How to run stand-alone traefik with multiple domains

I want to run two Drupal projects with docker4drdupal with stand-alone trefik container.

I was doing this by the instructions:
https://wodby.com/docs/stacks/drupal/local/#single-port
https://docs.traefik.io/getting-started/quick-start/

I had this structure:

• /var/www/project1
• — docker-compose.yml
• /var/www/project2
• — docker-compose.yml
• /var/www/traefik
• — docker-compose.yml

I comment out a traefik container in both project’s docker-compose files:

#  traefik:
#    image: traefik
#    container_name: "${PROJECT_NAME}_traefik"
#    command: -c /dev/null --web --docker --logLevel=INFO
#    ports:
#      - '8000:80'
##      - '8080:8080' # Dashboard
#    volumes:
#      - /var/run/docker.sock:/var/run/docker.sock

After that, I ran both projects without traefik containers.

cd /var/www/project1
docker-compose up -d 
cd /var/www/project2
docker-compose up -d

Then I started writing a docker-compose.yml file for traefik. Let me explain how I was writing that.

In first step I ran the command

docker network ls

And there I found that Docker created two networks after I ran these two projects:

project1_default
project2_default

So I can use them in for my traefik container.

I wrote this file: /var/www/traefik/docker-compose.yml

version: ‘3’
services:
  traefik:
  image: traefik:v2.0
  command: — api.insecure=true — providers.docker
  networks:
    — project1_default
    — project2_default
  ports:
    — ‘80:80’
    — ‘443:443’
    — ‘8080:8080’
  volumes:
    — /var/run/docker.sock:/var/run/docker.sock
networks:
 project1_default:
   external: 
     name: project1_default
 project2_default:
   external: 
     name: project2_default

and ran it

cd /var/www/traefik
docker-compose up -d

After all I wanted to check is it working, so I go to
http://localhost:8080/api/rawdata
And there I found something like this:

routers:
  ...
  nginx-project1@docker
    service: "nginx-project1"
    rule: "Host(`nginx-project1`)"
    status: "enabled"
    using:
      0: http
      1: traefik

Now we know the domain for first project. Let’s go to /etc/hosts

sudo nano /etc/hosts

and write there this line with the host from http://localhost:8080/api/rawdata

127.0.0.1 nginx-project1

and save it.

Then we can go to http://nginx-project1 url in browser and see our project1.