Question

Why I need include port with the domain/ip ?

Hi, I just create a droplet using dokku and deploy a RoR app, the problem is that only with the ip addres the web app doesn’t open, the browser show this message “This webpage is not available”, only if I specify the port it work (e.g. 100.201.202.203:50000). I add a domain and its the same, only work with the port (e.g www.something.com:50000). Someone know why is this happening and how can I fix it?

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When you use a URL without a port included your browser assumes it is port 80 (or 443 for HTTPS). Using anything else requires it to be specified. Generally with modern apps using Rails, a JavaScript framework or something other than static HTML or PHP scripts you will use a reverse proxy web server in front of the app to process requests (this also automatically gives you nice standard access logs). What you can do is:

First install nginx

sudo apt-get update;
sudo apt-get install nginx;

Then once it’s installed, edit the nginx configuration file in /etc/nginx/sites-enabled/ so it reads like:

server {
        listen   80; 
        server_name example.com; 
        
     location / {      
        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $host;
        proxy_pass http://127.0.0.1:50000;

     }
}

Then restart nginx:

service nginx restart