Thanks for the diagram. That’s quite a sophisticated setup - you’d do that if you had a good reason and knew the territory.
If you’re still seeing the following, I think that’s the indication of what’s wrong. Redis can’t open the port it needs to be listening on.
So the questions are about whether redis should be doing that, in this container, and if so, where else on the machine is another redis running. lsof might be a useful tool here.