version: '3.8'

# Deploy with:
#   docker stack deploy -c nats.yml nats
#
# Runs on: pve-tools
# JetStream enabled for persistent messaging.
# Services connect to nats_nats:4222 via overlay, or host:4222 externally.

services:
  nats:
    image: nats:latest
    command:
      - -c=/etc/nats/nats.conf
    ports:
      - target: 4222
        published: 4222
        protocol: tcp
        mode: host
      - target: 8080
        published: 8080
        protocol: tcp
        mode: host
      - target: 8222
        published: 8223
        protocol: tcp
        mode: host
    volumes:
      - nats_data:/data
    configs:
      - source: nats_conf
        target: /etc/nats/nats.conf
    networks:
      - overlay-net
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.hostname == pve-tools
      restart_policy:
        condition: on-failure
        delay: 5s
        max_attempts: 3

configs:
  nats_conf:
    file: ./nats.conf

volumes:
  nats_data:

networks:
  overlay-net:
    external: true
    name: ${OVERLAY_NETWORK:-homelab-net}