instruction: Create a Dockerfile for networking
output: ```dockerfile
  from outside the cluster to Services within
  your cluster.
  Read about Gateway, an extension to
  Kubernetes that provides more flexibility than Ingress.
  
  For more context, read the following:
  
  Virtual IPs and Service Proxies
  EndpointSlices
  Service API reference
  EndpointSlice API reference
  Endpoint API reference (legacy)
  
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  Services in Kubernetes
  
  Cloud-native service discovery
  
  Defining a Service
  
  Port definitions
  Services without selectors
  EndpointSlices
  Endpoints
  Application protocol
  Multi-port Services
  
  Service type
  
  type: ClusterIP
  type: NodePort
  type: LoadBalancer
  type: ExternalName
  
  Headless Services
  
  With selectors
  Without selectors
  
  Discovering services
  
  Environment variables
  DNS
  
  Virtual IP addressing mechanism
  
  Traffic policies
  Session stickiness
  
  External IPs
  API Object
  What's next
  
  Documentation
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  Community
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  © 2025 The Kubernetes Authors | Documentation Distributed under CC BY 4.0
  
  ICP license: 京ICP备17074266号-3
  ```