How do you authenticate kubectl to an EKS cluster (aws-auth / access entries)?
AWS · Intermediate level
Answer
kubectl to EKS uses AWS IAM authentication, then Kubernetes authorization. Historically access mapping used aws-auth ConfigMap; access entries provide an EKS API-managed access model, but RBAC still controls in-cluster permissions.
Technical explanation
Authentication is IAM-based, but Kubernetes RBAC or access policies still define what the caller can do.
EKS is managed Kubernetes, not no-ops Kubernetes: IAM, networking, add-ons, node strategy, upgrades, RBAC, policies, and workload reliability remain customer responsibilities.
Workload identity, private networking, image security, ingress standards, autoscaling, and observability are foundational controls for production clusters.
Troubleshooting EKS requires separating control-plane, node, CNI, scheduler, ingress, and application failure domains.
Hands-on example
1. Create or use an EKS sandbox cluster with private subnets, managed add-ons, workload IAM, and a sample namespace.
2. Deploy a small container from ECR using Kubernetes manifests or Helm, with readiness/liveness probes and resource requests.
3. Add ingress/load balancing, pod IAM, logging, metrics, and network/security controls relevant to the question.
4. Test node replacement, pod rescheduling, image pulls, access control, and rollback.
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