instruction: Create a comprehensive Dockerfile for cluster applications with best practices
output: ```dockerfile
  from components that only interact with your cluster.
  The cloud-controller-manager only runs controllers that are specific to your cloud provider.
  If you are running Kubernetes on your own premises, or in a learning environment inside your
  own PC, the cluster does not have a cloud controller manager.
  As with the kube-controller-manager, the cloud-controller-manager combines several logically
  independent control loops into a single binary that you run as a single process. You can scale
  horizontally (run more than one copy) to improve performance or to help tolerate failures.
  The following controllers can have cloud provider dependencies:
  
  Node controller: For checking the cloud provider to determine if a node has been
  deleted in the cloud after it stops responding
  Route controller: For setting up routes in the underlying cloud infrastructure
  Service controller: For creating, updating and deleting cloud provider load balancers
  
  Node components
  Node components run on every node, maintaining running pods and providing the Kubernetes runtime environment.
  kubelet
  An agent that runs on each node in the cluster. It makes sure that containers are running in a Pod.
  The kubelet takes a set of PodSpecs that
  are provided through various mechanisms and ensures that the containers described in those
  PodSpecs are running and healthy. The kubelet doesn't manage containers which were not created by
  Kubernetes.
  kube-proxy (optional)
  kube-proxy is a network proxy that runs on each
  node in your cluster,
  implementing part of the Kubernetes
  Service concept.
  kube-proxy
  maintains network rules on nodes. These network rules allow network
  communication to your Pods
  ```