MongoNetwork ECONNREFUSED when renaming service and database - reactjs

Question

I have a problem starting mongodb with Docker. I have some code which i want to reuse for different purpose. After i made a copy of that code everything worked just fine but after renaming the service, database and building everything again with
docker-compose -f docker-compose.dev.yml build
and running with
docker-compose -f docker-compose.dev.yml up
mongodb won't start and i get the ECONNREFUSED error. I tried to remove all the services and containers with
docker-compose -f docker-compose.dev.yml rm
docker rm $(docker ps -a -q)
but nothing seems to help. I also tried to discard all the changes i made (to the point where it worked) but it still doesn't work. I am quite new to programming itself and have no idea what is happening. What am i missing?
Also including my config.js, .env and docker-compose.dev.yml files.
Config.js
const config = {
http: {
port: parseInt(process.env.PORT) || 9000,
},
mongo: {
host: process.env.MONGO_HOST || 'mongodb://localhost:27017',
dbName: process.env.MONGO_DB_NAME || 'myresume',
},
};
module.exports = config;
.env
NODE_ENV=development
MONGO_HOST=mongodb://db:27017
MONGO_DB_NAME=myresume
PORT=9001
docker-compose.dev.yml
version: "3"
services:
myresume-service:
build: .
container_name: myresume-service
command: npm run dev
ports:
- 9001:9001
links:
- mongo-db
depends_on:
- mongo-db
env_file:
- .env
volumes:
- ./src:/usr/myresume-service/src
mongo-db:
container_name: mongo-db
image: mongo
ports:
- 27017:27017
volumes:
- myresume-service-mongodata:/data/db
environment:
MONGO_INITDB_DATABASE: "myresume"
volumes:
myresume-service-mongodata:

Answer 1

I am not completely sure but I think that your service needs the env var
MONGO_HOST=mongodb://mongo-db:27017 instead of the one that you have. The two services are only visible to each other that way. I believe you also need a network to connect the two of them.
something like this:
version: "3"
networks:
my-network:
external: true
services:
myresume-service:
build: .
container_name: myresume-service
command: npm run dev
ports:
- 9001:9001
links:
- mongo-db
depends_on:
- mongo-db
env_file:
- .env
volumes:
- ./src:/usr/myresume-service/src
networks:
- my-network
mongo-db:
container_name: mongo-db
image: mongo
ports:
- 27017:27017
volumes:
- myresume-service-mongodata:/data/db
environment:
MONGO_INITDB_DATABASE: "myresume"
networks:
- my-network
volumes:
myresume-service-mongodata:
you probably need to create the network using the command:
docker network create my-network