Setting-up sub-domain with Nginx

How can I set up sub-domains in Nginx?

Things I have set-up already"

  • Nginx running a Ruby rack app

  • DNS set-up with DigitalOcean

How do I create a sub-domain to root to another ruby app?

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To do this you would:

1.) Create an A record on your existing domain in the DNS system for your new subdomain and point it to your droplet’s IP.

2.) Create a second (non-default) server {} block in your nginx configuration pointing to your second app.

3.) Restart nginx with the command:

service nginx restart

Very simple steps

  1. Create a folder “” in /var/www/html/

  2. Create a config file “” in etc/nginx/site-availabe

server {
        listen 80;
        listen [::]:80;

        root /var/www/html/;
        index index.php index.html index.htm index.nginx-debian.html; 


        location / {
                try_files $uri $uri/ =404;
		location ~ \.php$ {
		    #NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
		    include fastcgi_params;                
		    fastcgi_intercept_errors on;
		    fastcgi_pass unix:/run/php/php7.2-fpm.sock;
		    fastcgi_param SCRIPT_FILENAME 

Note php7.2-fpm may be change by your using php version 3. Run

ln -s /etc/nginx/sites-available/ /etc/nginx/sites-enabled/
  1. Test configuration sudo nginx -t
  2. Restart the Nginx server:
sudo systemctl restart nginx

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