How to get the real ip of the user inside the docker container?

Question

Nginx

I'm building a docker image based on "ubuntu:16.04". I raise nginx in it with the simplest configuration:

server {
  listen 80;

  location / {
    return 200 'Remote addr = ${remote_addr}, X-Forwarded-For = ${proxy_add_x_forwarded_for}';
  }
}

I raise the container:
docker run --name=mycontainer -p 80:80 -d myimage
When making requests to the server, the response is:

"Remote addr = 172.17.0.1, X-Forwarded-For = 172.17.0.1"

where "172.17.0.1" is the address from the docker internal network, not the real ip of the client that made the request.
How can I get the real ip of a user?
You can, of course, specify "--net=host" when starting the container, but this is inconvenient, because the possibility of binding the container port to an arbitrary host port is lost.

Answer 1

When asked from where? It looks like you're on the internal network and making requests, otherwise X-Forwarded-For would be different. Make a request to the public IP of the server.