How to display the content of the volume? - openshift

Question

How to display the content of the openshift volume? (files that are in, the total space used etc.).
The only information I've managed to find in the docs is to oc rsh into the running POD and use ls, which of course is no way a viable solution if no pod using the volume is running and can't be started because of some issues with the volume...

Answer 1

For the moment there's no "volume file explorer" or whatever interface in Openshift.
Currently you always need to attach the volume to a running pod and list files within.
If you're using glusterfs (and are cluster/storage admin) all volumes are also mounted inside the storage pods , so you can get a complete overview within the storage pods.

Answer 2

I don't know these ways are fit for you, but I just list the availabilities as follows.
As far as I remember, if the pod can be created based on docker image, then you can run without run the application like this.
oc run tmp-pod --image=your-docker-registry.default.svc/yourapplication -- tail -f /dev/null
You are using PersistentVolume(PV/PVC pair) for your volume, then you can display the volume after mounting temporarily the PV to temporary pod as follows.
oc run tmp-pod --image=registry.access.redhat.com/rhel7 -- tail -f /dev/null
oc set volume dc/tmp-pod --add -t pvc --name=new-registry --claim-name=new-registry --mount-path=/mountpath
You can see the volume contents mounted above configuration via tmp-pod, and you can remove above temporary pod simply after checking.
I hope it help you.

Answer 3

The solution proposed by #Daein Park to display the PersistentVolume(PV/PVC pair) content was not working for me. The command oc run tmp-pod does not create a dc deploymentConfig and it seems impossible to set a volume to a pod.
My solution was to use the following command:
oc run tmp-pod --image=dummy --restart=Never --overrides='{"spec":{"containers":[{"command":["tail","-f","/dev/null"],"image":"registry.access.redhat.com/rhel7","name":"tmp-pod","volumeMounts":[{"mountPath":"/mountpath","name":"volume"}]}],"volumes":[{"name":"volume","persistentVolumeClaim":{"claimName":"pv-clain"}}]}}'
NOTE2: The --image=dummy is only provided to make the oc run command happy, anyway the image field is overridden the json.
Finally, to list the content of the mounted volume:
oc rsh tmp-pod ls /mountpath
As the json content is not easy to read in the command line, here is what it is provided to the --overrides parameter:
{
"spec": {
"containers": [{
"command": ["tail", "-f", "/dev/null"],
"image": "registry.access.redhat.com/rhel7",
"name": "tmp-pod",
"volumeMounts": [{
"mountPath": "/mountpath",
"name": "volume"
}
]
}
],
"volumes": [{
"name": "volume",
"persistentVolumeClaim": {
"claimName": "pv-clain"
}
}
]
}
}