EKS Auto Mode

Overview

EKS Auto Mode automatically manages the data plane (nodes) including provisioning, scaling, updates, and security patches.

Key Features

• Automatic node provisioning
• Automatic OS and Kubernetes version updates
• Built-in cost optimization
• Integrated security (OS patching)
• Simplified operations

Enable Auto Mode

# Create cluster with Auto Mode
eksctl create cluster \
  --name my-cluster \
  --region us-west-2 \
  --with-eks-auto-mode

Or enable on existing cluster via AWS Console or API.

Configure Auto Mode

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
  name: my-cluster
  region: us-west-2
autoModeConfig:
  enabled: true
  nodePools:
    - name: general
      instanceTypes: ["m5.large", "m5.xlarge"]
      minSize: 1
      maxSize: 10
    - name: gpu
      instanceTypes: ["g4dn.xlarge"]
      minSize: 0
      maxSize: 2
      taints:
        - key: "nvidia.com/gpu"
          value: "true"
          effect: "NoSchedule"

Compute Comparison

Feature	EKS Auto Mode	MNG	Karpenter
Node management	Full	Partial	Partial
OS patching	Auto	Manual	Manual
Scaling	Policy-based	ASG-based	Workload-based
Pricing	EC2 + fee	EC2	EC2

When to Use Auto Mode

• Want minimal operational overhead
• Prefer opinionated configuration
• Don’t need fine-grained node control
• Want automatic security compliance

References

• EKS Auto Mode
• EC2 Managed Instances