Nginx Thin Clustered Mode Configuration

nginx-config

# You may add here your
# server {
#	...
# }
# statements for each of your virtual hosts to this file

##
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# http://wiki.nginx.org/Pitfalls
# http://wiki.nginx.org/QuickStart
# http://wiki.nginx.org/Configuration
#
# Generally, you will want to move this file somewhere, and start with a clean
# file but keep this around for reference. Or just disable in sites-enabled.
#
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
##

upstream domain1 {
    server 127.0.0.1:3000;
    server 127.0.0.1:3001;
    server 127.0.0.1:3002;
}

server {
    listen 80;
    return 301 https://$host$request_uri;
    listen [::]:80 default_server ipv6only=on;

    # Make site accessible from http://localhost/
    # server_name localhost;

    location / {
        # First attempt to serve request as file, then
        # as directory, then fall back to displaying a 404.
        try_files $uri $uri/ =404;
        # Uncomment to enable naxsi on this location
        # include /etc/nginx/naxsi.rules
    }

    # Only for nginx-naxsi used with nginx-naxsi-ui : process denied requests
    #location /RequestDenied {
    #	proxy_pass http://127.0.0.1:8080;    
    #}
    
    #error_page 404 /404.html;
    
    # redirect server error pages to the static page /50x.html
    #
    #error_page 500 502 503 504 /50x.html;
    #location = /50x.html {
    #	root /usr/share/nginx/html;
    #}
    
    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #	fastcgi_split_path_info ^(.+\.php)(/.+)$;
    #	# NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
    #
    #	# With php5-cgi alone:
    #	fastcgi_pass 127.0.0.1:9000;
    #	# With php5-fpm:
    #	fastcgi_pass unix:/var/run/php5-fpm.sock;
    #	fastcgi_index index.php;
    #	include fastcgi_params;
    #}
    
    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #	deny all;
    #}
}

# HTTPS server
#
server {
    listen 443;
    server_name thedomain;

    root   /path/to/railsapp/public/;
    index  index.html;

    ssl on;
    ssl_certificate /etc/nginx/ssl/server.crt;
    ssl_certificate_key /etc/nginx/ssl/server.key;
    location / {
        proxy_set_header  X-Real-IP  $remote_addr;
        proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_redirect false;

        if (-f $request_filename/index.html) {
            rewrite (.*) $1/index.html break;
        }

        if (-f $request_filename.html) {
            rewrite (.*) $1.html break;
        }

        if (!-f $request_filename) {
            proxy_pass http://domain1;
            break;
        }
    }
}

Procfile

web: thin -C railsapp.yml start

thinapp.yml

---
chdir: "/path/to/railsapp"
environment: production
address: 0.0.0.0
port: 3000
timeout: 30
log: "/path/to/railsapp/log/thin.log"
pid: tmp/pids/thin.pid
max_conns: 1024
max_persistent_conns: 100
require: []
wait: 30
threadpool_size: 20
servers: 3
daemonize: true

For this to work, set thedomain at https://gist.github.com/jsyeo/022f48a165b77442a362#file-nginx-config-L82 to your domain name, e.g. domain.com and set /path/to/railsapp to your rails application's root path.