[Kubernetes] Monitor Persistent Volume usage in Kubernetes using Prometheus

Hôm nay thì mình muốn monitor usage của pv

https://github.com/antonputra/tutorials/tree/main/lessons/134

What is the kubelet

Yes, I know about the kubelet in Kubernetes (k8s). The kubelet is the primary “node agent” that runs on each node in a Kubernetes cluster. It can register the node with the apiserver using one of several methods: the hostname, a flag to override the hostname, or specific logic for a cloud provider¹. The kubelet works in terms of a PodSpec, which is a YAML or JSON object that describes a pod. The kubelet takes a set of PodSpecs that are provided through various mechanisms (primarily through the apiserver) and ensures that the containers described in those PodSpecs are running and healthy¹. Is there anything else you would like to know about the kubelet or Kubernetes? 😊

giờ bạn thực hiện cài kube-state-metrics

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update
helm install [RELEASE_NAME] prometheus-community/kube-state-metrics [flags]

The kubelet collects this information from the volume plugins that have implemented metrics². As of Kubernetes 1.7, the current volume plugins that have implemented metrics include: emptydir, secrets, gce pd, aws ebs, azure file, flocker, and portworx². This metric can be used to monitor the disk usage of persistent volumes in a Kubernetes cluster.

PromQL:

Kubelet Volume Stats Capacity

kubelet_volume_stats_capacity_bytes{cluster_name="$cluster"}

Kubelet: Used Bytes of Volumes

kubelet_volume_stats_used_bytes{cluster_name="$cluster"}

Kubelet: Used Percentage of Volumes

kubelet_volume_stats_used_bytes{cluster_name="$cluster"}
/
kubelet_volume_stats_capacity_bytes{cluster_name="$cluster"}