First, let's remove our existing elasticsearch Deployment Object:
$ kubectl delete deployment elasticsearch
Now, the final step is to create our StatefulSet, which provides each Pod with a unique identity, and link it to the Service, which gives each Pod a subdomain. We do this by specifying the name of the Service as the spec.serviceName property in our StatefulSet manifest file:
...spec: replicas: 3 serviceName: elasticsearch ...
Now, the Service linked to the StatefulSet will get a domain with the following structure:
<service-name>.<namespace>.svc.<cluster-domain>
Our Service's name is elasticsearch. By default, Kubernetes will use the default namespace, and cluster.local as the Cluster Domain. Therefore, ...
