<p>For logs, I mount a volume from host on to the pod. This is written in the deployment yaml.
But, if my 2 pods run on the same host, there will be conflict as both pods will produce log files with same name.
Can I use some dynamic variables in deployment file so that mount on host is created with different name for different pods?</p>

Tarun Dev
<p>you can use <a href="https://kubernetes.io/docs/concepts/storage/volumes/#using-subpath-with-expanded-environment-variables" rel="nofollow noreferrer">subPathExpr</a> to achieve the uniqueness in the absolute path, this is one of the use case of the this feature. As of now its is alpha in k1.14.</p>

<blockquote>
  <p>In this example, a Pod uses subPathExpr to create a directory pod1 within the hostPath volume /var/log/pods, using the pod name from the Downward API. The host directory /var/log/pods/pod1 is mounted at /logs in the container.</p>
</blockquote>

<pre><code>apiVersion: v1
kind: Pod
metadata:
  name: pod1
spec:
  containers:
  - name: container1
    env:
    - name: POD_NAME
      valueFrom:
        fieldRef:
          apiVersion: v1
          fieldPath: metadata.name
    image: busybox
    command: [ "sh", "-c", "while [ true ]; do echo 'Hello'; sleep 10; done | tee -a /logs/hello.txt" ]
    volumeMounts:
    - name: workdir1
      mountPath: /logs
      subPathExpr: $(POD_NAME)
  restartPolicy: Never
  volumes:
  - name: workdir1
    hostPath:
      path: /var/log/pods
</code></pre>
