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ʹÓÃPrometheus¾ÙÐÐÓ¦Óüà¿Ø

PrometheusÊÇÒ»¿î¿ªÔ´£¬»ùÓÚPullÄ£×ÓµÄЧÀͼà²âºÍÖÒÑÔ¹¤¾ß£¬ÓÉSoundCloud¿ª·¢ ¡£ËüʹÓÃGoÓïÑÔ±àд£¬±»ÆÕ±éÓ¦ÓÃÓÚ΢ЧÀͼƻ®ºÍÔÆÇéÐÎÖÐ ¡£×÷Ϊһ¿î¼à¿Ø¹¤¾ß£¬Ëü¿ÉÒÔ¶ÔDockerµÄCPU¡¢ÄÚ´æ¡¢ÍøÂçºÍ´ÅÅ̵ȾÙÐмà¿Ø£¬²¢ÇÒ»¹Ö§³Ö¶àάÊý¾ÝÇл»¡¢ÎÞаµÄÅÌÎÊ¡¢±¨¾¯ÒÔ¼°¿ÉÊÓ»¯µÈ¹¦Ð§£¬ÈÃÄã¿ÉÒÔ¿ìËÙ×ö³ö·´Ó¦£¬²¢¿ìËÙ×ö³ö¾öÒé ¡£

ÉÐÓÐÒ»µãÐèҪעÖصÄÊÇ£¬PrometheusÐèҪͨ¹ýPull·½·¨µÄ²ÉÑù£¬Ò²¾ÍÊÇ»á¼û±»¼à¿ØÓ¦ÓÃÖеÄ/metrics½Ó¿Ú»ñÈ¡¼à¿ØÊý¾Ý ¡£ÒÔÊÇ£¬ÔÚÆô¶¯±»¼à¿ØÓ¦ÓþµÏñʱ£¬ÐèÒªÏȽ«¿ÉÒÔ»á¼ûµ½PrometheusµÄIPºÍ¶Ë¿ÚÉèÖõ½/metrics½Ó¿ÚÖÐ ¡£ÏÂÃæÊÇÒ»¸ö¼òÆÓµÄNode.jsÓ¦Óà ¡£

const express = require('express')
const app = express()

app.get('/', (req, res) => {
  res.send('Hello World!')
})

app.get('/metrics', (req, res) => {
  res.send(`
    # HELP api_calls_total Total API calls
    # TYPE api_calls_total counter
    api_calls_total 100
  `)
})

app.listen(3000, () => {
  console.log('Example app listening on port 3000!')
})

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½Ó×Å£¬ÔÚ¹ÙÍøÉÏÏÂÔØPrometheusµÄDocker¾µÏñ£¬²¢½¨ÉèÒ»¸ödocker-compose.ymlÎļþ£¬²¢ÇÒÔÚ¸ÃÎļþÖУ¬ÎÒÃÇ»ñÈ¡¸ÃNode.jsÓ¦ÓõÄÊý¾Ý ¡£

version: '3'
services:
  node:
    image: node:lts
    command: node index.js
    ports:
      - 3000:3000

  prometheus:
    image: prom/prometheus:v2.25.2
    volumes:
      - ./prometheus:/etc/prometheus
    command:
      - '--config.file=/etc/prometheus/prometheus.yml'
      - '--storage.tsdb.retention.time=15d'
    ports:
      - 9090:9090

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×îºó£¬ÔÚprometheus.ymlÎļþÖУ¬ÎÒÃÇÐèÒª½ç˵Ҫ»ñÈ¡µÄÊý¾ÝȪԴ ¡£

global:
  scrape_interval:     15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: 'node-exporter'
    static_configs:
    - targets: ['node:9100']

  - job_name: 'node-js-app'
    static_configs:
    - targets: ['node:3000']

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×îºó£¬ÔËÐÐdocker-compose upÏÂÁ¼´¿ÉÆô¶¯Õû¸öÓ¦Óü°Æä¼à¿ØЧÀÍ£¬²¢ÔÚPrometheusÖÐÉó²é¸Ã»áÔ±Ö¸±ê ¡£

