---
# Loki + Alloy + Grafana log aggregation stack
# Place this file in a directory e.g. ~/docker/loki-stack/
# Run with: docker compose up -d

networks:
  logging:
    driver: bridge

services:

  # ── Loki: log storage and query engine ──────────────────────────────────────
  loki:
    image: grafana/loki:3.4.2
    container_name: loki
    restart: unless-stopped
    networks:
      - logging
    ports:
      - "3100:3100"       # Loki HTTP API (Alloy pushes here; Grafana queries here)
    volumes:
      - /var/lib/loki:/loki
      - /etc/loki:/etc/loki:ro
    command: -config.file=/etc/loki/loki.yml
    healthcheck:
      test: ["CMD-SHELL", "wget -q --spider http://localhost:3100/ready || exit 1"]
      interval: 30s
      timeout: 5s
      retries: 5

  # ── Alloy: log collector / syslog receiver ───────────────────────────────────
  alloy:
    image: grafana/alloy:v1.7.5
    container_name: alloy
    restart: unless-stopped
    networks:
      - logging
    ports:
      - "5140:5140/udp"     # Syslog UDP (for MikroTik and other network devices)
      - "5140:5140/tcp"     # Syslog TCP
      - "12345:12345"     # Alloy UI (optional, useful for debugging)
    volumes:
      - /etc/alloy/alloy.alloy:/etc/alloy/config.alloy:ro
      - /var/lib/docker/containers:/var/lib/docker/containers:ro  # Docker log access
      - /var/run/docker.sock:/var/run/docker.sock:ro              # Docker metadata
    command: run /etc/alloy/config.alloy --server.http.listen-addr=0.0.0.0:12345
    depends_on:
      loki:
        condition: service_healthy

  # ── Grafana: log query UI ────────────────────────────────────────────────────
  grafana:
    image: grafana/grafana:11.5.2
    container_name: grafana
    restart: unless-stopped
    networks:
      - logging
    ports:
      - "3098:3000"
    volumes:
      - /var/lib/grafana:/var/lib/grafana
      - /etc/grafana/grafana-datasources.yml:/etc/grafana/provisioning/datasources/loki.yml:ro
    environment:
      - GF_AUTH_ANONYMOUS_ENABLED=true         # Remove if you want login
      - GF_AUTH_ANONYMOUS_ORG_ROLE=Admin       # Remove if you want login
      - GF_SECURITY_ADMIN_PASSWORD=changeme    # Change this
    depends_on:
      loki:
        condition: service_healthy