version: "3"
volumes:
  esdata:
services:
  fluentd: 
    build: ./fluentd
    links: # Sends incoming logs to the elasticsearch container.
      - elasticsearch
    depends_on:
      - elasticsearch
    ports: # Exposes the port 24224 on both TCP and UDP protocol for log aggregation
      - 24224:24224
      - 24224:24224/udp
  elasticsearch:
    image: elasticsearch:7.17.0
    expose: # Exposes the default port 9200
      - 9200
    environment:
      - discovery.type=single-node # Runs as a single-node
    volumes: # Stores elasticsearch data locally on the esdata Docker volume
      - esdata:/usr/share/elasticsearch/data
  kibana:
    image: kibana:7.17.0
    links: # Links kibana service to the elasticsearch container
      - elasticsearch
    depends_on:
      - elasticsearch
    ports: # Runs kibana service on default port 5601
      - 5601:5601
    environment: # Defined host configuration
      - ELASTICSEARCH_HOSTS=http://elasticsearch:9200