gateway api externaldns EKS Terraform kubernetes networking ipamd cni binary aws vpc cni aws-node Node group EKS Architecture auto mode pv/pvc k8s scheduler eksctl Instance Store kube-proxy ClusterIP CoreDNS EmptyDir HostPath nodeport Fargate 쿠버네티스 네트워크 hashicorp Kubernetes Ingress dockerfile Vault aws 테라폼 ㄴ EFS node Controller snapshot EBS