How to implement volumes-from in Kubernetes Pod?

pod1.yml

---
apiVersion: v1
kind: Pod
metadata:
    name: server
spec:
    containers:
    - image: resouer/sample:v2
      name: war
      lifecycle:
        postStart:
          exec:
            command:
              - "cp"
              - "/sample.war"
              - "/app"
      volumeMounts:
      - mountPath: /app
        name: hostv1 
    - name: peer
      image: busybox
      command: ["tail", "-f", "/dev/null"]
      volumeMounts:
      - name: hostv2
        mountPath: /app/sample.war
    volumes:
    - name: hostv1
      hostPath:
          path: /tmp
    - name: hostv2
      hostPath:
          path: /tmp/sample.war

Keep the side car alive so that it doesn't get restarted. This could also be implemented
with pause.
Note: This won't be necessary when per-pod restart policies are implemented
while true; do sleep 10; done

@kjvalencik What do you mean by "pause"? Java Web Application with Tomcat and Sidercar Container keeps its sidecar container alive by invoking tail -f /dev/null.

Guys, this can be solved more elegant by using initContainer, see my update in the original answer: http://stackoverflow.com/questions/30538210/how-to-mimic-volumes-from-in-kubernetes/33118902#33118902