|Founded||March 4, 2006|
The Rackspace Cloud is a growing set of Cloud-related products and services billed on a utility computing basis. Offerings include web application hosting/Cloud Platform ("Cloud Sites"), Cloud Storage ("Cloud Files"), VPS ("Cloud Servers"), Cloud Load Balancers, Cloud Databases, Cloud Backup, and Cloud Monitoring. The Rackspace Cloud was one of the first commercial cloud computing services.
The Rackspace Cloud was originally launched as Mosso LLC on March 4, 2006, a wholly owned subsidiary startup billed as a utility computing offering. As it pre-dated mainstream adoption of cloud computing it was "retooled" and relaunched on February 19, 2008, adopting the tagline "Mosso: The Hosting Cloud". The "Mosso" branding (including the mosso.com domain) was then dropped on June 17, 2009 in favour of "The Rackspace Cloud" branding (including the rackspacecloud.com domain). Since then, customer contracts have been executed with Rackspace US, Inc. d/b/a The Rackspace Cloud rather than with the Mosso LLC subsidiary.
In 2011, the "Rackspace Cloud" brand merged with Rackspace.com. In 2012, Rackspace rebranded as "Rackspace, the open cloud company.".
Cloud Files 
Cloud files is a cloud hosting service that provides "unlimited online storage and CDN" for media (examples given include backups, video files, user content) on a utility computing basis (at USD 0.10/GB*month). It was originally launched as Mosso CloudFS on May 5, 2008 and is similar to Amazon Simple Storage Service. Unlimited files of up to 5 GB can be uploaded, managed via the online control panel or RESTful API and optionally served out via Akamai Technologies' Content Delivery Network.
In addition to the online control panel the service can be accessed over a RESTful API with open source client code available in C#/.NET, Python, PHP, Java and Ruby. Rackspace-owned Jungle Disk allows Cloud Files to be mounted as a local drive within supported operating systems (Linux, Mac OS X and Windows).
Redundancy is provided by replicating three full copies of data across multiple computers in multiple "zones" within the same data center, where "zones" are physically (though not geographically) separate and supplied separate power and Internet services. Uploaded files can be distributed via Akamai Technologies to "hundreds of endpoints across the world" which provides an additional layer of data redundancy.
- Use cases
Use cases considered as "well suited" include backing up or archiving data, serving images and videos (which are streamed directly to the users' browsers), serving content over content delivery networks, storing secondary static web-accessible data, developing data storage applications, storing fluctuating and/or unpredictable amounts of data and reducing costs.
There is no native operating system support for the Cloud Files API so it is not yet possible to "map" or "mount" it as a virtual drive without third-party software like JungleDisk that translates to a supported standard such as WebDAV. There are no concepts of "appending" or "locking" data within Cloud Files (which may affect some disk mirroring or backup solutions), nor support for permissions or transcoding. Data is organised into "containers" but it is not possible to create nested folders without a translation layer.
Cloud Servers 
Cloud Servers is a cloud infrastructure service that allows users to deploy "one to hundreds of cloud servers instantly" and create "advanced, high availability architectures" similar to the Amazon Elastic Compute Cloud. The "cloud servers" are virtual machines running on the Xen hypervisor for Linux-based instances, and Citrix XenServer for Windows and Linux instances. Each quad core hardware node has between 16 and 32 GB of RAM, allowing for allocations between 256 MB and 30 GB. Disk and CPU allocations scale up with memory, with disk sizes ranging from 10 GB to 620 GB. Various distributions of Linux are supported, including Arch, CentOS, Debian, Fedora, Gentoo, Red Hat Enterprise Linux and Ubuntu.
The technology behind the service was purchased in Rackspace's October 22, 2008 acquisition of Slicehost and the servers were formerly known as "slices". These are "much cheaper and generally easier to use than a traditional dedicated server", though it is still necessary to maintain the operating system and solution stack which is not required for the Cloud Sites product. This is one of the main differentiators between the two services; where Cloud Servers includes full root access and thus allows for more customisation, the Cloud Sites product is less flexible but requires less maintenance.
