Metrics Server

Collect Resource Metrics from Kubelets

Configuration

Deployment

Deploy 2 instances of Metrics server.
Create a service account.
Enable pod security policy.

Helm Values

replicas: 2

rbac:
  pspEnabled: true

Others

Set anti affinity rules.
Deploy Metrics server on control plane nodes.
Set tolerations to control plane taints.
Use priority class system-cluster-critical.

Helm Values

affinity:
  podAntiAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
    - labelSelector:
        matchExpressions:
        - key: app.kubernetes.io/name
          operator: In
          values:
          - traefik
      topologyKey: kubernetes.io/hostname

nodeSelector:
  node-role.kubernetes.io/control-plane: "true"

tolerations:
- key: CriticalAddonsOnly
  operator: Exists
  effect: NoExecute

priorityClassName: "system-cluster-critical"

Installation

Create a file named metrics-server.values.yaml with the following content.

replicas: 2

rbac:
  pspEnabled: true

affinity:
  podAntiAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
    - labelSelector:
        matchExpressions:
        - key: app.kubernetes.io/name
          operator: In
          values:
          - metrics-server
      topologyKey: kubernetes.io/hostname

nodeSelector:
  node-role.kubernetes.io/control-plane: "true"

tolerations:
- key: CriticalAddonsOnly
  operator: Exists
  effect: NoExecute

priorityClassName: system-cluster-critical

Install the Metrics server with this command.

helm install --namespace kube-system --values ./metrics-server.values.yaml metrics-server metrics-server/metrics-server