EKS Basic

• Pod의 containerPort에 name 을 붙이면, service 에서 targetPort로 해당 name을 사용할 수 있다.

EndpointSlice

• EndpointSlice contains references to a set of network endpoints. The control plane automatically creates EndpointSlices for any Kubernetes Service that has a selector specified.
• By default, the control plane creates and manages EndpointSlices to have no more than 100 endpoints each. You can configure this with the --max-endpoints-per-slice kube-controller-manager flag, up to a maximum of 1000.
• EndpointSlices can act as the source of truth for kube-proxy when it comes to how to route internal traffic.

Selector 없는 Service

• 외부의 DB에 접근할 때
• 다른 namespace나 다른 cluster에 접근할 때
• kubernetes migration할 때
• Selector 가 없는 service는 EndpointSlice를 control plane에서 직접 생성해주지 않아 수동으로 생성해줘야 함

apiVersion: discovery.k8s.io/v1
kind: EndpointSlice
metadata:
  name: my-service-1 # by convention, use the name of the Service
                     # as a prefix for the name of the EndpointSlice
  labels:
    # You should set the "kubernetes.io/service-name" label.
    # Set its value to match the name of the Service
    kubernetes.io/service-name: my-service
addressType: IPv4
ports:
  - name: '' # empty because port 9376 is not assigned as a well-known
             # port (by IANA)
    appProtocol: http
    protocol: TCP
    port: 9376
endpoints:
  - addresses:
      - "10.4.5.6"
  - addresses:
      - "10.1.2.3"