bind hostname to container docker

Question

I'm tiring to create new docker container like this:

docker run -d -p5050:443 --name=free-proxy -v proxy-config:/data -e telegrammessenger/proxy:latest

this command successfully created a new container. now i want to restrict this container, to only work with host name not IP address. i try this command:

docker run -d -ptest.com:5050:443 --name=fourth-proxy -v proxy-config:/data -e telegrammessenger/proxy:latest

but i get this error:

docker: Invalid ip address: test.com.

i just want my container only work with host name (not IP address.)

NOTE: i want to access to my container from outside with just host name. if the clients use IP address they cant use the proxy:

tg://proxy?server=4.2.2.4&port=5050 (not acceptable)
tg://proxy?server=test.com&port=5050 (acceptable)

Answer 1

Docker publishes ports at the L4 layer, it is not looking at the L7 data that could contain the hostname. The only thing you have when listening on tcp/ip ports is the port number and the network interface (represented by the ip address).

To filter by hostname, you'll need to either place this logic in your application, or setup a proxy in front of your application to do the filtering. There are several reverse proxies that could do this, including traefik, nginx, and haproxy.