如何计算 kubernetes 节点上的磁盘使用率？

Question

I have a service on my kubernetes cluster that generates massive assets to my machine's hard disk. Some of that information could also be served statically by a different service in my system. The save location is mapped to an actual folder on my disk.

I already found that I can see some information about my "ephemral" storage capacity and allocatbility through kubectl describe node but the data doesn't align with what I see when I run df -h on my machine's terminal. on the node, I can see that I could allocate 147GB and on my terminal I can see that I could only allocate 98GB (this means we probably have some reserved space by Kubernetes in our deployments). I would like my metrics to reflect the actual state of the hard drive.

My Question:
How do I check through Kubernetes's python package what's the status of the storage on my machine without mounting my root path into the relevant container ? Is there an API to the metrics service that shows me the status of my machine's actual storage? I tried looking at the Python API and couldn't find it. What am I missing?

Answer 1

Kubernetes does not track overall storage available. It only knows things about emptyDir volumes and the filesystem backing those. If you're using a hostPath mount (which it sounds like you are), that is outside of Kube's view of the world. You can use something like node_exporter to gather those statistics yourself.