2.5. 在多个命名空间中 Scrape 目标

流程

1. 部署以下命名空间对象和 MonitoringStack YAML 文件：

   MonitoringStack 示例

   apiVersion: v1
   kind: Namespace
   metadata:
     name: ns1-coo
     labels:
       monitoring.rhobs/stack: multi-ns
   ---
   apiVersion: monitoring.rhobs/v1alpha1
   kind: MonitoringStack
   metadata:
     name: example-coo-monitoring-stack
     namespace: ns1-coo
   spec:
     logLevel: debug
     retention: 1d
     resourceSelector:
         matchLabels:
           k8s-app: prometheus-coo-example-monitor
     namespaceSelector:
         matchLabels:
           monitoring.rhobs/stack: multi-ns

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2. 在命名空间 ns1-coo 中部署示例应用程序，其中包含始终会触发的警报：

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     labels:
       app: prometheus-coo-example-app
     name: prometheus-coo-example-app
     namespace: ns1-coo
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: prometheus-coo-example-app
     template:
       metadata:
         labels:
           app: prometheus-coo-example-app
       spec:
         containers:
         - image: ghcr.io/rhobs/prometheus-example-app:0.4.2
           imagePullPolicy: IfNotPresent
           name: prometheus-coo-example-app
   ---
   apiVersion: v1
   kind: Service
   metadata:
     labels:
       app: prometheus-coo-example-app
     name: prometheus-coo-example-app
     namespace: ns1-coo
   spec:
     ports:
     - port: 8080
       protocol: TCP
       targetPort: 8080
       name: web
     selector:
       app: prometheus-coo-example-app
     type: ClusterIP
   ---
   apiVersion: monitoring.rhobs/v1
   kind: ServiceMonitor
   metadata:
     labels:
       k8s-app: prometheus-coo-example-monitor
     name: prometheus-coo-example-monitor
     namespace: ns1-coo
   spec:
     endpoints:
     - interval: 30s
       port: web
       scheme: http
     selector:
       matchLabels:
         app: prometheus-coo-example-app
   ---
   apiVersion: monitoring.rhobs/v1
   kind: PrometheusRule
   metadata:
     name: example-alert
     namespace: ns1-coo
     labels:
       k8s-app: prometheus-coo-example-monitor
   spec:
     groups:
     - name: example
       rules:
       - alert: VersionAlert
         for: 1m
         expr: version{job="prometheus-coo-example-app"} > 0
         labels:
           severity: warning

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3. 在标有 monitoring.rhobs/stack: multi-ns 的另一个命名空间中部署相同的示例应用程序：

   apiVersion: v1
   kind: Namespace
   metadata:
     name: ns2-coo
     labels:
       monitoring.rhobs/stack: multi-ns
   ---
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     labels:
       app: prometheus-coo-example-app
     name: prometheus-coo-example-app
     namespace: ns2-coo
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: prometheus-coo-example-app
     template:
       metadata:
         labels:
           app: prometheus-coo-example-app
       spec:
         containers:
         - image: ghcr.io/rhobs/prometheus-example-app:0.4.2
           imagePullPolicy: IfNotPresent
           name: prometheus-coo-example-app
   ---
   apiVersion: v1
   kind: Service
   metadata:
     labels:
       app: prometheus-coo-example-app
     name: prometheus-coo-example-app
     namespace: ns2-coo
   spec:
     ports:
     - port: 8080
       protocol: TCP
       targetPort: 8080
       name: web
     selector:
       app: prometheus-coo-example-app
     type: ClusterIP
   ---
   apiVersion: monitoring.rhobs/v1
   kind: ServiceMonitor
   metadata:
     labels:
       k8s-app: prometheus-coo-example-monitor
     name: prometheus-coo-example-monitor
     namespace: ns2-coo
   spec:
     endpoints:
     - interval: 30s
       port: web
       scheme: http
     selector:
       matchLabels:
         app: prometheus-coo-example-app

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验证

1. 验证 Prometheus 实例是否已添加新目标，以及警报是否已触发。使用 port-forward 命令公开 Prometheus 或 Monitoringstack 实例部署的 Alertmanager 用户界面。

   Prometheus

   $ oc port-forward -n ns1-coo pod/prometheus-example-coo-monitoring-stack-0 9090

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   Alertmanager

   $ oc port-forward -n ns1-coo pod/alertmanager-example-coo-monitoring-stack-0 9093

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2. 通过浏览 http://localhost:9090/targets 或 http://localhost:9093/#/alerts 来验证目标是否已被 scrape。