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<h2 id="history">History</h2> <p>In July 2010, <a href="/facts/Rackspace_Technology/4S5ehJgY">Rackspace Hosting</a> and <a href="/facts/NASA/TIMCV0yV">NASA</a> announced an open-source cloud-software initiative known as OpenStack.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a><a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> The mission statement was "to produce the ubiquitous Open Source Cloud Computing platform that will meet the needs of public and private clouds regardless of size, by being simple to implement and massively scalable".<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> </p><p>The project intended to help organizations offer cloud-computing services running on standard hardware. The community's first official release, code-named Austin, appeared three months later on 21 October 2010 (2010-10-21),<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> with plans to release regular updates of the software every few months. The early code came from NASA's <a href="/facts/Nebula_(computing_platform)/HU1Vvue6">Nebula</a> platform as well as from <a href="/facts/Rackspace_Cloud/E4UT9Akm">Rackspace's Cloud Files platform</a>. The cloud stack and open stack modules were merged and released as open source by the NASA Nebula<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> team in concert with Rackspace. </p><p>In 2011, developers of the <a href="/facts/Ubuntu/0WDd7hkb">Ubuntu</a> Linux distribution adopted OpenStack<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> with an unsupported technology preview of the OpenStack "Bexar" release for Ubuntu 11.04 "<a href="/facts/Ubuntu_natty/85JvJ2sj">Natty Narwhal</a>".<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> Ubuntu's sponsor <a href="/facts/Canonical_(company)/76WPw1uW">Canonical</a> then introduced full support for OpenStack clouds, starting with OpenStack's Cactus release. </p><p>OpenStack became available in <a href="/facts/Debian_Sid/cBd93qfJ">Debian Sid</a> from the Openstack "Cactus" release in 2011, and the first release of Debian including OpenStack was Debian 7.0 (code name "Wheezy"), including OpenStack 2012.1 (code name: "Essex").<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a><a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> </p><p>In October 2011, <a href="/facts/SUSE_S.A./qQvcGEUX">SUSE</a> announced the public preview of the industry's first fully configured OpenStack powered appliance based on the "Diablo" OpenStack release.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> In August 2012, SUSE announced its commercially supported enterprise OpenStack distribution based on the "Essex" release.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> </p> <p>In 2012, Red Hat announced a preview of their OpenStack distribution,<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> beginning with the "Essex" release. After another preview release, Red Hat introduced commercial support for OpenStack with the "Grizzly" release, in July 2013.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> </p><p>The OpenStack organization has grown rapidly and is supported by more than 540 companies.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> </p><p>In 2012 NASA withdrew from OpenStack as an active contributor, and instead made the strategic decision to use <a href="/facts/Amazon_Web_Services/UFVN2796">Amazon Web Services</a> for cloud-based services.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> In July 2013, NASA released an internal audit citing lack of technical progress and other factors as the agency's primary reason for dropping out as an active developer of the project and instead focus on the use of public clouds.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> This report is contradicted in part by remarks made by <a href="/facts/Ames_Research_Center/DQUsdLam">Ames Research Center</a> CIO, Ray O'Brien.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a> As of Nov 2021, NASA continues to utilize OpenStack in IAAS and PAAS support of the Discover supercomputer cluster. The OpenStack environment is called "Explore" and operates in the NASA Center for Climate Simulation at Goddard Space Flight Center.<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> </p> <h3>Notable deployments</h3> <p>In November 2012, The UK's <a href="/facts/Government_Digital_Service/252BmFu6">Government Digital Service</a> (GDS) launched Inside Government<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> based on the OpenNASA v2.0 Government as a Platform (GaaP) model. </p><p>In December 2013, Oracle announced it had joined OpenStack as a Sponsor and planned to bring OpenStack to Oracle Solaris, Oracle Linux, and many of its products.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> It followed by announcing Oracle OpenStack distributions for Oracle Solaris<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a><a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> and for Oracle Linux using Icehouse on 24 September 2014.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> </p><p>In May 2014, HP announced <a href="/facts/HPE_Helion/S5Qa8wFv">HP Helion</a> and released a preview of HP Helion OpenStack Community, beginning with the IceHouse release. HP has operated HP Helion Public Cloud on OpenStack since 2012.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> </p><p>At the 2014 <a href="/facts/Interop/9cSmE8TA">Interop</a> and <a href="/facts/Tech_Field_Day/anKNMfb8">Tech Field Day</a>, software-defined networking was demonstrated by <a href="/facts/Avaya/FcS0TJcg">Avaya</a> using <a href="/facts/Shortest_path_bridging/xslEBCKB">Shortest path bridging</a> and OpenStack as an automated campus, extending automation from the data center to the end device, and removing manual provisioning from service delivery.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a><a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a> </p><p>As of November 2021, NASA hosts the Explore OpenStack private cloud in support of the Discover HPC.<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a> </p><p>As of September 2022, <a href="/facts/China_Mobile/6tYxBzsr">China Mobile</a> uses OpenStack as the foundation of its 5G network. Red Hat claims that its platform is deployed on over 30 percent of production LTE networks.