Thin : A fast and very simple Ruby web server

What

Thin is a Ruby web server that glues together 3 of the best Ruby libraries in web history:

• the Mongrel parser, the root of Mongrel speed and security
• Event Machine, a network I/O library with extremely high scalability, performance and stability
• Rack, a minimal interface between webservers and Ruby frameworks

Which makes it, with all humility, the most secure, stable, fast and extensible Ruby web server bundled in an easy to use gem for your own pleasure.

Installation & Usage
Minimum Requirements include either Ruby 1.86 or 1.9. Love that last bit about 1.9.

sudo gem install thin

Using with Rails

After installing the Gem, a thin script should be in your path to easily start your Rails application.

cd to/your/rails/app
thin start    But Thin can also load Rack config file so you can use it with any
framework that supports Rack. Even your own that is, like, soooo much
better then Rails, rly!

test.ru

app = proc do |env|
  [
    200,          # Status code
    {             # Response headers
      'Content-Type' => 'text/html',
      'Content-Length' => '2',
    },
    ['hi']        # Response body
  ]
end

# You can install Rack middlewares
# to do some crazy stuff like logging,
# filtering, auth or build your own.
use Rack::CommonLogger

run app

thin start -r test.ru  See Rack doc for more.

Deploying

Deploying a cluster of Thins is super easy. Just specify the number of servers you want to launch.

thin start --servers 3

You can also install Thin as a runlevel script (under /etc/init.d/thin) that will start all your servers after boot.

sudo thin install

and setup a config file for each app you want to start:

thin config -C /etc/thin/myapp.yml -c /var/...

Run thin -h to get all options.

Behind Nginx

Check out this sample Nginx config file to proxy requests to a Thin backend.

then start your Thin cluster like this:

thin start -s3 -p 5000

You can also setup a Thin config file and use it to control your cluster:

thin config -C myapp.yml -s3 -p 5000
thin start -C myapp.yml           ----------

To connect to Nginx using UNIX domain sockets edit the upstream block

in your nginx config file:

nginx.conf

      upstream  backend {
   server   unix:/tmp/thin.0.sock;
   server   unix:/tmp/thin.1.sock;
   server   unix:/tmp/thin.2.sock;
}

and start your cluster like this:

    thin start -s3 --socket /tmp/thin.sock       --------------   Quoted from  code.macournoyer.com