How to connect from docker-compose to Host PostgreSQL?

Question

I have a server with installed PostgreSQL. All my services work in containers (docker-compose). I want to use my Host PostgreSQL from containers. Buy I have the error:

  Unable to obtain Jdbc connection from DataSource (jdbc:postgresql://localhost:5432/shop-bd) for user 'shop-bd-user': Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  SQL State  : 08001
  Error Code : 0
  Message    : Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.

  Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
  Connection refused (Connection refused)

My docker-compose is using host network_mode, like this:

version: '3'
services:
  shop:  
    container_name: shop
    build: ./shop
    hostname: shop
    restart: always   
    ports:
      - 8084:8084
    network_mode: "host"

My database connection URL is: jdbc:postgresql://localhost:5432/shop-bd

Solution 1

Updated Apri, 2018

According to the document, from version 18.03 onwards, using host.docker.internal as DNS works for me, without specifying neither --net=host or network_mode: "host"

Solution 2

This would have worked if you were on linux OS. But this won't work on Mac or Windows. The thing is that when you use --net=host, you still are not on host network. That is the limitation of how docker for windows work

Instead of localhost you need to use docker.for.win.localhost as the host. This is a special DNS name which is available on Docker for Windows when you want to refer to the host localhost

Comments

[Max]

I use --net=host, so I can use localhost. I think, that the problem occurs because of Windows.

[whites11]

Yeah, you're right I missed that you are using host networking.

[Brendan Goggin]

Incredibly helpful. Please upvote and accept this answer!

[Max]

@BrendanGoggin sure

[030]

This is for development purpose and will not work in a production environment outside of Docker Desktop for Mac