Kubernetes - Increase metrics-server resources (cpu/memory)

在 GKE 中，如果 metrics-server 因為資源不足崩潰，可以透過更改 NannyConfiguration 和刪除 Deployment: metric-server 來改善這個問題。

> kubectl top pod
W0309 18:40:25.910477   53595 top_pod.go:274] Metrics not available for pod default/xxxx, age: 536h37m25.91045s
error: Metrics not available for pod default/xxxx, age: 536h37m25.91045s

Environment:

  • Kubernetes: v1.17.15-gke.800

範例

> kubectl apply -f metrics-server-config.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    addonmanager.kubernetes.io/mode: EnsureExists
    kubernetes.io/cluster-service: "true"
  name: metrics-server-config
  namespace: kube-system
data:
  NannyConfiguration: |-
    apiVersion: nannyconfig/v1alpha1
    kind: NannyConfiguration
    baseCPU: 200m
    cpuPerNode: 2m
    baseMemory: 150Mi
    memoryPerNode: 4Mi
> kubectl delete deployment -n kube-system metrics-server-v0.3.6
deployment.apps "metrics-server-v0.3.6" deleted

需要 3-5 分鐘，等待 kube-controller-manager 生效，用新的配置產生 Deployment。

Reference