PV Recommendation

Introduce for PV Recommendation

  2 minute read  

PV recommendation scans the running status of PVs in the cluster to help users find idle Kubernetes PVs.

Motivation

In Kubernetes, we usually use PV + Workload to automatically create and manage storage volumes and attach them to applications. However, in daily operations, idle or unused storage volumes may inevitably occur, wasting a lot of costs. PV recommendation tries to help users find these PVs to achieve cost optimization.

Sample

apiVersion: analysis.crane.io/v1alpha1
kind: Recommendation
metadata:
  annotations:
    analysis.crane.io/last-start-time: "2023-06-14 08:55:25"
    analysis.crane.io/message: Success
    analysis.crane.io/run-number: "653"
  labels:
    analysis.crane.io/recommendation-rule-name: persistentvolumes-rule
    analysis.crane.io/recommendation-rule-recommender: Volume
    analysis.crane.io/recommendation-rule-uid: 39d30abe-4c7f-4e65-b961-b00ec7776b45
    analysis.crane.io/recommendation-target-kind: PersistentVolume
    analysis.crane.io/recommendation-target-name: pvc-6ce24277-24e9-4fcf-8e8a-f9bdb5694134
    analysis.crane.io/recommendation-target-namespace: ""
    analysis.crane.io/recommendation-target-version: v1
  name: persistentvolumes-rule-volume-5r9zn
  namespace: crane-system
  ownerReferences:
    - apiVersion: analysis.crane.io/v1alpha1
      blockOwnerDeletion: false
      controller: false
      kind: RecommendationRule
      name: persistentvolumes-rule
      uid: 39d30abe-4c7f-4e65-b961-b00ec7776b45
spec:
  adoptionType: StatusAndAnnotation
  completionStrategy:
    completionStrategyType: Once
  targetRef:
    apiVersion: v1
    kind: PersistentVolume
    name: pvc-6ce24277-24e9-4fcf-8e8a-f9bdb5694134
  type: Volume
status:
  action: Delete
  description: It is an Orphan Volumes
  lastUpdateTime: "2023-06-14T08:55:25Z"

In this sample:

  • The recommended TargetRef points to PV: pvc-6ce24277-24e9-4fcf-8e8a-f9bdb5694134
  • The recommendation type is PV recommendation
  • The action is to Delete, and it is only a suggestion provided here.

Implement

PV recommendation completes a recommendation process using the following steps:

  1. Scan all PVs in the cluster and find the list of Pods corresponding to each PV.
  2. If the PV does not have a corresponding PVC, it is considered an idle PV.
  3. If no Pods are associated with this PV and PVC, it is considered an idle PVC.

Configuration

Currently, there is no parameter configuration for PV recommendation.

How to update recommendation configuration please refer to：Recommendation Framework