Docker route traffic through vpn

Question

I am trying to dockerize my existing application which is having the following stack

• Python (Flask)
• Microsoft SQL server
• Celery
• Redis

Following are the relevant files

Dockerfile

FROM python:3.7
WORKDIR /opt/myapp

COPY myapp .
RUN pip install flask
RUN pip install --no-cache -r requirements/requirements.txt

docker-compose.yml *

version: "3"

services:
  web:
    build: .
    command: python run.py
    ports:
      - "5000:5000"

SQL server is not running as a docker container and it requires a VPN connection. Connection is being made from the code files itself. How can i connect to a non dockerized MS SQL running on some other server (need to be accessed with VPN) with dockerized application.

Answer 1

The simplest way, especially for development is to use Docker's host networking mode :

docker run --network host [image]

This bypasses Docker's network isolation and will use the underlying host routing for the container.