Kubernetes to EKS Migration: Secret Steps 95% Miss in 2026

Pre-Migration Planning and Assessment

Marcus watched in horror as their Kubernetes cluster went down at 3 AM. No automatic failover, no managed recovery, just pure panic and a very angry CEO demanding answers. "Why aren't we using managed Kubernetes yet?" she asked. It was a question that would lead to their most successful infrastructure decision ever.

Sound familiar? You're not alone. 73% of organizations are planning or executing Kubernetes to EKS migrations in 2026, and for good reason.

Why Migrate to EKS in 2026?

Amazon EKS provides significant advantages over self-managed Kubernetes clusters:

• Reduced Operational Overhead: 60% less time spent on cluster management tasks
• Enhanced Security: Automatic security patches, AWS IAM integration, and compliance certifications
• Improved Scalability: Auto-scaling capabilities with AWS Fargate and EC2 integration
• Cost Optimization: Pay-as-you-go pricing with potential 20-30% savings
• Native AWS Integration: Seamless connectivity with 200+ AWS services

Migration Assessment Framework

Before beginning your migration, conduct a comprehensive assessment of your current infrastructure:

Migration Strategy Selection

Choose your migration approach based on downtime tolerance and complexity:

EKS Environment Setup

Step 1: Create EKS Cluster with eksctl

The fastest way to create a production-ready EKS cluster is using eksctl with a configuration file:

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: production-eks
  region: us-west-2
  version: "1.30"

managedNodeGroups:
  - name: workers
    instanceType: t3.medium
    desiredCapacity: 3
    minSize: 2
    maxSize: 10
    volumeSize: 100
    ssh:
      allow: true
    tags:
      Environment: production
      Team: platform

addons:
  - name: aws-ebs-csi-driver
  - name: aws-efs-csi-driver
  - name: aws-load-balancer-controller

iam:
  withOIDC: true
  serviceAccounts:
    - metadata:
        name: aws-load-balancer-controller
        namespace: kube-system
      wellKnownPolicies:
        awsLoadBalancerController: true

# Create EKS cluster
eksctl create cluster -f cluster.yaml

# Configure kubectl access
aws eks update-kubeconfig --name production-eks --region us-west-2

# Verify cluster access
kubectl get nodes

Step 2: Configure Essential AWS Services

Set up critical AWS integrations for production readiness:

# Add Helm repository
helm repo add eks https://aws.github.io/eks-charts
helm repo update

# Install AWS Load Balancer Controller
helm install aws-load-balancer-controller eks/aws-load-balancer-controller \
  -n kube-system \
  --set clusterName=production-eks \
  --set serviceAccount.create=false \
  --set serviceAccount.name=aws-load-balancer-controller

# Verify installation
kubectl get deployment -n kube-system aws-load-balancer-controller

Step 3: Network Configuration

Configure VPC networking for optimal performance and security:

• Subnet Planning: Use private subnets for worker nodes, public subnets for load balancers
• Security Groups: Implement least-privilege access controls
• NAT Gateway: Ensure outbound connectivity for private subnets
• VPC CNI: Configure pod networking and IP address management

Application and Data Migration

Workload Migration Strategy

Migrate applications systematically to minimize risk and ensure validation:

# Export all resources from source cluster
kubectl get all -o yaml --all-namespaces > all-resources.yaml

# Export specific namespace
kubectl get all -n production -o yaml > production-resources.yaml

# Export ConfigMaps and Secrets separately
kubectl get configmaps -o yaml --all-namespaces > configmaps.yaml
kubectl get secrets -o yaml --all-namespaces > secrets.yaml

Storage Migration

Handle persistent data migration based on your storage type:

# Install Velero on source cluster
velero install \
    --provider aws \
    --plugins velero/velero-plugin-for-aws:v1.8.0 \
    --bucket my-backup-bucket \
    --secret-file ./credentials-velero

# Create backup
velero backup create migration-backup --include-namespaces production

# Install Velero on EKS cluster
velero install \
    --provider aws \
    --plugins velero/velero-plugin-for-aws:v1.8.0 \
    --bucket my-backup-bucket \
    --secret-file ./credentials-velero

# Restore to EKS
velero restore create --from-backup migration-backup

Service Migration and Testing

Implement comprehensive testing before cutting over traffic:

Post-Migration Optimization

Monitoring and Observability

Set up comprehensive monitoring for your new EKS cluster:

# Install CloudWatch agent
kubectl apply -f https://raw.githubusercontent.com/aws-samples/amazon-cloudwatch-container-insights/latest/k8s-deployment-manifest-templates/deployment-mode/daemonset/container-insights-monitoring/cloudwatch-namespace.yaml

kubectl apply -f https://raw.githubusercontent.com/aws-samples/amazon-cloudwatch-container-insights/latest/k8s-deployment-manifest-templates/deployment-mode/daemonset/container-insights-monitoring/cwagent/cwagent-daemonset.yaml

kubectl apply -f https://raw.githubusercontent.com/aws-samples/amazon-cloudwatch-container-insights/latest/k8s-deployment-manifest-templates/deployment-mode/daemonset/container-insights-monitoring/fluentd/fluentd-daemonset-cloudwatchlogs.yaml

Cost Optimization

Implement cost optimization strategies specific to EKS:

• Spot Instances: Use spot instances for non-critical workloads (up to 90% savings)
• Fargate: Serverless compute for batch jobs and irregular workloads
• Cluster Autoscaler: Automatic node scaling based on demand
• Resource Right-sizing: Use VPA (Vertical Pod Autoscaler) for optimal resource allocation
• Reserved Instances: Commit to long-term usage for predictable savings

Security Hardening

Implement EKS-specific security best practices:

Performance Optimization

Fine-tune your EKS cluster for optimal performance:

Conclusion

Migrating from self-managed Kubernetes to Amazon EKS represents more than just an infrastructure change—it's a strategic move toward operational excellence. Organizations typically see a 60% reduction in operational overhead, 20-30% cost savings, and significantly improved security posture.

The key to successful migration lies in thorough planning, systematic execution, and comprehensive testing. By following the strategies and tools outlined in this guide, you can achieve zero-downtime migration while avoiding the common pitfalls that cost organizations thousands of dollars in delays and rework.

Ready to start your EKS migration journey? Begin with a small pilot project to validate your approach, then scale the process across your entire infrastructure portfolio.