Django cannot connect to running postgres docker container - django

Question

I am surprised that I cannot get this to work, as I have run a django applications with a postgres DB in docker containers multiple times, however, this time on my Linux machine the django application cannot connect to the postgres docker container, whereas on my Mac the setup works without a problem.
I am getting the standard error:
django.db.utils.OperationalError: could not connect to server: Host is unreachable
Is the server running on host "postgresdb" (172.27.0.2) and accepting
TCP/IP connections on port 5432?
The postgres container is running and should be reachable. I check the IP address of the docker container and it seems correct. My docker-compose file looks like this:
version: "3.8"
services:
app:
container_name: data-management
restart: always
build: ./
ports:
- '3000:3000'
links:
- 'postgresdb'
volumes:
- ./:/usr/local/share/src/app
env_file:
- .dev.env
postgresdb:
container_name: be-postgres
restart: always
image: postgres:13.4-alpine
ports:
- '5432:5432'
volumes:
- postgres-db:/var/lib/postgresql/data
env_file:
- .dev.env
volumes:
postgres-db:
The configurations are stored in an environment file, which is used in both containers to avoid any mismatches.
POSTGRES_PASSWORD=devpassword123
POSTGRES_USER=devuser
POSTGRES_SERVICE=postgresdb
POSTGRES_PORT=5432
POSTGRES_DB=data_management
The django DB settings are as standard as they could be:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql',
'HOST': os.environ['POSTGRES_SERVICE'],
'NAME': os.environ['POSTGRES_DB'],
'PORT': os.environ['POSTGRES_PORT'],
'USER': os.environ['POSTGRES_USER'],
'PASSWORD': os.environ['POSTGRES_PASSWORD'],
}
}
I am out of ideas as what could be causing this as this happens only on my Fedora machine and there are no issues when running on my Mac. I have already had SELinux problems with some docker volumes in the past, however, after googling I could not find any suggestions that SELinux could be the culprit again.