Prometheus简单示例

Prometheus简单示例

Prometheus

Prometheus 是一款基于时序数据库的开源监控告警系统。Prometheus的基本原理是通过HTTP协议周期性抓取被监控组件的状态，任意组件只要提供对应的HTTP接口就可以接入监控。不需要任何SDK或者其他的集成过程。

示例

下载安装启动

wget https://github.com/prometheus/prometheus/releases/download/v2.37.6/prometheus-2.37.6.linux-amd64.tar.gz
tar xvfz prometheus-2.37.6.linux-amd64.tar.gz 
cd prometheus-2.37.6.linux-amd64/
./prometheus --config.file=prometheus.yml

此时打开http://localhost:9090/即可以看到监控界面

Go客户端编写

package main

import (
    "net/http"

    "github.com/prometheus/client_golang/prometheus/promhttp"
)

func main() {
    //提供 /metrics HTTP 端点
    http.Handle("/metrics", promhttp.Handler())
    //端口号
    http.ListenAndServe(":2112", nil)
}

运行后访问http://localhost:2112/metrics可以看到采集的指标数据

注册自定义应用程序指定指标：

package main

import (
    "net/http"
    "time"

    "github.com/prometheus/client_golang/prometheus"
    "github.com/prometheus/client_golang/prometheus/promauto"
    "github.com/prometheus/client_golang/prometheus/promhttp"
)

func recordMetrics() {
    //每2秒，计数器增加1。
    go func() {
        for {
            opsProcessed.Inc()
            time.Sleep(2 * time.Second)
        }
    }()
}

// 公开了 myapp_processed_ops_total 计数器
var (
    opsProcessed = promauto.NewCounter(prometheus.CounterOpts{
        Name: "myapp_processed_ops_total",
        Help: "The total number of processed events",
    })
)

func main() {
    recordMetrics()

    http.Handle("/metrics", promhttp.Handler())
    http.ListenAndServe(":2112", nil)
}

运行后访问http://localhost:2112/metrics可以看到自定义的指标，每2秒，计数器增加1

服务端看板

可以修改配置文件：prometheus.yml

# my global config
global:
  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"

    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.

    static_configs:
      - targets: ["localhost:2112"]

将最后的targets修改成客户端启动的端口即可