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【2020.07.06】kube-prometheus中如何添加新scrape api？

本文轉載自   查看原文   2020-07-06 19:25   531 

上一篇博客中，有說到用kube-prometheus安裝prometheus全家桶，用來監控，其中演示了如何通過配置文件的形式來添加，它有點不好的地方，就要修改，可能還需要重啟，不是自動的，不是特別方便。


下面介紹一個它自動服務發現的方式：

prometheus-operator

自動發現scrape api主要得力於prometheus-operator這個項目，這個項目是方便管理prometheus在k8s集群中的自定義資源、配置、監控對象等，十分的方便。

image

其中，自定義資源ServiceMonitor它就能自動的獲取到符合要求的metrics指標

自定義ServiceMonitor實現metrics指標自動獲取（場景1）

  • 此方法適用於，你暴露metrics的service的namespace在monitoring下的

  • service中，添加annotations

    1. image
    2. 上面2個key，就是約定的，必須要有的，這樣才能自動探測到，注意port要和service保持 一致

  • 新增servicemonitor定義

    • image

  • 驗證

    • image
    • 至此就自動發現了，成功！
  • 附上完整文件
      •   1 apiVersion: apps/v1
  2 kind: Deployment
  3 metadata:
  4   name: rabbitmq-exporter-auto
  5   namespace: monitoring
  6   labels:
  7     app: rabbitmq-exporter-auto
  8     author: jamestao
  9 spec:
 10   replicas: 1
 11   selector:
 12     matchLabels:
 13       app: rabbitmqpod-auto
 14   template:
 15     metadata:
 16       name: rabbitmq-exporter-pod-auto
 17       labels:
 18         app: rabbitmqpod-auto
 19     spec:
 20       restartPolicy: Always
 21       containers:
 22         - name: rabbitmq-exporter-container-auto
 23           image: kbudde/rabbitmq-exporter:latest
 24           resources:
 25             requests:
 26               memory: 10Mi
 27           ports:
 28             - containerPort: 9419
 29           env:
 30             - name: RABBIT_URL
 31               value: http://192.168.26.91:15672
 32             - name: RABBIT_USER
 33               value: james
 34             - name: RABBIT_PASSWORD
 35               value: "666666"
 36             - name: INCLUDE_VHOST
 37               value: ".*"
 38             - name: INCLUDE_QUEUES
 39               value: ".*"
 40 ---
 41 apiVersion: v1
 42 kind: Service
 43 metadata:
 44   name: svc-rabbitmq-management-auto
 45   labels:
 46     app: rabbitmq-exporter-svc-auto
 47   namespace: monitoring
 48   annotations:
 49     prometheus.io/port: "39418"
 50     prometheus.io/scrape: "true"
 51 spec:
 52   selector:
 53     app: rabbitmqpod-auto
 54   ports:
 55     - protocol: TCP
 56       port: 39418
 57       targetPort: 9419
 58       name: metrics
 59 ---
 60 apiVersion: monitoring.coreos.com/v1
 61 kind: ServiceMonitor
 62 metadata:
 63   name: taozhiqiang
 64   namespace: monitoring
 65 spec:
 66   endpoints:
 67   - interval: 15s
 68     port: metrics
 69   namespaceSelector:
 70     matchNames:
 71     - monitoring
 72   selector:
 73     matchLabels:
 74       app: rabbitmq-exporter-svc-auto
      rabbitmq_exporter_auto.yaml

自定義ServiceMonitor實現metrics指標自動獲取（場景2）

  • 此方法適用於，你暴露metrics的service的namespace不在monitoring下(kube-prometheus它默認安裝在monitoring)，不在monitoring下的server想要被prometheus-operator所探測到，需要創建sa權限綁定。
  • 主要需要新增這2節：image
  • 附上完整文件： 
      1 apiVersion: apps/v1
  2 kind: Deployment
  3 metadata:
  4   name: rabbitmq-exporter-auto
  5   namespace: bookstore
  6   labels:
  7     app: rabbitmq-exporter-auto
  8     author: jamestao
  9 spec:
 10   replicas: 1
 11   selector:
 12     matchLabels:
 13       app: rabbitmqpod-auto
 14   template:
 15     metadata:
 16       name: rabbitmq-exporter-pod-auto
 17       labels:
 18         app: rabbitmqpod-auto
 19     spec:
 20       restartPolicy: Always
 21       containers:
 22         - name: rabbitmq-exporter-container-auto
 23           image: kbudde/rabbitmq-exporter:latest
 24           resources:
 25             requests:
 26               memory: 10Mi
 27           ports:
 28             - containerPort: 9419
 29           env:
 30             - name: RABBIT_URL
 31               value: http://192.168.26.91:15672
 32             - name: RABBIT_USER
 33               value: james
 34             - name: RABBIT_PASSWORD
 35               value: "666666"
 36             - name: INCLUDE_VHOST
 37               value: ".*"
 38             - name: INCLUDE_QUEUES
 39               value: ".*"
 40 ---
 41 apiVersion: v1
 42 kind: Service
 43 metadata:
 44   name: svc-rabbitmq-management-auto
 45   labels:
 46     app: rabbitmq-exporter-svc-auto
 47   namespace: bookstore
 48   annotations:
 49     prometheus.io/port: "39418"
 50     prometheus.io/scrape: "true"
 51 spec:
 52   selector:
 53     app: rabbitmqpod-auto
 54   ports:
 55     - protocol: TCP
 56       port: 39418
 57       targetPort: 9419
 58       name: metrics
 59 ---
 60 apiVersion: monitoring.coreos.com/v1
 61 kind: ServiceMonitor
 62 metadata:
 63   name: taozhiqiang-auto
 64   namespace: monitoring
 65 spec:
 66   endpoints:
 67   - interval: 15s
 68     port: metrics
 69   namespaceSelector:
 70     matchNames:
 71     - bookstore
 72   selector:
 73     matchLabels:
 74       app: rabbitmq-exporter-svc-auto
 75 ---
 76 apiVersion: rbac.authorization.k8s.io/v1
 77 kind: RoleList
 78 items:
 79 - apiVersion: rbac.authorization.k8s.io/v1
 80   kind: Role
 81   metadata:
 82     name: prometheus-k8s-rabbitmq
 83     namespace: bookstore
 84   rules:
 85   - apiGroups:
 86     - ""
 87     resources:
 88     - services
 89     - endpoints
 90     - pods
 91     verbs:
 92     - get
 93     - list
 94     - watch
 95 ---
 96 apiVersion: rbac.authorization.k8s.io/v1
 97 kind: RoleBindingList
 98 items:
 99 - apiVersion: rbac.authorization.k8s.io/v1
100   kind: RoleBinding
101   metadata:
102     name: prometheus-k8s-rabbitmq
103     namespace: bookstore
104   roleRef:
105     apiGroup: rbac.authorization.k8s.io
106     kind: Role
107     name: prometheus-k8s-rabbitmq
108   subjects:
109   - kind: ServiceAccount
110     name: prometheus-k8s
111     namespace: monitoring
    rabbitmq_exporter_auto_out_monitoring.yaml

2種場景請仔細閱讀文件信息，對比下差異，就好理解了。

ServiceMonitor機制圖


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