fluent-bit / loki / grafana on Docker Swarm

docker-compose.yaml

version: '3.8'

configs:
  loki-conf:
    file: ./loki.conf
  fluent-bit-conf:
    file: ./fluent-bit.conf

networks:
  monitoring:
    external: true
    name: mon_monitoring

volumes:
  loki-data:

services:
  loki:
    image: grafana/loki:2.0.0
    networks:
    - monitoring
    volumes:
    - loki-data:/loki
    configs:
    - source: loki-conf
      target: /etc/loki/local-config.yaml

  fluent-bit:
    image: fluent/fluent-bit:1.6.6
    configs:
    - source: fluent-bit-conf
      target: /fluent-bit/etc/fluent-bit.conf
    deploy:
      mode: global
    environment:
      - LOKI_URL=http://loki:3100/loki/api/v1/push
    networks:
      - monitoring
    volumes:
      - /var/lib/docker/containers:/var/lib/docker/containers

  grafana:
   image: grafana/grafana:7.3.3
   deploy:
     replicas: 1
   networks:
   - monitoring
   ports:
   - 3030:3000

fluent-bit.conf

[SERVICE]
   Flush         10
   Log_Level     error
   Daemon        off
   Parsers_File  parsers.conf

[INPUT]
   Name    tail
   Path    /var/lib/docker/containers/*/*.log
   Parser  docker
   Refresh_Interval 10
   Mem_Buf_Limit    10MB
   Skip_Long_Lines  On

[FILTER]
   name   grep
   match  *
   regex  log service

[FILTER]
   Name     parser
   Match    *
   Key_Name log
   Parser   json

[OUTPUT]
   name  loki
   match *
   host loki
   labels job=fluentbit, $service

loki.conf

auth_enabled: false

server:
  http_listen_port: 3100
  log_level: warn

ingester:
  lifecycler:
    address: 127.0.0.1
    ring:
      kvstore:
        store: inmemory
      replication_factor: 1
    final_sleep: 0s
  chunk_idle_period: 5m
  chunk_retain_period: 30s

schema_config:
  configs:
  - from: 2020-05-15
    store: boltdb
    object_store: filesystem
    schema: v11
    index:
      prefix: index_
      period: 168h

storage_config:
  boltdb:
    directory: /loki/index

  filesystem:
    directory: /loki/chunks

limits_config:
  enforce_metric_name: false
  reject_old_samples: true
  reject_old_samples_max_age: 168h