kubernetes - kubernetes 上的 prometheus 节点导出器

Question

我已经在 kubernetes 集群(EKS)上部署了 prometheus。我能够成功刮取 prometheus和 traefik与以下

scrape_configs:
  # A scrape configuration containing exactly one endpoint to scrape:

  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'
    # Override the global default and scrape targets from this job every 5 seconds.
    scrape_interval: 5s
    static_configs:
      - targets: ['prometheus.kube-monitoring.svc.cluster.local:9090']

  - job_name: 'traefik'
    static_configs:
      - targets: ['traefik.kube-system.svc.cluster.local:8080']

但是节点导出器部署为 DaemonSet以下定义不公开节点指标。

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: node-exporter
  namespace: kube-monitoring
spec:
  selector:
    matchLabels:
      app: node-exporter
  template:
    metadata:
      name: node-exporter
      labels:
        app: node-exporter
    spec:
      hostNetwork: true
      hostPID: true
      containers:
      - name: node-exporter
        image: prom/node-exporter:v0.18.1
        args:
        - "--path.procfs=/host/proc"
        - "--path.sysfs=/host/sys"
        ports:
        - containerPort: 9100
          hostPort: 9100
          name: scrape
        resources:
          requests:
            memory: 30Mi
            cpu: 100m
          limits:
            memory: 50Mi
            cpu: 200m
        volumeMounts:
        - name: proc
          readOnly:  true
          mountPath: /host/proc
        - name: sys
          readOnly: true
          mountPath: /host/sys
      tolerations:
        - effect: NoSchedule
          operator: Exists
      volumes:
      - name: proc
        hostPath:
          path: /proc
      - name: sys
        hostPath:
          path: /sys

并遵循普罗米修斯中的 scrape_configs

scrape_configs:
  - job_name: 'kubernetes-nodes'
    scheme: http
    kubernetes_sd_configs:
    - role: node
    relabel_configs:
    - action: labelmap
      regex: __meta_kubernetes_node_label_(.+)
    - target_label: __address__
      replacement: kubernetes.kube-monitoring.svc.cluster.local:9100
    - source_labels: [__meta_kubernetes_node_name]
      regex: (.+)
      target_label: __metrics_path__
      replacement: /api/v1/nodes/${1}/proxy/metrics 

我也试过 curl http://localhost:9100/metrics从容器之一，但得到 curl: (7) Failed to connect to localhost port 9100: Connection refused
我在这里缺少什么配置？

在建议通过 helm 安装 Prometheus 后，我没有将其安装在测试集群上，并尝试将我的原始配置与 helm 安装的 Prometheus 进行比较。

以下 Pod 正在运行:

NAME                                                     READY   STATUS    RESTARTS   AGE
alertmanager-prometheus-prometheus-oper-alertmanager-0   2/2     Running   0          4m33s
prometheus-grafana-66c7bcbf4b-mh42x                      2/2     Running   0          4m38s
prometheus-kube-state-metrics-7fbb4697c-kcskq            1/1     Running   0          4m38s
prometheus-prometheus-node-exporter-6bf9f                1/1     Running   0          4m38s
prometheus-prometheus-node-exporter-gbrzr                1/1     Running   0          4m38s
prometheus-prometheus-node-exporter-j6l9h                1/1     Running   0          4m38s
prometheus-prometheus-oper-operator-648f9ddc47-rxszj     1/1     Running   0          4m38s
prometheus-prometheus-prometheus-oper-prometheus-0       3/3     Running   0          4m23s

我在 pod 中没有找到节点导出器的任何配置 prometheus-prometheus-prometheus-oper-prometheus-0在 /etc/prometheus/prometheus.yml

Answer 1

之前使用 Helm 的建议非常有效，我也建议这样做。

关于您的问题:问题是您没有直接抓取节点，而是为此使用了 node-exporter。所以role: node不正确，您应该使用 role: endpoints .为此，您还需要为 DaemonSet 的所有 pod 创建服务。

这是我的环境中的工作示例(由 Helm 安装):

- job_name: monitoring/kube-prometheus-exporter-node/0
  scrape_interval: 15s
  scrape_timeout: 10s
  metrics_path: /metrics
  scheme: http
  kubernetes_sd_configs:
  - role: endpoints
    namespaces:
      names:
      - monitoring
  relabel_configs:
  - source_labels: [__meta_kubernetes_service_label_app]
    separator: ;
    regex: exporter-node
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_endpoint_port_name]
    separator: ;
    regex: metrics
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_namespace]
    separator: ;
    regex: (.*)
    target_label: namespace
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_pod_name]
    separator: ;
    regex: (.*)
    target_label: pod
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: service
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: job
    replacement: ${1}
    action: replace
  - separator: ;
    regex: (.*)
    target_label: endpoint
    replacement: metrics
    action: replace