永久地址:
Kubernetes Monitoring — Metrics Server
(保存网址不迷路 🙃)
问题描述
该笔记将记录:在 Kubernetes Cluster 中,如何部署 Metrics Server 服务,以及常见问题处理。
解决方案
我们的测试环境为 Kubernetes Cluster v1.16 版本。
第一步、环境检查
Metrics Server 对网络和集群有特殊要求。这样要求在某些集群里不是默认配置,所以要先确认是否满足要求。
1)Metrics Server must be reachable from kube-apiserver
2)The kube-apiserver must be correctly configured to enable an aggregation layer
检查 /etc/kubernetes/manifests/kube-apiserver.yaml 选项,默认已经开启。
3)Nodes must have kubelet authorization configured to match Metrics Server configuration
4)Container runtime must implement a container metrics RPCs
第二步、修改配置信息
下载
components.yaml
文件,并根据需要进行修改:
1)我们需要修改在 YAML 文件中的镜像地址,使用私有镜像仓库;
2)添加 –kubelet-preferred-address-types=InternalIP 与 –kubelet-insecure-tls 选项;
第三步、应用配置文件
# kubectl apply -f "/path/to/components.yaml" # kubectl get -n kube-system pods -l k8s-app=metrics-server NAME READY STATUS RESTARTS AGE metrics-server-66d4d747c4-nmzs6 1/1 Running 0 8m19s
第四步、查看 Pod 资源占用情况
# kubectl top node --sort-by=cpu ... # kubectl top pod --all-namespaces --containers ...
常见错误汇总
Metrics not available for pod
# kubectl top -n kube-system pod W0702 10:48:07.400630 6619 top_pod.go:266] Metrics not available for pod kube-system/coredns-58cc8c89f4-6czm4, age: 4267h8m49.400600321s error: Metrics not available for pod kube-system/coredns-58cc8c89f4-6czm4, age: 4267h8m49.400600321s
通过添加 –kubelet-preferred-address-types=InternalIP 与 –kubelet-insecure-tls 选项解决;
unable to fetch pod metrics for pod
E0702 02:39:09.777832 1 reststorage.go:160] unable to fetch pod metrics for pod default/counter: no metrics known for pod E0702 02:39:09.777843 1 reststorage.go:160] unable to fetch pod metrics for pod kube-system/etcd-k8s-master-02: no metrics known for pod E0702 02:39:09.777863 1 reststorage.go:160] unable to fetch pod metrics for pod kube-system/fluentd-p6d29: no metrics known for pod E0702 02:39:09.777874 1 reststorage.go:160] unable to fetch pod metrics for pod kube-system/kube-proxy-xdh2z: no metrics known for pod E0702 02:39:09.777885 1 reststorage.go:160] unable to fetch pod metrics for pod kube-system/etcd-k8s-master-01: no metrics known for pod E0702 02:39:09.777900 1 reststorage.go:160] unable to fetch pod metrics for pod kube-system/kube-proxy-jrpnd: no metrics known for pod
通过添加 –kubelet-preferred-address-types=InternalIP 与 –kubelet-insecure-tls 选项解决;
相关文章
「Kubernetes」- 部署 Prometheus 监控
「Kubernetes Monitoring」- Heapster
「Metrics Server」- components.yaml
参考文献
Kubernetes metrics-server Installation
Installing the Kubernetes Metrics Server
Kubernetes Metrics unable to fetch pod/node metrics – Stack Overflow
Installing the Kubernetes Metrics Server – Amazon EKS
Configure the Aggregation Layer – Kubernetes