How to set up a container network with docker-compose?

Question

Computer networks

There are a number of services in different folders, each of them has its own compose file.
Running docker-compose up creates two separate networks, br-xxxxxxxxxxxx and vethxxxxxx, from which the services described in the compose file get addresses. (It would be nice to cut out the veth that I don't need)
Ie . how many compose files, so many networks are created.
I would like to organize only one network for containers so that they see each other and address each other by name.

Answer 1

I use docker-compose file version 2
Manually create
network Add network description to each file

networks:
  mynetwork:
    external:
      name: myglobalnetwork

We set aliases for services for networks through which containers will communicate

services:
  nginx:
    build: ./nginx
    networks:
      mynetwork:
        aliases:
          - nginx.mynetwork
  postgres:
    build: ./postgres
    networks:
      mynetwork:
        aliases:
          - postgres.mynetwork

Here nginx.mynetwork and postgres.mynetwork are the internal dns addresses of the containers