K8s handless service

Kubernetes (K8s) provides a way to create and manage services that abstract away the underlying pods and ensure that requests are routed to the appropriate pod instances. When creating a Kubernetes service, you can specify a label selector that identifies the pods that should be included in the service.

A headless service is a special type of Kubernetes service that does not provide a cluster IP address to clients. Instead, it returns the IP addresses of the individual pods that are part of the service. This can be useful for certain types of applications, such as those that require direct access to the individual pods, or those that need to perform custom load balancing.

To create a headless service in Kubernetes, you can simply set the `clusterIP` field to `None` in the service specification. For example:

apiVersion: v1
kind: Service
metadata:
  name: my-headless-service
spec:
  clusterIP: None
  selector:
    app: my-app
  ports:
    - name: http
      port: 80
      targetPort: 8080

This will create a headless service named `my-headless-service` that selects pods with the label `app: my-app`, exposes port 80, and maps it to port 8080 on the pods. When clients query the DNS name of the service, they will receive a list of IP addresses corresponding to the pods that match the label selector.