概要

Flaskを活用して自作exporterを作成し、Prometheusでmetrics取得->Grafanaでmetrics可視化を行う手順の備忘録

手順

構成

.
├── docker-compose.yml
├── flask
│   ├── Dockerfile
│   └── app
│       └── app.py
├── grafana
│   ├── Dockerfile
│   └── datasource.yml
└── prometheus.yml

flask/Dockerfile

FROM ubuntu:latest
RUN apt-get update
RUN apt-get install python3 python3-pip -y
RUN pip3 install flask prometheus-client
RUN mkdir /app

flask/app.py

from flask import Flaskimport json
import queue
from werkzeug.middleware.dispatcher import DispatcherMiddleware
from prometheus_client import make_wsgi_app,Gauge

app = Flask(__name__)
G1 = Gauge('Gauge1','Gauge test')
G2 = Gauge('Gauge2','Gauge test')

@app.route('/upG1',methods=["GET"])
def upG1():
    G1.inc()
    return "upG1"

@app.route('/upG2',methods=["GET"])
def upG2():
    G2.inc()
    return "upG2"

@app.route('/downG1',methods=["GET"])
def downG1():
    G1.dec()
    return "downG1"

@app.route('/downG2',methods=["GET"])
def downG2():
    G2.dec()
    return "downG2"

app.wsgi_app = DispatcherMiddleware(app.wsgi_app, {
    '/metrics': make_wsgi_app()
})

if __name__ == '__main__':
    G1.set(0)
    G2.set(0)
    app.run(host='0.0.0.0',port=5000)

grafana/Dockerfile

FROM grafana/grafana:master
COPY ./datasource.yml /etc/grafana/provisioning/datasources/

grafana/datasource.yml

datasources:
  - name: prometheus
    type: prometheus
    access: proxy
    url: "http://prometheus:9090"

prometheus.yml

  • 15秒間隔でexporterからmetricsを取得するように設定しています。
global:
  scrape_interval: 15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    static_configs:
      - targets: ['flask:5000']

docker-compose.yml

version: "3"
services:
  flask:
    build: ./flask
    command: python3 app/app.py
    volumes:
       - ./flask/app:/app
    ports:
       - 5000:5000
  prometheus:
    image: prom/prometheus
    volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yml
    ports:
      - 9090:9090
  grafana:
      build: ./grafana
      ports:
        - 3000:3000
      environment:
        - GF_SECURITY_ADMIN_PASSWORD=password
        - GF_USERS_ALLOW_SIGN_UP=false

起動確認

  • 「docker-compose build」→「docker-compose up -d」を行って３つのコンテナが立ち上がっているのを確認
  • http://localhost:3000でGrafanaへ接続
    • ID：admin、PASSWORD：passwordでsign in
    • 「Configuration」→「Data Sources」に「Prometheus」があればおk