prometheus operator federation

全世界都告诉你修改 prometheus 的配置文件，把联邦的部分添加进去就好了。但我的是通过 operator 部署的丫。连 prometheus 配置文件的 configmap 都木有，那咋改文件文件呢？ 难道我不属于全世界？

prometheus 通过 prometheus-operator 配置的，怎么样配置联邦呢？

先来个官网看看什么是联邦：

Federation | Prometheushttps://prometheus.io/docs/prometheus/latest/federation/

operator 添加 prometheus 的配置，这就是关键了，弄一个 secret，添加到 prometheus 的 cr 里面

prometheus-operator/additional-scrape-config.md at main · prometheus-operator/prometheus-operator · GitHubhttps://github.com/prometheus-operator/prometheus-operator/blob/main/documentation/additional-scrape-config.md

结合一下：

vi prometheus-additional.yaml

- job_name: 'federate'
  scrape_interval: 15s

  honor_labels: true
  metrics_path: '/federate'

  params:
    'match[]':
    #- '{job="prometheus"}'
    #- '{__name__=~"job:.*"}' 
    # 纯粹测试，所以简单粗暴，正儿八经的环境上可别这样
    - '{job!=""}'

  static_configs:
    - targets: ['172.30.3.229:9090']
      # 添加额外的 label， metrics-name{k8scluster="cluster-172.30.3.229"}
      labels:
        k8scluster: cluster-172.30.3.229
    - targets: ['172.30.3.230:9090']
      labels:
        k8scluster: cluster-172.30.3.230

其他按照文档继续操作下去就好了。

再来个可用的 dashboard

Kubernetes cluster monitoring (Prometheus) dashboard for Grafana | Grafana LabsMonitors Kubernetes cluster using Prometheus. Shows overall cluster CPU / Memory / Filesystem usage as well as individual pod, containers, systemd services...https://grafana.com/grafana/dashboards/7550