catapulte/compose/load-test.yml at main · jdrouet/catapulte · GitHub

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# Multi-replica load test.
#
# N catapulte replicas share Postgres (storage) and NATS (queue) and deliver to
# Mailpit; k6 drives POST /emails over the compose network, where Docker's
# round-robin DNS spreads connections across the replicas (so catapulte
# publishes no host port — that's what lets the service scale cleanly).
#
# Replica count is set by `deploy.replicas` on the catapulte service below — NOT
# a CLI `--scale`, because `docker compose run` resets a CLI scale back to the
# file default and would silently drop you to 1 replica mid-test.
#
#   docker compose -f compose/load-test.yml up -d --build        # 3 replicas
#   docker compose -f compose/load-test.yml --profile loadgen run --rm \
#     -e K6_MODE=fixed -e MAILPIT_URL=http://mailpit:8025 k6      # submit + verify delivery
#   docker compose -f compose/load-test.yml down -v
#
# To change the replica count, edit deploy.replicas (re-run `up -d` to apply).
services:
  catapulte:
    build:
      context: ..
    environment:
      - "CATAPULTE_HTTP_ADDRESS=0.0.0.0:3000"
      - "CATAPULTE_STORAGE_BACKEND=postgres"
      - "CATAPULTE_POSTGRES_URL=postgres://catapulte:catapulte@postgres:5432/catapulte"
      - "CATAPULTE_QUEUE_BACKEND=nats"
      - "CATAPULTE_QUEUE_URL=nats://nats:4222"
      - "CATAPULTE_SENDERS=mailpit"
      - "CATAPULTE_SENDER_MAILPIT_HOST=mailpit"
      - "CATAPULTE_SENDER_MAILPIT_PORT=1025"
      - "CATAPULTE_SENDER_MAILPIT_TLS=none"
      - "CATAPULTE_ATTACHMENT_FS_ROOT=/data/attachments"
    healthcheck:
      test: ["CMD", "catapulte", "healthcheck"]
      interval: 5s
      timeout: 5s
      retries: 10
      start_period: 10s
    depends_on:
      postgres:
        condition: service_healthy
      nats:
        condition: service_started
      mailpit:
        condition: service_started
    # Intrinsic replica count (survives `docker compose run`). No published
    # port: replicas share the `catapulte` service name and k6 reaches them via
    # the compose network's round-robin DNS.
    deploy:
      replicas: 3

  postgres:
    image: postgres:16-alpine
    environment:
      - "POSTGRES_USER=catapulte"
      - "POSTGRES_PASSWORD=catapulte"
      - "POSTGRES_DB=catapulte"
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U catapulte"]
      interval: 3s
      timeout: 5s
      retries: 10

  nats:
    image: nats:2.10-alpine
    command: ["-js"]

  mailpit:
    image: axllent/mailpit
    environment:
      # Keep every message (default caps at 500) so delivered count is exact.
      - "MP_MAX_MESSAGES=0"
    ports:
      - "8025:8025" # web UI + API (host-side delivery count)

  k6:
    image: grafana/k6:latest
    profiles: ["loadgen"]
    volumes:
      - ./k6:/scripts:ro
    command: ["run", "/scripts/load.js"]
    depends_on:
      catapulte:
        condition: service_healthy