mirror of https://github.com/easzlab/kubeasz.git
65 lines
2.9 KiB
Markdown
65 lines
2.9 KiB
Markdown
# 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
|
||
- 参考:https://github.com/kubernetes-sigs/metrics-server
|
||
|
||
## 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1:https://kubernetes.io/docs/tasks/access-kubernetes-api/configure-aggregation-layer/
|
||
参考2:https://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api:v1beta1.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)
|