Heroku

How It Works

About the Argent Aspen Stack

Last Updated: 26 January 2012

aspen

This article only applies to apps on the Aspen stack. The most recent stack is Cedar.

Table of Contents

A stack is a complete deployment environment, including the base OS and all associated libraries.

The Aspen platform stack is composed of widely deployed open source software:

  • Operating System: Debian 4.0
  • Ruby Version: MRI 1.8.6
  • Ruby App Server: Thin
  • Web Server: Nginx 0.6.32

Pre-installed Gems

While applications running on Aspen can install any number of custom gems, the stack comes with a large number of gems pre-installed. You can view the comprehensive list of gems at any time on installed-gems.heroku.com.