Dockers Sharing IP Address

[NeoDude]

I'm loving that you can now assign Dockers their own IP. But is it possible to have more than one docker on the same IP?

[bonienl]

Bridge and host networks allow containers to use the same (host) IP address.

 

Custom (macvlan) networks are intented to have unique addresses for each container.

 

[NeoDude]

Yep, I know that I can share the Host's IP, that's the default setting. But is there any way to have say NZBget, Lidarr, Radarr & Sonarr all on br0 using the same shared IP?

[NeoDude]

Bump. Anybody know how I can do this? Ideally, I'd like to have NZBget, Deluge, Jackett, Radarr, Sonarr & Lidarr all use the same IP address (Separately from the UnRaid IP). 

[ken-ji]

This involves a custom bridge network and quite some manual iptables trickery.

What's the exact use case for this?

 

[NeoDude]

I have multiple VPN Gateways set up on my router (PfSense) and would like to route all NZBget, Deluge, Jackett, Radarr, Sonarr & Lidarr traffic via one of these gateways. The easiest way from a PfSense point of view would be to have them all using the same IP which I can then route via the gateway.

 

The alternative I suppose is to have each separate docker with its own IP, just seemed a bit of a waste if there was an easy way to have them share. I've also tried this previously and had trouble getting my dockers to talk to each other, specifically Radarr, Sonarr & Lidarr having trouble connecting with NZBget when it wasn't on localhost.

Edited April 27, 2018 by NeoDude