多个 kube-shcedulers

Question

我正在尝试创建一个 kube-shceduler，供我的组织 pod 部署（数据中心）使用。目标是让任何部署的 pod 在数据中心的两个站点之间平均分配。为了存档，我创建了一个新的 kube-shceduler 清单（见下文），在其中我更改了使用的端口并使用 --config 参数添加了一个新的配置文件（见下文）。问题是，即使将 --port 参数设置为原始 kube-scheduler 尚未使用的新端口，它仍会尝试使用旧端口。因此新的 kube 调度器无法启动：

I1109 20:27:59.225996       1 registry.go:173] Registering SelectorSpread plugin
I1109 20:27:59.226097       1 registry.go:173] Registering SelectorSpread plugin
I1109 20:27:59.926994       1 serving.go:331] Generated self-signed cert in-memory
failed to create listener: failed to listen on 0.0.0.0:10251: listen tcp 0.0.0.0:10251: bind: address already in use

如何强制使用指定的端口，或者如何删除原来的 kube-scheduler，这样两者之间就不会发生冲突。第一个解决方案会更好。

配置 kube-scheduler (manifest - /etc/kubernetes/manifest/kube-scheduler.yaml)：

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    component: kube-scheduler
    tier: control-plane
  name: kube-scheduler
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-scheduler
    - --authentication-kubeconfig=/etc/kubernetes/scheduler.conf
    - --authorization-kubeconfig=/etc/kubernetes/scheduler.conf
    - --bind-address=127.0.0.1
    - --kubeconfig=/etc/kubernetes/scheduler.conf
    - --leader-elect=true
      #- --port=0
    image: k8s.gcr.io/kube-scheduler:v1.19.3
    imagePullPolicy: IfNotPresent
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 127.0.0.1
        path: /healthz
        port: 10259
        scheme: HTTPS
      initialDelaySeconds: 10
      periodSeconds: 10
      timeoutSeconds: 15
    name: kube-scheduler
    resources:
      requests:
        cpu: 100m
    startupProbe:
      failureThreshold: 24
      httpGet:
        host: 127.0.0.1
        path: /healthz
        port: 10259
        scheme: HTTPS
      initialDelaySeconds: 10
      periodSeconds: 10
      timeoutSeconds: 15
    volumeMounts:
    - mountPath: /etc/kubernetes/scheduler.conf
      name: kubeconfig
      readOnly: true
  hostNetwork: true
  priorityClassName: system-node-critical
  volumes:
  - hostPath:
      path: /etc/kubernetes/scheduler.conf
      type: FileOrCreate
    name: kubeconfig
status: {}

配置 kube-custom-scheduler.yaml (/etc/kubernetes/manifest/kube-custom-scheduler.yaml)：

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    component: kube-custom-scheduler
    tier: control-plane
  name: kube-custom-scheduler
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-scheduler 
    - --config=/etc/kubernetes/scheduler-custom.conf
    - --master=true
    - --authentication-kubeconfig=/etc/kubernetes/scheduler.conf
    - --authorization-kubeconfig=/etc/kubernetes/scheduler.conf
    - --bind-address=127.0.0.1
    - --kubeconfig=/etc/kubernetes/scheduler.conf
    - --leader-elect=false
    - --secure-port=10269
    - --scheduler-name=kube-custom-shceduler
    - --port=10261
    image: k8s.gcr.io/kube-scheduler:v1.19.3
    imagePullPolicy: IfNotPresent
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 127.0.0.1
        path: /healthz
        port: 10269
        scheme: HTTPS
      initialDelaySeconds: 10
      periodSeconds: 10
      timeoutSeconds: 15
    name: kube-scheduler
    resources:
      requests:
        cpu: 100m
    startupProbe:
      failureThreshold: 24
      httpGet:
        host: 127.0.0.1
        path: /healthz
        port: 10269
        scheme: HTTPS
      initialDelaySeconds: 10
      periodSeconds: 10
      timeoutSeconds: 15
    volumeMounts:
    - mountPath: /etc/kubernetes/scheduler.conf
      name: kubeconfig
      readOnly: true
    - mountPath: /etc/kubernetes/scheduler-custom.conf
      name: customconfig
      readOnly: true
  hostNetwork: true
  priorityClassName: system-node-critical
  volumes:
  - hostPath:
      path: /etc/kubernetes/scheduler.conf
      type: FileOrCreate
    name: kubeconfig
  - hostPath:
      path: /etc/kubernetes/scheduler-custom.conf
      type: FileOrCreate
    name: customconfig 
status: {}

kube-custom-scheduler.yaml（/etc/kubernetes/scheduler-custom.conf）中提到的自定义配置：

apiVersion: kubescheduler.config.k8s.io/v1beta1
kind: KubeSchedulerConfiguration

profiles:
  - pluginConfig:
      - name: PodTopologySpread
        args:
          defaultConstraints:
            - maxSkew: 1
              topologyKey: topology.kube.io/datacenter 
              whenUnsatisfiable: ScheduleAnyway 

如果您需要有关集群的更多信息，请不要犹豫。

Answer 1

根据https://kubernetes.io/docs/reference/command-line-tools-reference/kube-scheduler/，--port 将被--config 指定的文件覆盖。将HealthzBindAddress 和MetricsBindAddress 添加到/etc/kubernetes/scheduler-custom.conf 有效：

healthzBindAddress: 0.0.0.0:10261
metricsBindAddress: 0.0.0.0:10261

如果要移除默认调度器，可以将kube-scheduler.yaml移出/etc/kubernetes/manifests/。