Podstate

Overview #

This folder holds a sample plugin implementation based on the number of terminating and nominated Pods on a Node.

Maturity Level #

  • 💡 Sample (for demonstrating and inspiring purpose)
  • 👶 Alpha (used in companies for pilot projects)
  • 👦 Beta (used in companies and developed actively)
  • 👨 Stable (used in companies for production workloads)

Pod State Plugin #

This is a score plugin that takes terminating and nominated Pods into accounts in the following manner:

  • the nodes that have more terminating Pods will get a higher score as those terminating Pods would be physically removed eventually from nodes
  • the nodes that have more nominated Pods (which carry .status.nominatedNodeName) will get a lower score as the nominated nodes are supposed to accommodate some preemptor pod in a future scheduling cycle.

Example config: # 

apiVersion: kubescheduler.config.k8s.io/v1
kind: KubeSchedulerConfiguration
leaderElection:
  leaderElect: false
clientConnection:
  kubeconfig: "REPLACE_ME_WITH_KUBE_CONFIG_PATH"
profiles:
- schedulerName: default-scheduler
  plugins:
    score:
      enabled:
      - name: PodState