How to point a subdomain to a specific IP with Apache?

Hello, I have a simple python app inside a docker container that exposes port 8081. If I visit my.droplet.ip:8081 the app shows up. Now, I want the app to be on sub.mydomain.tld. Please note that I am running Apache2 and mydomain.tld is not hosted on my droplet. How may I approach the problem?

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What you need to do is setup proxying. This can be done with Apache using mod_proxy and there’s a guide for exactly that here at DigitalOcean.

Without using a proxy, which internally accepts requests for or and serves (or any application running on a port, just an example), you’d need to keep the ports in the URL’s.

You create an A-Record in your DNS panel that points to the desired IP address.