'What does Kubelet use to determine the ephemeral-storage capacity of the node?

I have Kubernetes cluster running on a VM. A truncated overview of the mounts is:

$ df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/sda1                      20G  4.5G   15G  24% /
/dev/mapper/vg001-lv--docker  140G   33G  108G  23% /var/lib/docker

As you can see, I added an extra disk to store the docker images and its volumes. However, when querying the node's capacity, the following is returned

Capacity:
  cpu:                12
  ephemeral-storage:  20145724Ki
  hugepages-1Gi:      0
  hugepages-2Mi:      0
  memory:             65831264Ki
  nvidia.com/gpu:     1
  pods:               110

ephemeral-storage is 20145724Ki which is 20G, referring to the disk mounted at /.

How does Kubelet calculate its ephemeral-storage? Is it simply looking at the disk space available at /? Or is it looking at another folder like /var/log/containers?

This is a similar post where the user eventually succumbed to increasing the disk mounted at /.

kuberneteskubelet


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