How to forward traffic from a container that lives in Swarm?

[marcusique]

Hi!

I'm running several containers on Caprover that operates in Swarm mode. In addition to that, I'm running my gluetun container outside of it and it works perfectly well. Now, I would like to forward traffic from one of my Caprover containers through the gluetun container. I was suggested to run a docker service update on that container to change the network it's using, something like this:

docker service update srv-captain--yourappname --network-rm captain-overlay-network --network-add .........

From this point, I wasn't sure what I was doing, but I tried the following and couldn't make it work

docker service update srv-captain--myappname --network-rm captain-overlay-network --network-add container:gluetun

Error: No such network: container:gluetun

docker service update srv-captain--myappname --network-rm captain-overlay-network --network-add service:gluetun

Error: No such network: service:gluetun

Could you help me with it?