Red Hat build of MicroShift

Monitoring ephemeral storage

Monitor ephemeral storage usage with the /bin/df utility to track disk space consumption on /var/lib/kubelet and /var/lib/containers. Regular monitoring helps you identify storage-hungry workloads and adjust resource limits before kubelet evicts pods due to storage exhaustion.

When you use the df command, the available space for only /var/lib/kubelet is shown if /var/lib/containers is placed on a separate disk by the cluster administrator.

You can use /bin/df as a tool to monitor ephemeral storage usage on the volume where ephemeral container data is located, which is /var/lib/kubelet and /var/lib/containers. The available space for only /var/lib/kubelet is shown when you use the df command if /var/lib/containers is placed on a separate disk by the cluster administrator.

Procedure

To show the human-readable values of used and available space in /var/lib, run the following command:
```
$ df -h /var/lib
```
The output shows the ephemeral storage usage in /var/lib:
Example output
```
Filesystem  Size  Used Avail Use% Mounted on
/dev/disk/by-partuuid/4cd1448a-01    69G   32G   34G  49% /
```