How to identify the storage space left in a persistent volume claim?

If there's a running pod with mounted PV from the PVC,

kubectl -n <namespace> exec <pod-name> -- df -ah

...will list all file systems, including the mounted volumes, and their free disk space.

You can monitorize them with kubelet prometheus metrics:

kubelet_volume_stats_available_bytes{persistentvolumeclaim="your-pvc"}
kubelet_volume_stats_capacity_bytes{persistentvolumeclaim="your-pvc"}

Adding to @apisim's answer if you add -h parameter then you can get details in human readable format. Something like this,

kubectl -n <namespace> exec <pod-name> -- df -h

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I wrote a script that lists all the PVCs in a cluster in a format similar to df.

You can run it via:

./kubedf

or:

./kubedf -h

for a human readable output.

Edit: The script no longer requires kubectl proxy to be running

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