前言

Blackbox Exporter - Prometheus Operator
prometheus-operator
blackbox_exporter/example.yml at master · prometheus/blackbox_exporter
Prometheus Operator + Blackbox exporter | 好好学习的郝

prometheus-operator 中配置 blackbox-exporter

prometheus-operator 将 prometheus 配置抽象为 k8s 的自定义资源 CRD。配置监控目标时，可选的 CRD 包括：
(1) servicemonitors：基于 k8s service、select 机制，发现监控目标，最终由 operator 自动生成 scrape 配置。
例如，kube-prometheus-stack(prometheus-community/helm-chart/kube-prometheus-stack) 自带的 node-exporter。
(2) probes：指定应如何监控 ingress 或 静态目标，最终由 operator 自动生成 scrape 配置。
适用于配置 blackbox-exporter。（查看 CRD probes.monitoring.coreos.com 的定义）
image.png
(3) podmonitors。

但通过上网搜以及实践，确认以下三种方式均可实现对 blackbox-exporter 的配置：

1. additionalScrapeConfigs

在 kube-prometheus-stack 的 helm chart 包的 values.yaml 文件中，开启 additionalScrapeConfigsSecret：

  1.  ## If additional scrape configurations are already deployed in a single secret file you can use this section.
  2.  ## Expected values are the secret name and key
  3.  ## Cannot be used with additionalScrapeConfigs
  4.  additionalScrapeConfigsSecret:
  5.    enabled: true  #开启
  6.    name: additional-configs  #secret名称
  7.    key: prometheus-additional.yaml  #secret key

创建对应的 k8s secret：

  1. $ cat prometheus-additional.yaml
  2. - job_name: blackbox_http_2xx
  3.   metrics_path: /probe
  4.   params:
  5.     module: [http_2xx]
  6.   static_configs:
  7.     - targets:
  8.         - https://www.baidu.com
  9.   relabel_configs:
  10.     - source_labels: [__address__]
  11.       target_label: __param_target
  12.     - source_labels: [__param_target]
  13.       target_label: instance
  14.     - target_label: __address__
  15.       replacement: ${blackbox-exporter-svc:port}
  17. # 新建 secret
  18. $ kubectl -n monitoring create secret generic additional-configs \
  19.     --from-file=prometheus-additional.yaml
  21. # 更新 secret
  22. kubectl -n monitoring create secret generic additional-configs \
  23.     --from-file=prometheus-additional.yaml --dry-run=client -o yaml | kubectl apply -f -

配置生效：
image.png

2. serviceMonitorSpec.endpoints

from: Prometheus Operator + Blackbox exporter | 好好学习的郝 

  1. apiVersion: monitoring.coreos.com/v1
  2. kind: ServiceMonitor
  3. metadata:
  4.   labels:
  5.     name: blackbox-exporter
  6.     release: prometheus
  7.   name: blackbox-exporter
  8.   namespace: monitoring
  9. spec:
  10.   namespaceSelector:
  11.     matchNames:
  12.     - monitoring
  13.   selector:
  14.     matchLabels:
  15.       name: blackbox-exporter
  16.   endpoints:
  17.   - interval: 15s
  18.     port: http-metrics
  19.     path: /probe
  20.     relabelings:
  21.     - action: replace
  22.       regex: (.*)
  23.       replacement: $1
  24.       sourceLabels:
  25.       - __meta_kubernetes_service_label_cluster
  26.       targetLabel: cluster
  27.     - action: replace
  28.       regex: (.*)
  29.       replacement: $1
  30.       sourceLabels:
  31.       - __param_module
  32.       targetLabel: module
  33.     - action: replace
  34.       regex: (.*)
  35.       replacement: $1
  36.       sourceLabels:
  37.       - __param_target
  38.       targetLabel: target
  39.     params:
  40.       module:
  41.       - http_2xx
  42.       target:
  43.       - http://prometheus.io

3. probes

创建 probe 资源保存配置：

  1. $ cat probe.yaml
  2. kind: Probe
  3. apiVersion: monitoring.coreos.com/v1
  4. metadata:
  5.   name: probe-website
  6.   namespace: monitoring
  7.   labels:
  8.     release: prometheus
  9. spec:
  10.   interval: 60s
  11.   module: http_2xx
  12.   prober:
  13.     url: blackbox-exporter.default.svc.cluster.local:9115
  14.   targets:
  15.     staticConfig:
  16.       static:
  17.       - https://www.baidu.com
  20. $ kubectl apply -f probe.yaml

配置生效：
image.png