazon EKS version upgrade.

C. Backing Up Critical Resources

Snapshot etcd and export key manifests via Velero.

D. Setting Rollback Thresholds

Define clear success criteria upfront.

Upgrading the EKS Control Plane Safely

Upgrading the EKS Control Plane Safely

A. Initiating the Control Plane Upgrade via AWS Console or CLI

Run aws eks update-cluster-version --name <cluster> --kubernetes-version <version> or trigger it through the EKS Console.

B. Monitoring API Server Availability

Watch for brief API disruptions using kubectl get nodes --watch.

C. Verifying Control Plane Health

Confirm all components are running before touching nodes.

Draining Nodes to Protect Running Workloads

Draining Nodes to Protect Running Workloads

Understanding How kubectl drain Works in EKS Environments

Run kubectl drain <node-name> --ignore-daemonsets --delete-emptydir-data to safely evict pods before replacement.

Configuring PodDisruptionBudgets

Set minAvailable or maxUnavailable to cap simultaneous evictions during EKS node draining, protecting uptime.

Handling Stuck Pods

Force-delete with --force --grace-period=0 only when pods are genuinely unresponsive.

Cordoning Nodes

kubectl cordon <node> blocks new scheduling immediately.

Executing Rolling Deployments Across Node Groups

Executing Rolling Deployments Across Node Groups

Upgrading Managed Node Groups with Zero-Downtime Rolling Updates

For a smooth Kubernetes rolling deployment strategy, configure maxUnavailable: 1 and maxSurge: 1 in your node group settings. When managing self-managed groups, update launch templates first. Use Karpenter or Cluster Autoscaler to handle node replacement automatically, and always upgrade non-critical node groups before production workloads.

Validating Cluster Health After the Upgrade

Validating Cluster Health After the Upgrade

A. Confirming All Nodes Are Running the Target Kubernetes Version

Run kubectl get nodes to verify version alignment across your cluster.

B. Running Smoke Tests

Hit critical endpoints and check pod restarts using kubectl get pods -A.

C. Upgrading CoreDNS, kube-proxy, and VPC CNI

Match add-on versions to your new Kubernetes release via EKS console or CLI.

D. Reviewing CloudWatch Metrics

Watch for CPU spikes, API errors, and log anomalies post-upgrade.

conclusion

Upgrading your Amazon EKS cluster doesn’t have to be a stressful, nail-biting experience. With the right preparation, a clear understanding of the upgrade process, and a solid plan for draining nodes and rolling out deployments, you can keep your workloads running smoothly without any nasty surprises. The key is taking it step by step — getting your pre-upgrade checks done, upgrading the control plane carefully, and then working through your node groups methodically before validating that everything is healthy on the other side.

The real takeaway here is that a successful EKS upgrade is less about technical wizardry and more about discipline and process. Don’t skip the validation steps, don’t rush the node draining, and always have a rollback plan ready just in case. Go ahead and put this playbook to work on your next upgrade — your future self (and your team) will thank you for it.

The post Amazon EKS Upgrade Playbook: Draining Nodes, Rolling Deployments, and Validation first appeared on Business Compass LLC.



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