Mastering Kubernetes - Second Edition

Creating a Cassandra headless service

The role of the headless service is to allow clients in the Kubernetes cluster to connect to the Cassandra cluster through a standard Kubernetes service instead of keeping track of the network identities of the nodes or putting a dedicated load balancer in front of all the nodes. Kubernetes provides all that out of the box through its services.

Here is the configuration file:

apiVersion: v1 
kind: Service 
metadata: 
  labels: 
    app: cassandra 
  name: cassandra 
spec: 
  clusterIP: None 
  ports: 
    - port: 9042 
  selector: 
    app: Cassandra 

The app: Cassandra label will group all the pods to participate in the service. Kubernetes will create endpoint records and the DNS will return a record for discovery. The clusterIP is ...