K
Q

Do pods share the filesystems, similar to how they share same network namespace?

6/9/2017

I have created a pod with two containers. I know that different containers in a pod share same network namespace (i.e.,same IP and port space) and can also share a storage volume between them via configmaps. My question is do the pods also share same filesystem. For instance, in my case I have one container 'C1' that generates a dynamic file every 10 min in /var/targets.yml and I want the the other container 'C2' to read this file and perform its own independent action.

Is there a way to do this, may be some workaround via configmaps? or do I have to access these file via networking since each container have their own IP(But this may not be a good idea when it comes to POD restarts). Any suggestions or references please?

-- Suhas Chikkanna
kubectl
kubernetes

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1 Answer

6/9/2017

You can use an emptyDir for this:

apiVersion: v1
kind: Pod
metadata:
  name: test-pd
spec:
  containers:
  - image: gcr.io/google_containers/test-webserver
    name: generating-container
    volumeMounts:
    - mountPath: /cache
      name: cache-volume
  - image: gcr.io/google_containers/test-webserver
    name: consuming-container
    volumeMounts:
    - mountPath: /cache
      name: cache-volume
  volumes:
  - name: cache-volume
    emptyDir: {}

But be aware, that the data isn't persistent during container recreations.

-- svenwltr
Source: StackOverflow