kubeasz/docs/guide/metrics-server.md

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# Metrics Server
从 v1.8 开始,资源使用情况的度量(如容器的 CPU 和内存使用)可以通过 Metrics API 获取;前提是集群中要部署 Metrics Server它从Kubelet 公开的Summary API采集指标信息关于更多的背景介绍请参考如下文档
- Metrics Server[设计提案](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/instrumentation/metrics-server.md)
大致是说它符合k8s的监控架构设计受heapster项目启发并且比heapster优势在于访问不需要apiserver的代理机制提供认证和授权等很多集群内组件依赖它HPA,scheduler,kubectl top因此它应该在集群中默认运行部分k8s集群的安装工具已经默认集成了Metrics Server的安装以下概述下它的安装
- 1.metric-server是扩展的apiserver依赖于[kube-aggregator](https://github.com/kubernetes/kube-aggregator)因此需要在apiserver中开启相关参数。
- 2.需要在集群中运行deployment处理请求
从kubeasz 0.1.0 开始metrics-server已经默认集成安装请查看`/etc/kubeasz/clusters/xxxx/config.yml`中的设置
## 前提
- 1.设置apiserver相关[参数](../../roles/kube-master/templates/kube-apiserver.service.j2)
``` bash
... # 省略
--requestheader-client-ca-file={{ ca_dir }}/ca.pem \
--requestheader-allowed-names=aggregator \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-group-headers=X-Remote-Group \
--requestheader-username-headers=X-Remote-User \
--proxy-client-cert-file={{ ca_dir }}/aggregator-proxy.pem \
--proxy-client-key-file={{ ca_dir }}/aggregator-proxy-key.pem \
--enable-aggregator-routing=true \
```
- 2.生成[aggregator proxy相关证书](../../roles/kube-master/tasks/main.yml)
参考1https://kubernetes.io/docs/tasks/access-kubernetes-api/configure-aggregation-layer/
参考2https://kubernetes.io/docs/tasks/access-kubernetes-api/setup-extension-api-server/
## 安装
``` bash
# 默认已经集成安装假设集群名为xxxx
ezctl setup xxxx all
# 如果需要分步安装
ezctl setup xxxx 07
# 如果需要手动安装
kubectl apply -f /etc/kubeasz/clusters/xxxx/yml/metrics-server.yaml
```
## 验证
- 查看生成的新apiv1beta1.metrics.k8s.io
``` bash
$ kubectl get apiservice|grep metrics
v1beta1.metrics.k8s.io 1d
```
- 查看kubectl top命令无需额外安装heapster
``` bash
$ kubectl top node
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
192.168.1.1 116m 2% 2342Mi 60%
192.168.1.2 79m 1% 1824Mi 47%
192.168.1.3 82m 2% 1897Mi 49%
$ kubectl top pod --all-namespaces # 输出略
```
- 验证基于metrics-server实现的基础hpa自动缩放请参考[hpa.md](hpa.md)