I have created a configmap and a pod yaml file .

I have tried multiple solutions but none worked for me .

kubectl describe cm cf3
Name:         cf3
Namespace:    default
Labels:       <none>
Annotations:  <none>

Data
====
index.html:
----
hii im marimmo

Events:  <none

pod yaml file

apiVersion: v1
kind: Pod
metadata:
  name: dapi-test-pod
spec:
  containers:
  - name: test-container
    image: manya97/manya_tomcat:0.1

  volumeMounts:
  - name: config-volume
    mountPath: /apache-tomcat-8.0.32/webapps/SampleWebApp/index.html
    subPath: index.html
volumes:
- name: config-volume
  configMap:
          name: cf3

restartPolicy: Never

this was supposed to replace existing index.html file but somehow it removes all the content of SampleWebApp and places only index.html. I dont know if have done it in correct way , I want to replace only content of index.html. Might be possible that mounting works this way I do not know .