Docker compose and Service communication - node.js

Question

I have a docker-compose with 5 services that have to communicate.
I checked whether they would be in the same network using docker network inspect networkname_dafult
and I could find all the apps there in the same network.
The result of inspect returned a json with a name property.
```"Name": "app_1",```
In each service I am using that name to make http requests but they return
"connect ECONNREFUSED 127.0.0.1:5003" for example.
If I access localhost:5003 it works, and it will work for each service.
If i try to make the http requests from my apps using localhost:port it wont work either.
My dockercompose.yml
version: "3.7"
services:
App1:
image: user/app1
ports:
- 5001:5001
links:
- App2
- App3
- App4
- App5
hostname: app1
App2:
image: user/app2
ports:
- 5002:5002
hostname: app2
App3:
image: user/app3
ports:
- 5003:5003
hostname: app3
App4:
image: user/app4
ports:
- 5004:5004
hostname: app4
App5:
image: user/app5
ports:
- 5005:5005
hostname: app5
I tried to make the http requests using the hostname, Appx and etc... I cant make them communicate with each other.
What might I be missing here?

Answer 1

Create a network and assign all the parts of the service to that network. One example:
version: '3.7'
networks:
app_net:
driver: bridge
services:
App1:
image: user/app1
ports:
- 5001:5001
networks:
- app_net
hostname: app1
App2:
image: user/app2
ports:
- 5002:5002
networks:
- app_net
hostname: app2
App3:
image: user/app3
ports:
- 5003:5003
networks:
- app_net
hostname: app3
App4:
image: user/app4
ports:
- 5004:5004
networks:
- app_net
hostname: app4
App5:
image: user/app5
ports:
- 5005:5005
networks:
- app_net
hostname: app5
But it might be that I'm missing something. Another thing to consider is using links - more info here. Also, if you are going to copy+paste this code, take care about indentation.

Answer 2

Docker-compose already creates a default network.
I ran docker network ls to see which networks were available
and used docker network inspect mynetwork to see if the apps on my docker-compose were running on the same network (They will be).
The result of docker network inspect is an array of containers objects.
Each container object has a name property (That was the information I nedded to make http connections between services)
"Containers": {
"01fcacc2b2dc8450c5c75e": {
"Name": "myapp_1",
"EndpointID": "9e3fa9633d9d1692d4f7120c",
"MacAddress": "00:00:00:00:00:00",
"IPv4Address": "172.33.0.2/16",
"IPv6Address": ""
},
On each service I was performing http requests I used that property name to make the requests.
axios.get(http://myapp_1)
An important detail was to rebuild my container after changing it!
docker build -t myapp .
When I ran docker-compose again everything worked.