SpringBoot in Docker not connecting to Mongo in Docker

Question

I have a Spring Boot Application and developed it with a mongo db which was running in brew services.

To get a connection to the db I just had to put the following

Answer 1

Try the following docker-compose.yml. hostname should fix your problem

version: '3'
services:
  mongo:
    container_name: docker-mongo
    image: mongo:latest
    ports:
     - "27017:27017"
    volumes:
     - ./data/db:/data/db
    hostname: mongo

 spring:
   depends_on:
    - mongo
   image:docker-spring-http-alpine
   ports:
    - "8080:8080"
   hostname: spring
   links:
    - mongo