On December 14, 2010, The Rackspace Cloud began offering a managed service level on the Cloud Servers product, which adds additional support for the operating system and common applications as well as patching and other routine services. This additional support level does come at an increased cost, however.
RackSpace also offers Cloud Tools, which is a catalog of applications and infrastructure software built to run on the RackSpace cloud. Some of the notable applications listed are Zend, a PHP stack, Cloudkick, a cloud performance testing services, CopperEgg, a real-time cloud server and application monitoring service, Xeround, a MySQL cloud database, and MongoLab, the cloud version of the popular NoSQL database MongoDB.
The Cloud Servers API launched on July 14, 2009 under the Creative Commons Attribution 3.0 license allows clients to create, configure and control virtual servers. In addition to issuing basic management commands this "enables elastic scenarios" whereby servers are instantiated and destroyed in response to fluctuating load (one of the key characteristics of cloud computing). RightScale is among third-party providers to have announced support for this API.
Cloud Sites 
Cloud Sites is a cloud platform offering, similar to traditional web hosting only built on horizontally scalable hardware infrastructure. A fixed monthly credit card payment gives users access to the service with an allocation of compute, storage and bandwidth resources. Should this allocation be exhausted then subsequent usage is billed on a utility computing basis. It allows an "unlimited" number of sites, databases and email accounts and includes reseller options such as client billing and support. Touted as "the fastest way to put sites on the cloud", it runs Windows or Linux applications across "hundreds of servers".
- Compute cycles
The service includes up to 10,000 "compute cycles" per month which "is roughly equivalent to running a server with a 2.8 GHz modern processor for the same period of time" (with additional cycles priced at USD 0.01). This non-standard unit of measurement primarily reflects CPU processing time but also includes I/O operations so pages with many database queries will consume more "compute cycles". It can however be difficult to compare services between providers without standard units of measurement.
Cloud Sites does not support Java, Tomcat, ColdFusion, SSH, RDP, API access, Microsoft Exchange or custom server-side components at this time. It is also not possible to set up multiple top level domains to point to the same web root directory. The .NET environment dropped support for "full trust" in favour of "modified medium trust" despite having previously announced on their blog that they had been able to work directly with Microsoft to engineer a system that could accommodate Full Trust without compromising the security, scalability, and performance of other users.
Server Locations 
Cloud servers are physically located in any of four datacenters: Chicago, IL, Dallas, TX, or London, UK. Separate accounts are required to utilize servers on separate continents. Cloud Sites are available in the Dallas and Chicago datacenters only.
Control Panel 
The online control panel was custom built by and for the Rackspace Cloud service (as opposed to using control panel software like cPanel as is often the case with traditional web hosting providers).
The control panel includes management interfaces for the Cloud Sites, Cloud Servers and Cloud Files services. There was once a web based file manager, but this was removed for undisclosed reasons. It also allows users to manage multiple clients and the plans and products (e.g. databases, 24x7 support) that apply to them, with white label branding options for messaging. The clients themselves have access to a restricted version of the control panel that allows them to conduct administrative tasks such as managing mail accounts.
The control panel is also home to the billing and reporting functions and provides access to support materials including developer resources, a knowledge base, forums and live chat.
In April 2012, Rackspace announced it is in the process of implementing OpenStack Compute as the underlying technology for their Cloud Servers product. With the change will come a new control panel as well as add-on cloud services offering databases, server monitoring, block storage, and virtual networking.
See also 
- Cloud computing
- Amazon Elastic Compute Cloud
- Liquid Web
- Enlight cloud
- Zadara Storage
- HP Cloud Services
- Netcraft: New Reseller Service Offers Utility Computing for $100 a Month
- BusinessWeek: Mosso, LLC
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- Rackspace Cloud Computing - official site
- Rackspace Cloud Reviews - user reviews
- Managing Rackspace Cloud Servers—an unofficial guide to Rackspace Cloud Servers management