Mounting ConfigMap as Volume

app.yaml

apiVersion: v1
kind: Pod
metadata:
  name: config-map-demo
spec:
  containers:
    - name: demo
      image: alpine
      command: ["/bin/ash"]
      args: ["-c", "cat hello-world.txt"]
      volumeMounts:
      - name: sample-volume
        mountPath: /hello-world.txt
        subPath: hello-world.txt
  volumes:
    - name: sample-volume
      configMap:
        name: sample-config-map
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: sample-config-map
data:
  hello-world.txt: |
    Hello, world!