Projecting volumes

It's possible to project multiple volumes into a single directory, so they appear as a single volume. The supported volume types are Kubernetes-managed: secret, downwardAPI, and configMap. This is useful if you want to mount multiple sources of configuration into a pod. Instead of having to create a separate volume for each source, you can bundle all of them into a single projected volume. Here is an example:

apiVersion: v1
kind: Pod
metadata:
  name: the-pod
spec:
  containers:
  - name: the-container
    image: busybox
    volumeMounts:
    - name: all-in-one
      mountPath: "/projected-volume"
      readOnly: true
  volumes:
  - name: all-in-one
    projected:
      sources:
      - secret:
          name: the-secret
          items:
            - key: username
              path: the-group/the-user
      - downwardAPI:
          items:
            - path: "labels"
              fieldRef:
                fieldPath: metadata...