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[docker compose help] Is it possible to map ports when using network_mode? (lemmy.kde.social)

submitted 2 years ago by tubbadu@lemmy.kde.social to c/selfhosted@lemmy.world

8 comments fedilink hide all child comments

Hello everybody! I have the following issue: I have two countainers, let's call them C1 and C2, and they both expose the same port, let's say 1234. I want to route both of them through a gluetun container. to do this, I added

network_mode: container:gluetun

at each container. But they both expose the same port, so there's a conflict. Without routing them though gluetun I can just

ports:
  - 1235:1234

but using network_mode this cannot be done. What can I do? The only thing that comes to my mind is to use two gluetun containers, but I'd rather use a single one

thanks in advance!

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[–] Fedegenerate@lemmynsfw.com 5 points 2 years ago* (last edited 2 years ago) (1 children)

On mobile so you'll have to forgive format jank.

It depends how each image handles ports if C1 has the ports set up as 1234:100 and C2 has the ports set up as 1234:500 then:

service:

gluetun:

ports:
 - 1234:100 #c1
 - 1235:500 #c2
[...]

Will solve the conflict

Sometimes an image will allow you to edit it's internal ports with an environment so

service:

gluetun:

ports:
  - 1234:1000 #c1
  -1235:1234 #c2
c1:

environent:
- UI_PORT=1000
[...]

When both contsiners use the same second number, C1: 1234:80, C21235:80, and neither documents suggest how to change that port, I personally haven't found a way to resolve that conflict.

[–] tubbadu@lemmy.kde.social 2 points 2 years ago

thanks for the detailed reply!

When both contsiners use the same second number, C1: 1234:80, C21235:80, and neither documents suggest how to change that port, I personally haven’t found a way to resolve that conflict.

unfortunately I'm in this situation, so I guess my only ways are to modify the container by hand or to create two instances of gluetun. thank you very much for your help!