instruction: Create a Dockerfile for cluster
output: ```dockerfile
  from the merged kubeconfig files.
  If there are two conflicting techniques, fail.
  
  For any information still missing, use default values and potentially
  prompt for authentication information.
  
  File references
  File and path references in a kubeconfig file are relative to the location of the kubeconfig file.
  File references on the command line are relative to the current working directory.
  In $HOME/.kube/config, relative paths are stored relatively, and absolute paths
  are stored absolutely.
  Proxy
  You can configure kubectl to use a proxy per cluster using proxy-url in your kubeconfig file, like this:
  apiVersion: v1
  kind: Config
  
  clusters:
  - cluster:
   proxy-url: http://proxy.example.org:3128
   server: https://k8s.example.org/k8s/clusters/c-xxyyzz
   name: development
  
  users:
  - name: developer
  
  contexts:
  - context:
   name: development
  What's next
  
  Configure Access to Multiple Clusters
  kubectl config
  
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   Last modified April 13, 2022 at 9:05 PM PST: Docs fix for kubectl proxy configuration (81fe9b4e91)
  
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  Supporting multiple clusters, users, and authentication mechanisms
  Context
  The KUBECONFIG environment variable
  Merging kubeconfig files
  File references
  Proxy
  What's next
  
  Documentation
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  Community
  Case Studies
  
  © 2025 The Kubernetes Authors | Documentation Distributed under CC BY 4.0
  
  ICP license: 京ICP备17074266号-3
  ```