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Why I need include port with the domain/ip ?

Posted July 5, 2016 7.1k views
Ruby on RailsUbuntuGetting StartedDigitalOceanDNSDokku

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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siwsonu
By:
siwsonu

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1 answer
ryanpq July 5, 2016

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
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  • siwsonu July 6, 2016

    Hi @ryanpq. dokku brings by default nginx, when I ssh the app and go to /etc/nginx there is no folder with the name “sites-enabled” but there’s a file nginx.conf and this is what contains:

    user www-data;
worker_processes 4;
pid /run/nginx.pid;

events {
        worker_connections 768;
        # multi_accept on;
}

http {

        ##
        # Basic Settings
        ##

        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 65;
        types_hash_max_size 2048;
        # server_tokens off;

        # server_names_hash_bucket_size 64;
        # server_name_in_redirect off;

        include /etc/nginx/mime.types;
        default_type application/octet-stream;

        ##
        # Logging Settings
        ##

        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        ##
        # Gzip Settings
        ##
        gzip_disable "msie6";

        # gzip_vary on;
        # gzip_proxied any;
        # gzip_comp_level 6;
        # gzip_buffers 16 8k;
        # gzip_http_version 1.1;
        # gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascri$

        ##
        # nginx-naxsi config
        ##
        # Uncomment it if you installed nginx-naxsi
        ##

        #include /etc/nginx/naxsi_core.rules;

        ##
        # nginx-passenger config
        ##
        # Uncomment it if you installed nginx-passenger
        ##

        #passenger_root /usr;
        #passenger_ruby /usr/bin/ruby;

        ##
        # Virtual Host Configs
        ##

        include /etc/nginx/conf.d/*.conf;
        include /etc/nginx/sites-enabled/*;
}
#mail {
#       # See sample authentication script at:
#       # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
#       # auth_http localhost/auth.php;
#       # pop3_capabilities "TOP" "USER";
#       # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
#       server {
#               listen     localhost:110;
#               protocol   pop3;
#               proxy      on;
#       }
#
#       server {
#               listen     localhost:143;
#               protocol   imap;
#               proxy      on;
#       }
#}

    In the directory /home/dokku/my-app/ there is another nginx.conf:

    server {
 listen      [::]:22445;
 listen      22445;

 access_log  /var/log/nginx/<my-app>-access.log;
 error_log   /var/log/nginx/<my-app>-error.log;

 location    / {

   gzip on;
   gzip_min_length  1100;
   gzip_buffers  4 32k;
   gzip_types    text/css text/javascript text/xml text/plain text/x-component$
  gzip_vary on;
  gzip_comp_level  6;

  proxy_pass  http://<my-app>-5000;
  proxy_http_version 1.1;
  gzip on;
  gzip_min_length  1100;
  gzip_buffers  4 32k;
  gzip_types    text/css text/javascript text/xml text/plain text/x-component$
  gzip_vary on;
  gzip_comp_level  6;

  proxy_pass  http://<my-app>-5000;
  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "upgrade";
  proxy_set_header Host $http_host;
  proxy_set_header X-Forwarded-Proto $scheme;
  proxy_set_header X-Forwarded-For $remote_addr;
  proxy_set_header X-Forwarded-Port $server_port;
  proxy_set_header X-Request-Start $msec;
}
 include /home/dokku/<my-app>/nginx.conf.d/*.conf;

    In this last file if I change the listen to 80 nothing happens, and when I restart or rebuild the app it changes back to 22445.

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