graylog.yaml

# Based on: https://docs.graylog.org/en/3.3/pages/installation/docker.html
version: "3.8"

volumes:
  mongo_data:
    driver: local
  es_data:
    driver: local
  graylog_data:
    driver: local

secrets:
  graylog_password_secret:
    external: true
  graylog_root_password_sha2:
    external: true

networks:
  graylog:
    driver: overlay

services:
  # MongoDB: https://hub.docker.com/_/mongo/
  mongo:
    image: mongo:3
    volumes:
      - mongo_data:/data/db
    networks:
      - graylog
    deploy:
      resources:
        limits:
          memory: 512M

  # Elasticsearch: https://hub.docker.com/_/elasticsearch
  elasticsearch:
    image: elasticsearch:6.8.12
    environment:
      - discovery.type=single-node
      - ES_JAVA_OPTS=-Xms256M -Xmx256M
    volumes:
      - es_data:/usr/share/elasticsearch/data
    networks:
      - graylog
    deploy:
      resources:
        limits:
          memory: 768M
    # Option 'ulimits' does not work with docker swarm
    # https://stackoverflow.com/a/55556893/12869323
    # ulimits:
    #   memlock:
    #     soft: -1
    #     hard: -1

  # Graylog: https://hub.docker.com/r/graylog/graylog/
  graylog:
    image: graylog/graylog:3.3
    ports:
      # Graylog web interface and REST API
      - 9000:9000
      # Syslog TCP
      - 1514:1514
      # Syslog UDP
      - 1514:1514/udp
      # GELF TCP
      - 12201:12201
      # GELF UDP
      - 12201:12201/udp
    environment:
      - GRAYLOG_PASSWORD_SECRET__FILE=/run/secrets/graylog_password_secret
      - GRAYLOG_ROOT_PASSWORD_SHA2__FILE=/run/secrets/graylog_root_password_sha2
    volumes:
      - graylog_data:/usr/share/graylog/data
    secrets:
      - graylog_password_secret
      - graylog_root_password_sha2
    networks:
      - graylog
    deploy:
      resources:
        limits:
          memory: 768M
    # Override the Graylog's image HEALTHCHECK to be less strict
    # https://community.graylog.org/t/graylog-docker-unhealthy-container/12945/7
    healthcheck:
      timeout: 30s
      start_period: 120s