This is an example of how to configure nginx to serve a meteor app.

meteor-nginx

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

  server_name app.example.com;

  return 301 https://$server_name$request_uri;
}

server {
  listen [::]:443 ssl http2;
  listen 443 ssl http2;

  server_name app.example.com;

  ssl on;
  ssl_certificate /etc/nginx/ssl/ssl.crt;
  ssl_certificate_key /etc/nginx/ssl/ssl.key;

  location = /favicon.ico {
    root /home/ubuntu/app/bundle/programs/web.browser/app;
    access_log off;
    expires 1w;
  }

  location ~* "^/[a-z0-9]{40}\.(css|js)$" {
    root /home/ubuntu/app/bundle/programs/web.browser;
    access_log off;
    expires max;
  }

  location ~ "^/packages" {
    root /home/ubuntu/app/bundle/programs/web.browser;
    access_log off;
  }

  location / {
    proxy_pass http://localhost:3000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $host;
  }
}

I tried your config @radlws but it shows me the nginx welcome page. Any suggestions ?

you should also serve static content from public which is found under bundle/programs/app