我用的是descheduler，如果不熟悉的人，可以自行百度

创建 configmap.yaml

--- 
apiVersion: v1
kind: ConfigMap
metadata:
  name: descheduler-policy-configmap
  namespace: kube-system
data:
  policy.yaml: |
    apiVersion: "descheduler/v1alpha1"
    kind: "DeschedulerPolicy"
    strategies:
      "RemoveDuplicates":
         enabled: true
      "RemovePodsViolatingInterPodAntiAffinity":
         enabled: true
      "LowNodeUtilization":
         enabled: true
         params:
           nodeResourceUtilizationThresholds:
             thresholds:
               "cpu" : 20
               "memory": 20
               "pods": 20
             targetThresholds:
               "cpu" : 50
               "memory": 50
               "pods": 50

创建 cronjob.yaml

---
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: descheduler-cronjob
  namespace: kube-system
spec:
  schedule: "*/2 * * * *"
  concurrencyPolicy: "Forbid"
  jobTemplate:
    spec:
      template:
        metadata:
          name: descheduler-pod
        spec:
          priorityClassName: system-cluster-critical
          containers:
          - name: descheduler
            image: registry.cn-hangzhou.aliyuncs.com/coolops/descheduler:v0.24.0
            volumeMounts:
            - mountPath: /policy-dir
              name: policy-volume
            command:
              - "/bin/descheduler"
            args:
              - "--policy-config-file"
              - "/policy-dir/policy.yaml"
              - "--v"
              - "3"
          restartPolicy: "Never"
          serviceAccountName: descheduler-sa
          volumes:
          - name: policy-volume
            configMap:
              name: descheduler-policy-configmap

创建 job.yaml

---
apiVersion: batch/v1
kind: Job
metadata:
  name: descheduler-job
  namespace: kube-system
spec:
  parallelism: 1
  completions: 1
  template:
    metadata:
      name: descheduler-pod
    spec:
      priorityClassName: system-cluster-critical
      containers:
        - name: descheduler
          image: registry.cn-hangzhou.aliyuncs.com/coolops/descheduler:v0.24.0
          volumeMounts:
          - mountPath: /policy-dir
            name: policy-volume
          command:
            - "/bin/descheduler"
          args:
            - "--policy-config-file"
            - "/policy-dir/policy.yaml"
            - "--v"
            - "3"
      restartPolicy: "Never"
      serviceAccountName: descheduler-sa
      volumes:
      - name: policy-volume
        configMap:
          name: descheduler-policy-configmap

创建 rbac.yaml

---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: descheduler-cluster-role
  namespace: kube-system
rules:
- apiGroups: [""]
  resources: ["events"]
  verbs: ["create", "update"]
- apiGroups: [""]
  resources: ["nodes"]
  verbs: ["get", "watch", "list"]
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["get", "watch", "list", "delete"]
- apiGroups: [""]
  resources: ["pods/eviction"]
  verbs: ["create"]
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: descheduler-sa
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: descheduler-cluster-role-binding
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: descheduler-cluster-role
subjects:
  - name: descheduler-sa
    kind: ServiceAccount
    namespace: kube-system

分别执行，然后把重新通过jenkins部署服务，观察pod在节点的部署情况