How do I point my custom domain to my IP:Port (

Posted January 2, 2016 176.9k views

My word press app is working within a docker container with host port 8080 bound to the web container 80. I am able to access the app using the public IP with port 8080 (, but the app cannot be accessed using the only IP ( Secondly, I have pointed my custom domain to digital servers and have matched the droplet and the domain name, I have even created a cname record pointing to that custom domain. But I am unable to access my application using the domain name, and I am unable to access it using the domainename:8080.... I assume I should be able to access the web container with only the domain name.... Am I missing something? Even inside the server, curl localhost triggers an error with the message, the server refused connection on port 80.... but curl localhost:8080 works fine. Any suggestions?

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3 answers


DNS only handles domain -> IP mapping. It cannot map the default port (80) to a custom port–you will have to use a reverse proxy for that. nginx is one of the most popular reverse proxies that are used to do that.

First, add a DNS record for your subdomain.

Then, install nginx:

Add a new server block:

server {
    listen 80;

    location / {
        proxy_pass http://localhost:8080;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

Finally, enable it and restart nginx:

sudo ln -s /etc/nginx/sites-available/myapp /etc/nginx/sites-enabled/myapp
sudo service nginx configtest
sudo service nginx restart

You should now be able to browse to and see the contents of http://your droplet’s ip:8080.

by Justin Ellingwood
Nginx is one of the most popular web servers in the world. It is extremely flexible and powerful and can be used to efficiently host sites and applications small or large sites and applications. In this guide we'll cover how to install and set this up on an Ubuntu 14.04 server.

How can I do that without nginx? With .htaccess for instance?

  • If you are using Apache, you have two options, the first one is to add a redirection rule in your website’s .htaccess and the second one would be to do it directly in the Apache’s Vhost file. I like using the first option. In your .htaccess file, you can add the following rule

    RewriteEngine on

    redirect to 3000 if current port is not 3000 and “some-prefix/” is matched

    RewriteRule ^/(.*[^/])/?$$1/ [R=301,L]
    If you want to use Apache’s Vhost file, I’ll recommend going through the following tutorial :

    by Brennen Bearnes
    The Apache web server is the most popular way to serve web content on the internet. Apache has the ability to serve multiple domains from a single server by using a mechanism called "virtual hosts". If a virtual host is configured correctly for each domain, the web server can correctly route traffic to the appropriate files based on the domain name requested. In this guide, we'll demonstrate how to configure Apache virtual hosts on an Ubuntu 16.04 server.

If it says that there is IP not found, could this be a problem with the configuration of nginx or is this because of DNS configuration.