如何使用prometheus operator service monitor监控kubernetes pod中没有运行的外部服务

Question

我已成功配置我的服务监视器以监视提供在 kubernetes pod 中运行的指标的 API。但是，我也想将外部服务添加到我的服务监视器目标中。此外部服务是 arangoDB oasis 导出器指标 (https://www.youtube.com/watch?v=c8i7K4HUPF4&t=554s)。并且此服务未在 kubernetes 容器中运行。以下是我关心的配置文件：

1. /helm/charts/prometheus-xxx/templates/service_monitor.tpl

---
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: {{ template "jobs-manager-servicemonitor.fullname" . }}
  # Change this to the namespace the jobs-manager-servicemonitor instance is running in
  namespace: {{ .Values.serviceMonitor.namespace }}
  labels:
    serviceapp: {{ template "jobs-manager-servicemonitor.name" . }}
    release: "{{ .Release.Name }}"
spec:
  selector:
    matchLabels:
      # Targets jobs-manager service
      app.kubernetes.io/instance: {{ .Values.instance.name }}
  endpoints:
    - port: {{ .Values.service.metricsPort.name }}
      interval: {{ .Values.serviceMonitor.interval }}
      {{- if .Values.serviceMonitor.scrapeTimeout }}
      scrapeTimeout: {{ .Values.serviceMonitor.scrapeTimeout }}
      {{- end }}
  namespaceSelector:
    matchNames:
    - {{ .Values.Namespace }}

1. /helm/charts/prometheus-xxx/Chart.yaml

apiVersion: v1
appVersion: "1.0.0"
description: Prometheus Service monitor, customized
name: jobs-manager-servicemonitor
version: 1.0.1

1. /helm/charts/prometheus-xxx/templates/_helpers.tpl

{{/*
Expand the name of the chart.
*/}}
{{- define "jobs-manager-servicemonitor.name" -}}
{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
{{- end }}

{{/*
Create a default fully qualified app name.
We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
If release name contains chart name it will be used as a full name.
*/}}
{{- define "jobs-manager-servicemonitor.fullname" -}}
{{- if .Values.fullnameOverride -}}
{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
{{- else -}}
{{- $name := default .Chart.Name .Values.nameOverride -}}
{{- if contains $name .Release.Name -}}
{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
{{- else -}}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
{{- end -}}
{{- end -}}
{{- end -}}

4. /helm/charts/prometheus-xxx/values.yaml

serviceMonitor:
  enabled: false
  namespace: prometheus
  interval: 10s
  scrapeTimeout: 10s

service:
  metricsPort:
    name: http

instance:
  name: jobs-manager
  
Namespace: test1

您对如何将不在 kubernetes pod 中运行的外部服务添加到服务监视器的目标有什么建议吗？非常感谢您。

---------更新后---------

这是我在图表模板arangodb-servicemonitor中的新配置文件：

1. /helm/charts/arangodb-servicemonitor/templates/service.yaml

apiVersion: v1
kind: Service
metadata:
  name: arangodb
  namespace: prometheus
  labels:
    app: arangodb
    release: prometheus
spec:
  type: ClusterIP
  externalName: xxxxx.arangodb.cloud:xxxx
  ports:
    - name: metrics
      port: 9000
      targetPort: 9000
      protocol: TCP
    - bearer_token: [ARANGODB_TOKEN]
    type: ExternalName

1. /helm/charts/arangodb-servicemonitor/templates/endpoints.yaml

kind: Endpoints
apiVersion: v1
metadata:
  name: arangodb
  labels:
    app: arangodb
subsets:
- addresses:
  - ip: xxxxx.arangodb.cloud:xxxx
  ports: 
  - name: metrics
    port: 9000
    protocol: TCP

1. /helm/charts/arangodb-servicemonitor/templates/service_monitor.tpl

---
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: arangodb-servicemonitor
  # Change this to the namespace the arangodb-servicemonitor instance is running in
  namespace: prometheus
  labels:
    serviceapp: arangodb-servicemonitor
    release: prometheus
spec:
  selector:
    # Targets arangodb service
    app: arangodb
  endpoints:
    # TO DO: use an array (List) of endpoints to monitor many endpoints
    - port: metrics
      interval: 30s
  namespaceSelector:
    matchNames:
    # TO DO: use an array (List) of endpoints to monitor many endpoints
    - default

但是当我执行terraform apply 时，我收到关于我添加的bearer_token 的错误消息：

有关信息，我需要添加此令牌以连接到 ArangoDB 外部服务：

Answer 1

创建 Kubernetes 服务并以同样的方式使用 Prometheus ServiceMonitor。

创建 K8s 服务

kind: Service
apiVersion: v1
metadata:
 name: arangoDB
spec:
 type: ClusterIP
 ports:
 - name: metrics
   port: 9000
   targetPort: 9000

在此 prometheus 中创建该 Db 的 Endpoint 配置应该能够访问您的数据库的 IP

kind: Endpoints
apiVersion: v1
metadata:
 name: arangoDB
subsets:
 - addresses:
     - ip: IP of Database
   ports: 
     - name: metrics
       port: 9000 

如此好的服务监视器将检查 Kubernetes 服务，并且 Kubernetes 服务将指向端点和数据库并从外部服务获取指标。

检查端点服务创建详细信息。 ：https://kubernetes.io/docs/concepts/services-networking/service/#services-without-selectors