On AWS Lightsail, I am trying to establish communication between the backend and the database containers.

Here is my setup:

However, the result is different from my test on the local machine.

docker-compose.yml on local machine:

version: '3.8'

services:
  database:
    image: mongo:latest
    container_name: mongo_database
    environment:
      MONGO_INITDB_ROOT_USERNAME: username
      MONGO_INITDB_ROOT_PASSWORD: password123
    ports:
      - "27017:27017"
    networks:
      - backend_network

  backend:
    image: custom_backend:latest
    container_name: backend_service
    environment:
      MONGO_URI: mongodb://username:password123@database:27017/
    ports:
      - "4000:4000"
    depends_on:
      - database
    networks:
      - backend_network

networks:
  backend_network:
    driver: bridge

This setup runs successfully on my local machine.

Lightsail’s backend log (ERROR):

[8/Jul/2024:15:00:15] [deployment:1] Creating your deployment
[8/Jul/2024:15:01:21] Running the application...
[8/Jul/2024:15:01:49] [deployment:1] Started 1 new node
[8/Jul/2024:15:02:45] Running the application...
[8/Jul/2024:15:03:25] [deployment:1] Health checks failed: port 4000 is unhealthy
[8/Jul/2024:15:03:46] make: *** [Makefile:3: run] Terminated
[8/Jul/2024:15:04:58] [deployment:1] Took too long
[8/Jul/2024:15:06:01] make: *** [Makefile:3: run] Terminated

localhost’s log (SUCCEED):

backend$ docker compose logs backend
backend_service  | Running the application...
backend_service  | INFO 2024/07/08 15:30:48 Starting server on http://localhost:4000
backend_service  | 2024/07/08 15:30:50 [0165dc51d9d0/fprkUHXqaT-000001] "GET http://localhost:4000/ HTTP/1.1" from 172.18.0.1:36804 - 200 25B in 35.389µs

I also see no networks or depends_on options on Lightsail. I am not sure if that is causing this issue, but I couldn’t find those configurations on the Lightsail dashboard.