I'm new to Kubernetes and recently I am using it to deploy hadoop. I want to do a thing that set a specific hostname to pod which is created using statefulSets with hostNetwork = true.

Here is my yaml config file.

apiVersion: v1
kind: Service
metadata:
  name: test-bbox
  labels:
    app: test-bbox
spec:
  clusterIP: None
  selector:
    app: test-bbox
  ports:
  - name: foo
    port: 1234
    targetPort: 1234
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: test-bbox
spec:
  serviceName: "test-bbox"
  replicas: 1
  selector:
    matchLabels:
      app: test-bbox
  template:
    metadata:
      labels:
        app: test-bbox
    spec:
      hostNetwork: true
      hostname: test-hostname
      containers:
        - image: busybox
          name: busybox
          env:
          - name: MY_POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          command:
            - sleep
            - "7200"

As the yaml says, the attribute hostnetwork is set to true. Then the pod test-bbox-0's hostname is the hostname of the Node where it is created.

If I set hostnetwork to false, the hostname is auto-generated by statefulSets as a format such as test-bbox-0.test-bbox.default.svc.cluster.local, which is just I need.

But in my case I need to set hostnetwork to true and at the same time to customize the hostname to the format mentioned above rather than the Node's hostname.

So the question is, is there any way to customize hostname for Pod ?

Kubernetes version used : 1.9