Knowledge Base/Engine Yard Cloud Documentation/Engine Yard Gentoo 12.11

Engine Yard Gentoo 12.11 Technology Stack

Keri Meredith
posted this on January 28, 2013 12:24 PM

This Engine Yard technology stack is specifically for the Engine Yard Gentoo 12.11 OS distribution and applies to languages supported in the Engine Yard Cloud UI.

Each component in the stack has been customized and optimized over thousands of developer hours by engineers at Engine Yard; our engineers include leading Ruby on Rails and PHP contributors, expert cluster engineers, and seasoned DBAs for web server performance, database efficiency, and long-term scalability. We meticulously test and fully integrate each new component and component update to provide reliability, security, and compatibility within the stack.

You can confidently deploy and manage your application with any Engine Yard product. Read about the many benefits of using our Platform as a Service. Engine Yard also provides add-on services to extend your environments and apps. Engine Yard add-ons include more stack and database options like MongoDB.

Note: For clarity, since we now have 2 Gentoo stacks, we refer to this stack as the "Engine Yard Gentoo 12.11" stack. You can access it by using the Stack select field in the Environment UI:


Updated: April 3rd, 2014

The versions listed below are the current-state. We will continually update this list with the latest verified versions.

In the table below, Engine Yard Gentoo 12.11 verified versions appear in green.

Engine Yard Early Access versions appear in yellow. Limited Access versions in red.

For more information, see Engine Yard Early Access.

  Engine Yard
Gentoo 12.11 Recommended
Engine Yard
on AWS
      Versions to avoid
and other comments



  • 1.9.3.p484
  • 2.0.0.p353
  • 1.9.3.p484

Ruby 2.0.x requires this stack.

Ruby 1.8.6, 1.9.1, 1.9.2 not supported on this stack.

  • 2.0.0-RC2
  • 2.0.0-RC2
  Early Access support for Rubinius 2.0.0-RC2 in Ruby language mode 1.8 and 1.9.
Node.js       Not yet supported on this stack.
  • 5.4.23

GA PHP requires this stack.

You can view our deployed phpinfo app for full stack details.


Web Servers

  • 1.4.24
    Used as a load balancer.
  • 1.4.7
  • 1.4.7
  • 1.2.9

Passenger is bundled into Nginx web server and is recommended for multi-app environments.
Passenger 4 requires Nginx 1.4.6. Passenger 3 works with Nginx 1.2.9.

Version 1.4.7 has been patched to address the CVE-2014-0133 vulnerability.

Version 1.2.9 has been patched to address the CVE-2013-4547 vulnerability.

  • 1.5.2


App Servers

  • 4.0.10
  • 4.0.10
  • 3.0.21

Passenger is bundled into Nginx web server and is recommended for multi-app environments.
Passenger 4 requires Nginx 1.4.6. Passenger 3 works with Nginx 1.2.9.

  • 1.6.3
  • 1.6.3
  Puma is in Early Access. Puma works with Nginx 1.2.9.
  • 4.1.1
    Recommended unless you have multiple apps in an environment. Unicorn works with Nginx 1.2.9.



  • 5.5.31
  • 5.6.14
  • 5.5.31
  If you use MySQL 5.5.x, this stack is recommended.
MySQL 5.6.x (Percona Server) is in Early Access.
  • 9.3.3
  • 9.3.3
  • 9.2.7

PostgreSQL is the default database.

  • 1.4.1
    If you use Riak, this stack is recommended.


Caches and Stores

  • 1.4.5
  • 2.4.18



  • Engine Yard Gentoo 12.11
    Gentoo stable-v4 stack. Hardened Gentoo.


Compatible Frameworks



  • All


  • 3.2.16
  • 4.0.2
  • 3.2.16
  • 3.1.12

Rails 4.0.x requires Ruby 1.9.x or greater.

Deprecating 2.3.x (requires manual patching). See the related security updates for more information. A minimum of 2.3.17 is recommended if you cannot upgrade yet to 3.1.x or 3.2.x.

Important: All 3.0 versions of Rails contain a major security vulnerability. If you are running Rails 3.0.x we urge you to upgrade to a newer release which contains the security update.



  • All



Compatible Background Job Processors

  • 2.x / 3.x


  • 1.x

The table above is not exhaustive, but covers the essential components of the Engine Yard Gentoo 12.11 technology stack and compatible components. We install other commonly used components, such as Solr, upon request; however these are not covered by Engine Yard support plans, nor does the Engine Yard SLA apply when these components are used.

IMPORTANT: The technology stack information on this page is for Engine Yard Gentoo 12.11. If you need a different tech stack, see:

For more information, see Engine Yard Technology Stack Update Policies.

If you have feedback or questions about this page, add a comment below. If you need help, submit a ticket with Engine Yard Support.