instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from the external load balancer is directed at the backend Pods. The cloud
  provider decides how it is load balanced.
  To implement a Service of type: LoadBalancer, Kubernetes typically starts off
  by making the changes that are equivalent to you requesting a Service of
  type: NodePort. The cloud-controller-manager component then configures the external
  load balancer to forward traffic to that assigned node port.
  You can configure a load balanced Service to
  omit assigning a node port, provided that the
  cloud provider implementation supports this.
  Some cloud providers allow you to specify the loadBalancerIP. In those cases, the load-balancer is created
  with the user-specified loadBalancerIP. If the loadBalancerIP field is not specified,
  the load balancer is set up with an ephemeral IP address. If you specify a loadBalancerIP
  but your cloud provider does not support the feature, the loadbalancerIP field that you
  set is ignored.
  
  Note: The.spec.loadBalancerIP field for a Service was deprecated in Kubernetes v1.24.
  This field was under-specified and its meaning varies across implementations.
  It also cannot support dual-stack networking. This field may be removed in a future API version.
  If you're integrating with a provider that supports specifying the load balancer IP address(es)
  for a Service via a (provider specific) annotation, you should switch to doing that.
  If you are writing code for a load balancer integration with Kubernetes, avoid using this field.
  You can integrate with Gateway rather than Service, or you
  can define your own (provider specific) annotations on the Service that specify the equivalent detail.
  
  Load balancers with mixed protocol types
  
  FEATURE STATE: Kubernetes v1.26 [stable]
  
  By default, for LoadBalancer type of Services, when there is more than one port defined, all
  ports must have the same protocol, and the protocol must be one which is supported
  by the cloud provider.
  The feature gate MixedProtocolLBService (enabled by default for the kube-apiserver as of v1.24) allows the use of
  different protocols for LoadBalancer type of Services, when there is more than one port defined.
  
  Note: The set of protocols that can be used for load balanced Services is defined by your
  cloud provider; they may impose restrictions beyond what the Kubernetes API enforces.
  
  Disabling load balancer NodePort allocation
  
  FEATURE STATE: Kubernetes v1.24 [stable]
  
  You can optionally disable node port allocation for a Service of type: LoadBalancer, by setting
  the field spec.allocateLoadBalancerNodePorts to false. This should only be used for load balancer implementations
  that route traffic directly to pods as opposed to using node ports. By default, spec.allocateLoadBalancerNodePorts
  is true and type LoadBalancer Services will continue to allocate node ports. If spec.allocateLoadBalancerNodePorts
  is set to false on an existing Service with allocated node ports, those node ports will not be de-allocated automatically.
  You must explicitly remove the nodePorts entry in every Service port to de-allocate those node ports.
  Specifying class of load balancer implementation
  
  FEATURE STATE: Kubernetes v1.24 [stable]
  
  For a Service with type set to LoadBalancer, the .spec.loadBalancerClass field
  enables you to use a load balancer implementation other than the cloud provider default.
  By default, .spec.loadBalancerClass is not set and a LoadBalancer
  type of Service uses the cloud provider's default load balancer implementation if the
  cluster is configured with a cloud provider using the --cloud-provider component
  flag.
  If you specify .spec.loadBalancerClass, it is assumed that a load balancer
  implementation that matches the specified class is watching for Services.
  Any default load balancer implementation (for example, the one provided by
  the cloud provider) will ignore Services that have this field set.
  spec.loadBalancerClass can be set on a Service of type LoadBalancer only.
  Once set, it cannot be changed.
  The value of spec.loadBalancerClass must be a label-style identifier,
  with an optional prefix such as "internal-vip" or "example.com/internal-vip".
  Unprefixed names are reserved for end-users.
  Specifying IPMode of load balancer status
  
  FEATURE STATE: Kubernetes v1.29 [alpha]
  
  Starting as Alpha in Kubernetes 1.29,
  a feature gate
  named LoadBalancerIPMode allows you to set the .status.loadBalancer.ingress.ipMode
  for a Service with type set to LoadBalancer.
  The .status.loadBalancer.ingress.ipMode specifies how the load-balancer IP behaves.
  It may be specified only when the .status.loadBalancer.ingress.ip field is also specified.
  There are two possible values for .status.loadBalancer.ingress.ipMode: "VIP" and "Proxy".
  The default value is "VIP" meaning that traffic is delivered to the node
  with the destination set to the load-balancer's IP and port.
  There are two cases when setting this to "Proxy", depending on how the load-balancer
  ```