Docker connect 2 containers with network_mode: service:...

Inspiration: https://stackoverflow.com/questions/51305397/docker-compose-network-modeservice-2-containers-cant-talk-to-each-other

If you have 2 container that is using another container as network_mode in docker this container gets the same IP as the service container. So for example you have this setup:

---
version: "2.1"
services:

  gateway:
    ...
    cap_add:
      - NET_ADMIN
    devices:
      - /dev/net/tun:/dev/net/tun
    ports:
      - 1001:1001 # container a
      - 2001:2001 # container b


  a:
    ...
    network_mode: service:gateway

  b:
    network_mode: service:gluetun

Now you want to curl container b from container a for example.

You can easily access container b with a curl by using localhost.

Example:

curl http://localhost:2001/api

I know this sounds absurd. But it works.

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