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AWS EKS Managed Kubernetes

Managed Kubernetes control plane with worker nodes, IRSA, and add-ons for the K8s ecosystem.

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Why

EKS gives full K8s API — Helm, operators, CRDs, the entire ecosystem. AWS manages control plane ($73/mo), you manage nodes.

IRSA maps K8s SA to IAM roles for secure AWS access.

When

Use EKS when you need K8s ecosystem (Helm charts, operators, multi-cluster) or portability across clouds. Use ECS for simpler Docker workloads.

How

1. Create cluster — eksctl create cluster (simplest), or Terraform 2. Node groups — managed (AWS patches), self-managed, or Fargate profile 3. IRSA — associate IAM role with K8s ServiceAccount, OIDC provider 4. Add-ons — VPC CNI, CoreDNS, kube-proxy (managed), plus external (cert-manager) 5. Ingress — ALB Controller (AWS) or NGINX Ingress Controller 6. Storage — EBS CSI driver for PV, EFS for shared, S3 via CSI 7. Logging — Fluent Bit/Fluentd → CloudWatch or OpenSearch 8. Autoscaling — Cluster Autoscaler or Karpenter (faster, simpler)

Example

# eksctl cluster config cat > cluster.yaml <<EOF apiVersion: eksctl.io/v1alpha5 kind: ClusterConfig metadata: name: prod region: us-east-1 managedNodeGroups: - name: standard instanceType: m5.large desiredCapacity: 3 iam: withAddonPolicies: autoScaler: true cloudWatch: true fargateProfiles: - name: serverless selectors: - namespace: fargate EOF eksctl create cluster -f cluster.yaml # IRSA — grant S3 access to a K8s service account eksctl create iamserviceaccount \ --cluster prod --namespace default --name my-sa \ --attach-policy-arn arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess \ --approve

Common Problems

  • ⚠Control plane $73/mo even idle — expensive for dev, use k3s/Kind locally
  • ⚠VPC CNI IP exhaustion — each pod uses a secondary IP, use prefix delegation or Custom Networking
  • ⚠Nodes not joining — check node IAM role, SSM, and subnet tags kubernetes.io/cluster/<name>

Best Practices

  • ✓Use Karpenter not Cluster Autoscaler — faster provisioning, simpler config, no ASG
  • ✓IRSA over node IAM — per-pod permissions, no broad node role, least privilege
  • ✓Use managed node groups — AWS patches nodes, integrates with EKS add-ons

FAQ

What is AWS EKS Managed Kubernetes and what problem does it solve?

Managed Kubernetes control plane with worker nodes, IRSA, and add-ons for the K8s ecosystem. It lets developers deploy, store, and scale without self-managing infrastructure — a core reference for cloud service selection.

How do I get started with AWS EKS Managed Kubernetes in 5 minutes?

Two steps to run it: (1) Create cluster — eksctl create cluster (simplest), or Terraform; (2) Node groups — managed (AWS patches), self-managed, or Fargate profile. Validate on the free tier first, then wire into production.

What is the #1 pitfall with AWS EKS Managed Kubernetes?

The most frequent issue is: Control plane $73/mo even idle — expensive for dev, use k3s/Kind locally. Run a pre-launch checklist item by item, and add policy/config scanning in CI.

What are the best practices for AWS EKS Managed Kubernetes?

Best practices for AWS EKS Managed Kubernetes include: Use Karpenter not Cluster Autoscaler — faster provisioning, simpler config, no ASG; IRSA over node IAM — per-pod permissions, no broad node role, least privilege; Use managed node groups — AWS patches nodes, integrates with EKS add-ons. The first one — "Use Karpenter not Cluster Autoscaler — faster provisioning, simpler config, no ASG" — should be a team default baked into your IaC templates.

How do I control cost and avoid bill surprises with AWS EKS Managed Kubernetes?

Three ways to prevent overspend: (1) tag every resource with env/team and enable billing alarms; (2) set budget thresholds to trigger Slack/email alerts; (3) review idle resources in Cost Explorer regularly and clean them up. Most AWS EKS Managed Kubernetes options offer a free tier — validate within free quota before scaling.