ʹÓÃElasticSearchºÍLogstash¾ÙÐÐÈÕÖ¾ÖÎÀí

ÔÚDockerÖУ¬Ó¦ÓõÄÈÕÖ¾Êý¾ÝÂþÑÜÔÚ²î±ðµÄDockerÈÝÆ÷ÖÐ ¡£ÈôÊÇÄãÒªÔÚ¼¯Öеĵط½¶ÔÕâЩÈÕÖ¾¾ÙÐÐÖÎÀí£¬ÄÇô¿ÉÒÔͨ¹ýʹÓÃELKÖеÄElasticSearchºÍLogstash,½«ÈÕÖ¾ÖÐÐÄ»¯ÖÎÀí£¬ÒÔ±ã¸üÇáËɵØʵÏÖÅÌËã»ú×ÊÔ´µÄ¼à¿ØºÍÆÊÎö ¡£

ÔÚ×îÏÈ֮ǰ£¬ÐèÒªÏÈÏÂÔØLogstashºÍElasticSearchµÄDocker¾µÏñ£¬²¢½¨ÉèÒ»¸ödocker-compose.ymlÎļþ ¡£

ÔÚ¸ÃÎļþÖУ¬ÎÒÃǽç˵ÁËÈý¸öЧÀÍ£¬ÆäÖÐblsÊÇÓÃÀ´Ä£ÄâÓªÒµÈÕÖ¾µÄAPIЧÀÍ£¬Æäÿ´ÎÏìÓ¦ºó£¬½«¼Í¼һÌõÈÕÖ¾µ½stdoutºÍÈÕÖ¾ÎļþÖÐ ¡£logstashЧÀÍÊÇÓÉLogstash¹Ù·½ÌṩµÄDocker¾µÏñ¹¹½¨£¬ÓÃÓÚÍøÂç¡¢¹ýÂ˺ʹ«ÊäÈÕÖ¾ ¡£ElasticSearchЧÀÍÓÃÓÚ´æ´¢ºÍ¼ìË÷ÈÕÖ¾ ¡£

version: '3'
services:
  bls:
    image: nginx:alpine
    volumes:
      - ./log:/var/log/nginx
      - ./public:/usr/share/nginx/html:ro
    ports:
      - "8000:80"
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "10"

  logstash:
    image: logstash:7.10.1
    volumes:
      - ./logstash/pipeline:/usr/share/logstash/pipeline
    environment:
      - "ES_HOST=elasticsearch"
    depends_on:
      - elasticsearch

  elasticsearch:
    image: elasticsearch:7.10.1
    environment:
      - "http.host=0.0.0.0"
      - "discovery.type=single-node"
    volumes:
      - ./elasticsearch:/usr/share/elasticsearch/data

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ÔÚÉèÖÃÎļþµÄlogstashÖУ¬ÎÒÃǽç˵ÁËÒ»¸öеÄpipeline£¬ÆäÃûΪnginx_pipeline.conf£¬¸ÃÎļþÓÃÓÚ´¦ÀínginxÈÕÖ¾µÄÍøÂç¡¢¹ýÂ˺ʹ«Êä ¡£ÓëELKµÄÊÂÇéÔ­ÀíÏàͬ£¬logstash½«Æ¾Ö¤²î±ðµÄÌõ¼þ£¬¶ÔÎüÊÕµ½µÄÈÕÖ¾¾ÙÐд¦Àí£¬²¢½«Æä·¢Ë͵½ÒѾ­½¨ÉèµÄ Elasticsearch ¼¯ÈºÖÐ ¡£ÔÚ¸ÃÉèÖÃÎļþÖУ¬ÎÒÃǽç˵ÁËÈçÏ´¦ÀíÂß¼­£º

input {
  file {
    path => "/var/log/nginx/access.log"
  }
}

filter {
  grok {
    match => { "message" => "%{COMBINEDAPACHELOG}" }
  }
}

output {
  elasticsearch {
    hosts => [ "${ES_HOST}:9200" ]
    index => "nginx_log_index"
  }
}

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