Apache CloudStack

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CloudStack Logo.png
Original author(s) Cloud.com, Citrix
Developer(s) Apache Software Foundation
Stable release 4.4.3 / January 9, 2015; 3 months ago (2015-01-09)
Written in Java (primarily)
Operating system Cross-platform for management servers, GNU/Linux for hosts, Windows, GNU/Linux, and BSD for guests (depending on hypervisor).[1]
Platform Java
Type Cloud computing
License Apache License 2
Website cloudstack.apache.org

CloudStack is an open source cloud computing software for creating, managing, and deploying infrastructure cloud services. It uses existing hypervisors such as KVM, VMware vSphere, and XenServer/XCP for virtualization. In addition to its own API, CloudStack also supports the Amazon Web Services (AWS) API[2] and the Open Cloud Computing Interface from the Open Grid Forum.[3]


CloudStack was originally developed by Cloud.com, formerly known as VMOps.[4] In May 2010, Cloud.com released most of CloudStack as free software under the GNU General Public License, version 3 (GPLv3). They kept about 5% proprietary.[5] Cloud.com and Citrix both supported OpenStack, another Apache-licensed cloud computing program, at its announcement in July 2010.[6]

Citrix purchased Cloud.com on July 12, 2011, for approximately $200 million.[7][8] In August 2011, Citrix released the remaining code under GPLv3 and continued moving towards more open processes.[5] In February 2012, Citrix released CloudStack 3.0. Among other features, this added support for Swift, OpenStack's S3-like object storage solution.[9] In April 2012, Citrix donated CloudStack to the Apache Software Foundation (ASF), where it was accepted into the Apache Incubator; Citrix changed the license to the Apache License version 2. As part of this change, Citrix also ceased their involvement in OpenStack.[10] On November 6, 2012, CloudStack 4.0.0-incubating was announced,[11] the first stable release after joining ASF. On March 20, 2013, CloudStack graduated from Apache Incubator and became a Top-Level Project (TLP) of ASF.[12] The first stable (maintenance) release after graduation is CloudStack 4.0.2.[13]

Key features[1][edit]

  • Built-in high-availability for hosts and VMs
  • AJAX web GUI for management
  • AWS API compatibility
  • Hypervisor agnostic
  • Snapshot management
  • Usage metering
  • Network management (VLAN's, security groups)
  • Virtual routers, firewalls, load balancers
  • Multi-role support

Deployment Architecture[edit]

The minimum production installation consists of one machine running the CloudStack Management Server and another machine to act as the cloud infrastructure (in this case, a very simple infrastructure consisting of one host running hypervisor software). In its smallest deployment, a single machine can act as both the Management Server and the hypervisor host (using the KVM hypervisor).[14]

Multiple management servers can be configured for redundancy and load balancing, all pointing to a common MySQL database.


In July 2012 it was reported that Datapipe launched the largest international public cloud to be built on CloudStack, which included 6 data centers in the USA, Britain, and Asia.[15]

Among the notable users:

User Groups[edit]

See also[edit]


  1. ^ a b "Features". CloudStack. Retrieved May 17, 2013. 
  2. ^ "Supported AWS API Calls". Retrieved May 17, 2013. 
  3. ^ "OCCI Interface to CloudStack". Retrieved Feb 26, 2014. 
  4. ^ "Cloud.com takes on virty infrastructure". The Channel. May 4, 2010. Retrieved May 27, 2012. 
  5. ^ a b "CloudStack Process Changes: Working the Apache Way". CloudStack. April 17, 2012. Retrieved May 27, 2012. 
  6. ^ "NASA and Rackspace open source cloud fluffer". The Register. July 19, 2010. Retrieved May 27, 2012. 
  7. ^ "Citrix Makes a Run at the Cloud". BusinessWeek. July 14, 2011. Retrieved May 27, 2012. 
  8. ^ "Citrix Buys Cloud.com for More Than $200 Million; Redpoint Is on a Roll". TechCrunch. July 12, 2011. Retrieved May 27, 2012. 
  9. ^ "Citrix CloudStack 3 Brings the Power of Amazon-Style Clouds to Customers of All Sizes". Citrix. February 13, 2012. Retrieved May 27, 2012. 
  10. ^ "Citrix Splits With OpenStack, Takes Cloud to Apache". Wired. April 4, 2012. Retrieved May 27, 2012. 
  11. ^ "Apache CloudStack 4.0.0-incubating Released". Apache Software Foundation. November 6, 2012. Retrieved May 17, 2013. 
  12. ^ "CloudStack Project Incubation Status". Apache Software Foundation. March 20, 2013. Retrieved May 17, 2013. 
  13. ^ "Apache CloudStack 4.0.2 Released". Apache Software Foundation. April 24, 2013. Retrieved May 17, 2013. 
  14. ^ "Deployment Architecture Overview". CloudStack. Retrieved May 17, 2013. 
  15. ^ "Datapipe launches largest CloudStack deployment". NetworkWorld. July 17, 2012. Retrieved Jan 31, 2013. 
  16. ^ "Are these people really all using CloudStack?". 

External links[edit]