Agile Web Development with Rails (for Shrinivasan Mani) by Sam Ruby & Dave Thomas & David Heinemeier Hansson
Author:Sam Ruby & Dave Thomas & David Heinemeier Hansson
Language: eng
Format: epub
Tags: Pragmatic Bookshelf
ISBN: 1-934356-54-9
Publisher: The Pragmatic Bookshelf, LLC (275944)
Iteration K1: Deploying with Phusion Passenger and MySQL
So far, as we’ve been developing a Rails application on our local machine, we’ve probably been using WEBrick or Mongrel when we run our server. For the most part, it doesn’t matter. The rails server command will sort out the most appropriate way to get our application running in development mode on port 3000. However, a deployed Rails application works a bit differently. We can’t just fire up a single Rails server process and let it do all the work. Well, we could, but it’s far from ideal. The reason for this is that Rails is single-threaded. It can work on only one request at a time.
The Web, however, is an extremely concurrent environment. Production web servers, such as Apache, Lighttpd, and Zeus, can work on several requests—even tens or hundreds of requests—at the same time. A single-process, single-threaded Ruby-based web server can’t possibly keep up. Luckily, it doesn’t have to keep up. Instead, the way that we deploy a Rails application into production is to use a front-end server, such as Apache, to handle requests from the client. Then, you use the HTTP proxying of Passenger to send requests that should be handled by Rails to one of any number of back-end application processes.
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