IdleNode Recommendation

Introduce for IdleNode Recommendation

  less than a minute  

By scanning the status and utilization of nodes, the idle node recommendation helps users to find idle Kubernetes nodes.

Motivation

In Kubernetes cluster, some nodes often idle due to such factors as node taint, label selector, low packing rate and low utilization rate, which wastes a lot of costs. IdleNode recommendation tries to help users find these nodes to reduce cost.

Sample

kind: Recommendation
apiVersion: analysis.crane.io/v1alpha1
metadata:
  name: idlenodes-rule-idlenode-5jxn9
  namespace: crane-system
  labels:
    analysis.crane.io/recommendation-rule-name: idlenodes-rule
    analysis.crane.io/recommendation-rule-recommender: IdleNode
    analysis.crane.io/recommendation-rule-uid: 8921a198-7082-11ed-8b7b-246e960a8d8c
    analysis.crane.io/recommendation-target-kind: Node
    analysis.crane.io/recommendation-target-name: worker-node-1
    analysis.crane.io/recommendation-target-version: v1
    beta.kubernetes.io/arch: amd64
    beta.kubernetes.io/instance-type: bareMetal
    beta.kubernetes.io/os: linux
  ownerReferences:
    - apiVersion: analysis.crane.io/v1alpha1
      kind: RecommendationRule
      name: idlenodes-rule
      uid: 8921a198-7082-11ed-8b7b-246e960a8d8c
      controller: false
      blockOwnerDeletion: false
spec:
  targetRef:
    kind: Node
    name: worker-node-1
    apiVersion: v1
  type: IdleNode
  completionStrategy: {}
status:
  targetRef: {}
  action: Delete
  lastUpdateTime: '2022-11-30T07:46:57Z'

In this sample：

  • Recommendation’s TargetRef Point to Node：worker-node-1
  • Recommendation type is IdleNode
  • action is Delete，but offline a node is a complicated operation, we only give recommended advise.

How to create a IdleNode recommendation please refer to：Recommendation Framework

Implement

Perform the following steps to complete a recommendation process for idle nodes:

  1. Scan all nodes and pods in the cluster
  2. If all Pods on a node are DaemonSet pods, the node is considered to be idle