nginx inside docker: mapping localhost:port in one container to another_container:port

[Sim Tov]

Hello,
I have a custom network and two containers A and B connected to it.
Container A (with Debian inside) runs nginx and an application that listens
to localhost:8083 and expects certain service there. Once deployed this
service runs in container B and not locally. For certain reasons I can't
change localhost to something else inside the application.

   1.

   How can I map localhost:8083 from A to name_of_container_B:8083 on the
   Docker/nginx/infrastructure/OS level? name_of_container_B is not known
   during creation of A image, but I can pass it as docker entrypoint
   parameter during launch of conatiner A.
   2.

   I prefer not to add additional packages in order not to increase overall
   complexity. So is it, for example, possible to configure nginx somehow to
   listen on localhost:8083 and forward it to name_of_container_B:8083?
   3.

   I actually use Ansible to start containers, so the solution needs to be
   applicable using Ansible?

Thank you!
Link to this question: https://stackoverflow.com/q/56356422/1876484
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