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kubernetes - Kubernetes 指标服务器无法完全抓取指标

问题描述

当我尝试使用时kubectl top nodes，出现此错误：

Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)

但是 heapster 已被弃用，我使用的是 kubernetes 1.11。我安装了metrics-server，但仍然遇到同样的错误，当我尝试检查metrics-server的日志时，我看到了这个错误：

E1019 12:33:55.621691       1 manager.go:102] unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:elegant-ardinghelli-ei3: unable to fetch metrics from Kubelet elegant-ardinghelli-ei3 (elegant-ardinghelli-ei3):
Get https://elegant-ardinghelli-ei3:10250/stats/summary/: dial tcp: lookup elegant-ardinghelli-ei3 on 10.245.0.10:53: no such host, unable to fully scrape metrics from source kubelet_summary:elegant-ardinghelli-aab: unable to fetch metrics from Kubelet elegant-ardinghelli-aab (elegant-ardinghelli-aab):
Get https://elegant-ardinghelli-aab:10250/stats/summary/: dial tcp: lookup elegant-ardinghelli-aab on 10.245.0.10:53: no such host, unable to fully scrape metrics from source kubelet_summary:elegant-ardinghelli-e4z: unable to fetch metrics from Kubelet elegant-ardinghelli-e4z (elegant-ardinghelli-e4z):
Get https://elegant-ardinghelli-e4z:10250/stats/summary/: dial tcp: lookup elegant-ardinghelli-e4z on 10.245.0.10:53: no such host, unable to fully scrape metrics from source kubelet_summary:elegant-ardinghelli-e41: unable to fetch metrics from Kubelet elegant-ardinghelli-e41 (elegant-ardinghelli-e41):
Get https://elegant-ardinghelli-e41:10250/stats/summary/: dial tcp: lookup elegant-ardinghelli-e41 on 10.245.0.10:53: no such host, unable to fully scrape metrics from source kubelet_summary:elegant-ardinghelli-ein: unable to fetch metrics from Kubelet elegant-ardinghelli-ein (elegant-ardinghelli-ein): 
Get https://elegant-ardinghelli-ein:10250/stats/summary/: dial tcp: lookup elegant-ardinghelli-ein on 10.245.0.10:53: no such host, unable to fully scrape metrics from source kubelet_summary:elegant-ardinghelli-aar: unable to fetch metrics from Kubelet elegant-ardinghelli-aar (elegant-ardinghelli-aar):
Get https://elegant-ardinghelli-aar:10250/stats/summary/: dial tcp: lookup elegant-ardinghelli-aar on 10.245.0.10:53: no such host, unable to fully scrape metrics from source kubelet_summary:elegant-ardinghelli-aaj: unable to fetch metrics from Kubelet elegant-ardinghelli-aaj (elegant-ardinghelli-aaj):
Get https://elegant-ardinghelli-aaj:10250/stats/summary/: dial tcp: lookup elegant-ardinghelli-aaj on 10.245.0.10:53: no such host, unable to fully scrape metrics from source kubelet_summary:elegant-ardinghelli-e49: unable to fetch metrics from Kubelet elegant-ardinghelli-e49 (elegant-ardinghelli-e49):
Get https://elegant-ardinghelli-e49:10250/stats/summary/: dial tcp: lookup elegant-ardinghelli-e49 on 10.245.0.10:53: no such host]

标签： kubernetes

解决方案

在此报道。

Github 问题：

此 PR 实现了对 kubectl top 命令的支持，以将 metrics-server 用作聚合 API，而不是直接从 heapster 请求指标。如果 apiserver 不提供 metrics.k8s.io API，那么这仍然会退回到以前的行为。

合并在https://github.com/kubernetes/kubernetes/pull/56206

可能在 1.12 中修复或计划在下一个版本中。

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