latrobe-cloud-assessment-3/docker-compose.yml at main · nickgreengithub/latrobe-cloud-assessment-3 · GitHub

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# The application and its observability stack.
#
# rss-server holds the Next.js server, its API and the SQLite database in one
# container: SQLite keeps the application to a single process with no start-up
# ordering to get wrong, and the database file lives on a named volume so
# content survives `docker compose down`.
#
# The other three services are the Assessment 3 addition. The application never
# talks to Jaeger or Prometheus directly — it emits OTLP to the collector, and
# the collector decides where telemetry goes. Swapping Jaeger for something
# else is then a change to otel-collector-config.yaml rather than to the app.
#
#   rss-server ──OTLP/HTTP──▶ otel-collector ──▶ jaeger      (traces)
#        ▲
#        └────────────scrape /api/metrics──── prometheus      (metrics)
#
# All images are pinned. An unpinned :latest silently changed the collector's
# config format underneath this stack once already.

services:
  rss-server:
    build: .
    image: latrobe-rss-server:3.0.0
    container_name: rss-server
    ports:
      - "3000:3000"
    environment:
      DATABASE_URL: "file:/data/rss.db"
      NODE_ENV: production
      # Absolute URLs inside the RSS feed. Change this when serving from a
      # different host so <link> and <guid> stay resolvable for clients.
      SITE_URL: "http://localhost:3000"
      # Service name as it appears in Jaeger's service dropdown.
      OTEL_SERVICE_NAME: "rss-server"
      # The collector, by compose service name — not localhost, which inside
      # this container would mean the container itself.
      OTEL_EXPORTER_OTLP_ENDPOINT: "http://otel-collector:4318"
    volumes:
      - rss-data:/data
    depends_on:
      - otel-collector
    restart: unless-stopped

  # Receives OTLP from the application and forwards it. The contrib image
  # rather than core: core omits several exporters, including the one used
  # here, and fails at start-up with an unhelpful "unknown type" error.
  otel-collector:
    image: otel/opentelemetry-collector-contrib:0.145.0
    container_name: otel-collector
    command: ["--config=/etc/otel-collector-config.yaml"]
    volumes:
      - ./otel-collector-config.yaml:/etc/otel-collector-config.yaml:ro
    ports:
      - "4318:4318" # OTLP/HTTP — what the app exports to
      - "4317:4317" # OTLP/gRPC
      - "8889:8889" # collector's own metrics, scraped by Prometheus
      - "13133:13133" # health check extension
    depends_on:
      - jaeger
    restart: unless-stopped

  # Trace storage and UI. In-memory storage is deliberate: traces are for the
  # live demonstration, and persisting them would mean another volume and
  # another thing to run out of disk on the EC2 box.
  jaeger:
    image: jaegertracing/jaeger:2.14.0
    container_name: jaeger
    ports:
      - "16686:16686" # Jaeger UI
    restart: unless-stopped

  prometheus:
    image: prom/prometheus:v3.9.1
    container_name: prometheus
    command:
      - "--config.file=/etc/prometheus/prometheus.yml"
      - "--storage.tsdb.retention.time=6h"
    volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
    ports:
      - "9090:9090"
    depends_on:
      - rss-server
    restart: unless-stopped

volumes:
  rss-data: