Question

Subdomains pointing to same droplet in different ports?

Posted January 5, 2014 14.3k views
Hi, we would like to have 3 subdomains resolving to the same IP (same droplet) but pointing to 3 different servers that will be running on it. The servers were developed in GO programming language (golang). One domain will be the API serving on port X: api.domain.com Other one will be our Admin Dashboard on port Y: admin.domain.com And the last one will be our website running probably on port Z: www.domain.com How can we config the DNS to accomplish our desired setup? Can you help us with that? Thank you very much in advance.
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2 answers
kamaln7 January 5, 2014
Firstly, create a DNS record for each of the subdomains. The DNS records tell the browser which server/IP address it should connect to. Browsers assume port 80 by default.

In order to map each subdomain to a different port, you will need to use a reverse proxy such as nginx. https://www.digitalocean.com/community/articles/how-to-set-up-nginx-virtual-hosts-server-blocks-on-ubuntu-12-04-lts--3.

You will need to insert this into each virtualhost instead of the virtualhost config in the said article.
How To Set Up nginx Virtual Hosts (Server Blocks) on Ubuntu 12.04 LTS
by Etel Sverdlov
This tutorial shows you how to set up a new directory, how to grant the correct permissions, how to add content to a new page, how to turn on virtual hosting, and how to, if needed, set up local hosts. Virtual Hosts are used to run more than one website or domain off of a single server and IP address. When used with nginx, virtual hosts are called Server Blocks. This tutorial covers setting up server blocks on an Ubuntu server.
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  • alexbarbalex January 29, 2016

    Hi kamaln7

    I need same setup. Unfortunately your second link does not work (any more). Could you please explain again what would be the difference to direct to a subdomain?

    Thanks, Alex

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danielleccloss May 7, 2018
How To Set Up Nginx Server Blocks (Virtual Hosts) on Ubuntu 16.04
by Justin Ellingwood
When using the Nginx web server, server blocks (similar to the virtual hosts in Apache) can be used to encapsulate configuration details and host more than one domain off of a single server. In this guide, we'll discuss how to configure server blocks in Nginx on an Ubuntu...
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