compose.yml

services:

  setup:
    image: docker:cli
    volumes:
      - ./swarm-init.sh:/swarm-init.sh
      - ./nginx.yml:/nginx.yml
      - manager-docker:/var/run # Mount the volume (directory) containing docker.sock
    environment:
      - DOCKER_HOST=unix:///var/run/docker.sock
      - DOCKER_TLS_CERTDIR=""
    command: /bin/sh /swarm-init.sh
    depends_on:
      manager:
        condition: service_healthy
    networks:
      - swarm-net

  manager:
    image: docker:dind
    privileged: true
    environment:
      DOCKER_TLS_CERTDIR: ""
    command: dockerd --host=unix:///var/run/docker.sock --host=tcp://0.0.0.0:2375
    volumes:
      - manager-docker:/var/run
    ports:
      - "7777:7777"
      - "8888:8888"
      - "9999:9999"
    networks:
      - swarm-net
    healthcheck:
      test: [ "CMD", "docker", "info" ]
      interval: 5s
      timeout: 3s
      retries: 5

  agent:
    container_name: agent
    hostname: agent
    build:
      context: ../../
    command: bun --watch run src/index.ts
    volumes:
      - ../../:/usr/src/app
      - manager-docker:/var/run:rw
    ports:
      - "3000:3000"
    env_file: ../../.env
    networks:
      - swarm-net
    depends_on:
      manager:
        condition: service_healthy
      setup:
        condition: service_completed_successfully

volumes:
  manager-docker:

networks:
  swarm-net:
    driver: bridge

swarm-init.sh

#!/bin/bash

# Initialize swarm manager (running inside setup container with manager socket mounted)
MANAGER_IP=$(getent hosts manager | awk '{ print $1 }')

# Check if already initialized
if ! docker info | grep -q "Swarm: active"; then
    echo "Initializing Swarm at $MANAGER_IP..."
    docker swarm init --advertise-addr $MANAGER_IP
else
    echo "Swarm already initialized."
fi

echo "Swarm initialized"