Problem statement :

I have deployed a spring boot app which when on starting always uses default compute engine service account credentials to authenticate the app , i have a created a seperate service account and key but not able to replace the default one. i tried specifying the new service account in deployement.yaml by using "serviceAccountName" field but still got the error saying service account eg :"xyz" not found.

serviceAccountName: {{ .Values.serviceAccountName }}

so how can i override default service account of compute engine with a specific service account and define it in deployment.yaml.

if i add the credentials of new service account in app code base it will work but that is not a best practice to do so , please someone help me on resolving this issue

snippet of my deployment.yaml file:

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: helloworld
    appVersion: {{ .Values.appVersion }}
  name: helloworld
spec:
  replicas: 1
  selector:
    matchLabels:
      app: helloworld
  template:
    metadata:
      labels:
        app: helloworld
        environment: {{ .Values.environment }}
    spec:
      containers:
        - name: helloworld
          image: {{ .Values.imageSha }}
          imagePullPolicy: Always
          securityContext:
            allowPrivilegeEscalation: false
            runAsUser: 1000
          ports:
            - containerPort: 8080
          env:
          - name: SPRING_CONFIG_LOCATION
            value: "/app/deployments/config/"          
          volumeMounts:
            - name: application-config
              mountPath: "/app/deployments/config"
              readOnly: true
      volumes:
      - name: application-config
        configMap:
          name: {{ .Values.configMapName }}
          items:
          - key: application.properties
            path: application.properties