multiple services trying to connect to the same db container - docker

Question

I have this docker-compose file:
version: "3.9"
services:
producer:
build:
context: ./producer
dockerfile: Dockerfile.producer
target: prod
ports:
- 8080:8080
env_file:
- ./producer/producer.env
depends_on:
- db
networks:
- network-db
cleanup:
build:
context: ./cleanup
dockerfile: Dockerfile.cleanup
target: prod
ports:
- 4040:4040
env_file:
- ./cleanup/cleanup.env
depends_on:
- producer
networks:
- network-db
db:
image: postgres
env_file:
- .env
volumes:
- postgres-data:/var/lib/postgresql/data
ports:
- 5432:5432
networks:
- network-db
restart: always
volumes:
postgres-data:
networks:
network-db:
driver: bridge
And in both of the producer and cleanup services' codebase, I try to connect to the same port, which is 5432, like so:
configData := fmt.Sprintf("postgres://%v:%v#%v:%v/%v?sslmode=disable",
pgUser,
pgPassword,
pgHost,
pgPort, // 5432
pgName,
)
GDB, err = gorm.Open(postgres.Open(configData), &gorm.Config{})
At the moment I get a connection refused error and I am assuming it is something to do with the port.
So my question is, can db image handle connections from multiple services on the same port (5432). If not, then what is the better way to solve the problem?
Btw, .env files should not be the source of the issue since they match.. (port=5432, host=db, etc.)