CODEWITHSUNDEEP
dockerdocker-composedocker-swarm
Vitalii
Vitalii

Reputation: 179

How link web frontend to backend

How I can automatically pass backend link\ip for frontend ?

I have two services:

services:
  core:
    restart: always
    volumes:
      - pws.vlm.logs:/var/www/pws/logs
    networks:
      - pws-net
    environment:
      DB_URL: postgres://pws_pg_user:${DB_PASSWORD:-default_password}@postgres/pws
      NODE_ENV: ${NODE_ENV:-production}
      JWT_SECRET: ${JWT_SECRET}
    depends_on:
      - postgres
    ports:
      - 3100:3080
  web:
    restart: always
    volumes:
      - pws.vlm.logs:/var/www/pws/logs
    networks:
      - pws-net
    environment:
      NODE_ENV: ${NODE_ENV:-production}
      API_URL: ${API_URL:-http://127.0.0.1:3100}
    depends_on:
      - core
    ports:
      - 3000:3080

If I want to make api calls from frontend to backend I need to take ip address from host or domain name and pass it to web container as API_URL, Is there some opportunity to use docker networks to pass link to backend by container name, so I can set API_URL=core and It automatically substitute on ip or domain ?

Upvotes: 0

Views: 140

Answers (2)

7_R3X
7_R3X

Reputation: 4370

Your service names (core and web) act as the DNS entries. You can use http://core:3100/api from frontend to access the services of backend.

Upvotes: 1

mbuechmann
mbuechmann

Reputation: 5770

Docker compose orchestrates the containers so that they contact each other directly. Just use the used name of the backend as hostname, in this case core. You still have to append the port, but the backend is reachable under http://core:3100

so the entry for web would look like this:

  web:
    restart: always
    volumes:
      - pws.vlm.logs:/var/www/pws/logs
    networks:
      - pws-net
    environment:
      NODE_ENV: ${NODE_ENV:-production}
      API_URL: http://core:3100
    depends_on:
      - core
    ports:
      - 3000:3080

Upvotes: 2

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