docker-compose: access from docker container to localhost

Question

I have a service that runs inside a docker container. This service need to accesses the database that is run in another cluster (I use kubectl port-forward and after it I access database in localhost:5432)

Here is my docker-compose file

version: '3'

services:
  api:
    build: .
    ports:
      - "8000:8000"
      - "5432:5432"
    environment:
      - APP_PORT=8000 
      - DB_SERVER=localhost
      - DB_PORT=5432
      - DB_USER=postgres
      - DB_PASSWORD=mypassword

It seems that redirection of port 5432 does not work as expected because connection to database fails inside the container. Could you help me to understand what's going wrong?

Michał Ochociński · Accepted Answer · 2018-05-22 10:03:54Z

2

In current context, localhost is api container address. You have to set DB_SERVER for correct address. Your service and database has to be in the same docker network and then you can use internal docker address resolver. After that, you should set DB_SERVER=postgres. Another way, you can set DB_SERVER to your host address.

This is how you can define network in docker-compose: https://docs.docker.com/compose/networking/#use-a-pre-existing-network

answered May 22, 2018 at 10:03

Michał Ochociński

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