prometheus服务发现

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使用 static_configs 的方式静态的定义监控目标不太方便。

引入一个中间的代理人（服务注册中心），这个代理人掌握着当前所有监控目标的访问信息，Prometheus只需要向这个代理人询问有哪些监控目标即可，而不需要重启， 这种模式被称为服务发现。

基于文件的服务发现

/etc/prometheus/prometheus.yml

设置每两分钟基于文件更新

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# my global config
global:
  scrape_timeout: 10s
  scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

# Alertmanager configuration
alerting:
  alertmanagers:
    - static_configs:
        - targets:
          # - alertmanager:9093

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.

  - job_name: 'prometheus'
    file_sd_configs:
    - files:
      - targets/prometheus-*.yaml
      refresh_interval: 2m

  - job_name: 'nodes'
    file_sd_configs:
    - files:
      - targets/nodes-*.yaml
      refresh_interval: 2m

新建文件，发现可以自动更新

/etc/prometheus/targets/nodes-linux.yaml

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- targets:
  - 10.0.10.192:9100
  - 10.0.10.141:9100
  labels:
    app: node-exporter
    job: node
    env: other

- targets:
  - localhost:9100
  labels:
    app: node-exporter
    job: node
    env: main

/etc/prometheus/targets/nodes-linux.yaml

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- targets:
  - localhost:9090
  labels:
    app: prometheus
    job:  prometheus

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