version: '3'
services:
  # Database, Scraper
  prometheus:
    image: prom/prometheus
    ports:
      - 9090:9090
    volumes:
      - prometheus-data:/prometheus  # This volume stores the actual Prometheus data
      - ./docker/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml
    command:
      - --config.file=/etc/prometheus/prometheus.yml
      - --enable-feature=exemplar-storage

  # Web UI
  grafana:
    image: grafana/grafana
    restart: unless-stopped
    ports:
      - 3001:3000
    environment:
      - GF_SECURITY_ADMIN_USER=${GF_SECURITY_ADMIN_USER}
      - GF_SECURITY_ADMIN_PASSWORD=${GF_SECURITY_ADMIN_PASSWORD}
      - GF_USERS_ALLOW_SIGN_UP=false
    volumes:
      - grafana-data:/var/lib/grafana   # This volume stores Grafana's data
      - ./docker/grafana/datasources/:/etc/grafana/provisioning/datasources/

  # Scrapped by Prometheus for docker container
  cadvisor:
    image: gcr.io/cadvisor/cadvisor
    ports:
      - 8080:8080
    volumes:
    - /:/rootfs:ro
    - /var/run:/var/run:rw
    - /sys:/sys:ro
    - /var/lib/docker/:/var/lib/docker:ro

  # Scrapped by Prometheus for host machine
  node-exporter:
    image: prom/node-exporter
    restart: unless-stopped
    ports:
      - 9100:9100
    volumes:
      - /proc:/host/proc:ro
      - /sys:/host/sys:ro
      - /:/rootfs:ro
    command:
      - '--path.procfs=/host/proc'
      - '--path.rootfs=/rootfs'
      - '--path.sysfs=/host/sys'
      - '--collector.filesystem.mount-points-exclude=^/(sys|proc|dev|host|etc)($$|/)'

  # Scrapped by Prometheus for nginx routing
  nginx-exporter:
    image: nginx/nginx-prometheus-exporter
    restart: unless-stopped
    command: "-nginx.scrape-uri=http://nginx:8080/stub_status"
    ports:
      - 9114:9113

volumes:
  prometheus-data:
    external: false
  grafana-data:
    external: false