I have statefulset pods. When I go inside one of the pods and try to ping the hostname of it. It works. But if I try to ping the hostnames of other pods from current containers, then those hostnames do not get resolved. I have headless service also in place. Could someone please tell me bare minimum what needs to be done at cluster level or in yaml of either service or statefulset to make the communication happen. An working example or some working charts link to try out, would be helpful. I can go through that.

Service:

apiVersion: v1
kind: Service
metadata:
  name: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}"
  labels:
    app: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}"
{{ include "metadata.labels.standard" . | indent 4 }}    
spec:
  clusterIP: None
  selector:
   tier: backend

StatefulSet:

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}-myapp1"
  labels:
    app: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}-myapp1"
    tier: backend
spec:
  replicas: 2
  selector:
    matchLabels:
      app: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}-myapp1"
  serviceName: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}"
  template:
    metadata:
      labels:
        app: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}-myapp1"
        tier: backend
      volumes:
        - name: configmap-r
          configMap:
           name: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}-configmap"
      imagePullSecrets:
        - name: {{ .Values.image.pullSecret }}
      containers:
        - name: "{{ .Chart.Name }}-{{ .Chart.AppVersion | replace "." "" }}-myapp1"
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
          imagePullPolicy: Always
          ports:
            - containerPort: 8080
          volumeMounts:
            - name: configmap-r
              mountPath: /home/xyz/

Pods:

pod/calico-kube-controllers-59fc8847c-vv9bt   1/1     Running            0          3h27m
pod/calico-node-4gktj                         1/1     Running            0          3h27m
pod/coredns-5c98db65d4-tctgk                  1/1     Running            13         63d
pod/coredns-5c98db65d4-v8gtv                  1/1     Running            13         63d
pod/etcd-minikube                             1/1     Running            2          63d
pod/kube-addon-manager-minikube               1/1     Running            2          63d
pod/kube-apiserver-minikube                   1/1     Running            0          15d
pod/kube-controller-manager-minikube          1/1     Running            6          63d
pod/kube-proxy-qc9nx                          1/1     Running            1          63d
pod/kube-scheduler-minikube                   1/1     Running            6          63d
pod/storage-provisioner                       1/1     Running            3          63d
pod/tiller-deploy-6b9c575bfc-z7dgs            1/1     Running            1          62d


NAME                           TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                  AGE
service/kube-dns               ClusterIP   xx.xx.xx.xx     <none>        53/UDP,53/TCP,9153/TCP   63d
service/tiller-deploy          ClusterIP   xx.xx.xx.xx     <none>        44134/TCP                62d

NAME                         DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                 AGE
daemonset.apps/calico-node   1         1         1       1            1           beta.kubernetes.io/os=linux   3h27m
daemonset.apps/kube-proxy    1         1         1       1            1           beta.kubernetes.io/os=linux   63d

NAME                                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/calico-kube-controllers   1/1     1            1           3h27m
deployment.apps/coredns                   2/2     2            2           63d
deployment.apps/tiller-deploy             1/1     1            1           62d

NAME                                                DESIRED   CURRENT   READY   AGE
replicaset.apps/calico-kube-controllers-59fc8847c   1         1         1       3h27m
replicaset.apps/coredns-5c98db65d4                  2         2         2       63d
replicaset.apps/tiller-deploy-6b9c575bfc            1         1         1       62d

`