<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> </p><p>The OpenStack cloud at <a href="/facts/CERN/y1gwRchm">CERN</a> requires over 300,000 cores to meet the needs of the <a href="/facts/Large_Hadron_Collider/XWJCFSqT">Large Hadron Collider</a>.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> </p> <h3>Historical names</h3> <p>Several OpenStack projects changed names due to trademark issues. </p> <ul><li>Neutron was formerly known as Quantum.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a></li> <li>Sahara used to be called Savanna.<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a></li> <li>Designate was previously known as Moniker.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a></li> <li>Trove was formerly known as RedDwarf.<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a></li> <li>Zaqar was formerly known as Marconi.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a><a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a></li></ul> <h3>Release history</h3> <table><tbody><tr><th>Release name</th><th>Release date</th><th>Included Component code names<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a></th></tr><tr><td>Austin</td><td>21 October 2010<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a><a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a></td><td>Nova, Swift</td></tr><tr><td>Bexar</td><td>3 February 2011<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a></td><td>Nova, Glance, Swift</td></tr><tr><td>Cactus</td><td>15 April 2011<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a></td><td>Nova, Glance, Swift</td></tr><tr><td>Diablo</td><td>22 September 2011<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a></td><td>Nova, Glance, Swift</td></tr><tr><td>Essex</td><td>5 April 2012<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone</td></tr><tr><td>Folsom</td><td>27 September 2012<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Quantum, Cinder</td></tr><tr><td>Grizzly</td><td>4 April 2013<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Quantum, Cinder</td></tr><tr><td>Havana</td><td>17 October 2013<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer</td></tr><tr><td>Icehouse</td><td>17 April 2014<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove</td></tr><tr><td>Juno</td><td>16 October 2014<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara</td></tr><tr><td>Kilo</td><td>30 April 2015<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic</td></tr><tr><td>Liberty</td><td>16 October 2015<a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight</td></tr><tr><td>Mitaka</td><td>7 April 2016<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum</td></tr><tr><td>Newton</td><td>6 October 2016<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum, aodh, cloudkitty, congress, freezer, mistral, monasca-api, monasca-log-api, murano, panko, senlin, solum, tacker, vitrage, Watcher</td></tr><tr><td>Ocata</td><td>22 February 2017<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum, aodh, cloudkitty, congress, freezer, mistral, monasca-api, monasca-log-api, murano, panko, senlin, solum, tacker, vitrage, Watcher</td></tr><tr><td>Pike</td><td>30 August 2017<a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum, aodh, cloudkitty, congress, freezer, mistral, monasca-api, monasca-log-api, murano, panko, senlin, solum, tacker, vitrage, Watcher</td></tr><tr><td>Queens</td><td>28 February 2018<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum, aodh, cloudkitty, congress, freezer, mistral, monasca-api, monasca-log-api, murano, panko, senlin, solum, tacker, vitrage, Watcher, blazar, ceilometer-powervm, karbor, octavia, storlets, tricircle, zun</td></tr><tr><td>Rocky</td><td>30 August 2018<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum, aodh, cloudkitty, congress, freezer, mistral, monasca-api, monasca-log-api, murano, panko, senlin, solum, tacker, vitrage, Watcher, blazar, ceilometer-powervm, karbor, octavia, storlets, tricircle, zun, Cyborg, ec2-api, Masakari, Qinling (40 services)</td></tr><tr><td>Stein</td><td>10 April 2019<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum, aodh, cloudkitty, congress, freezer, mistral, monasca-api, monasca-log-api, murano, panko, senlin, solum, tacker, vitrage, Watcher, blazar, ceilometer-powervm, karbor, octavia, storlets, tricircle, zun, Cyborg, ec2-api, Masakari, Qinling, monasca-events-api, placement (44 services)</td></tr><tr><td>Train</td><td>16 October 2019<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum, aodh, cloudkitty, congress, freezer, mistral, monasca-api, monasca-log-api, murano, panko, senlin, solum, tacker, vitrage, Watcher, blazar, ceilometer-powervm, karbor, octavia, storlets, tricircle, zun, Cyborg, ec2-api, Masakari, Qinling, monasca-events-api, placement (44 services)</td></tr><tr><td>Ussuri</td><td>13 May 2020<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a></td><td>Nova, Glance, Swift, Horizon, Keystone, Neutron, Cinder, Heat, Ceilometer, Trove, Sahara, Ironic, Zaqar, Manila, Designate, Barbican, Searchlight, Magnum, aodh, cloudkitty, congress, freezer, mistral, monasca-api, murano, panko, senlin, solum, tacker, vitrage, Watcher, blazar, karbor, octavia, storlets, tricircle, zun, Cyborg, ec2-api, Masakari, Qinling, monasca-events-api, placement, adjutant (44 services)</td></tr><tr><td>Victoria</td><td>14 October 2020<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Ec2-api, Freezer, Glance, Heat, Horizon, Ironic, Karbor, Keystone, Magnum, Manila, Masakari, Mistral, Monasca-api, Monasca-events-api, Murano, Neutron, Nova, Octavia, Panko, Placement, Qinling, Sahara, Searchlight, Senlin, Solum, Storlets, Swift, Tacker, Trove, Vitrage, Watcher, Zaqar, Zun (42 services)</td></tr><tr><td>Wallaby</td><td>14 April 2021<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Ec2-api, Freezer, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Monasca-api, Monasca-events-api, Murano, Neutron, Nova, Octavia, Panko, Placement, Sahara, Senlin, Solum, Storlets, Swift, Tacker, Trove, Vitrage, Watcher, Zaqar, Zun (39 services)</td></tr><tr><td>Xena</td><td>6 October 2021<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Ec2-api, Freezer, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Monasca-api, Monasca-events-api, Murano, Neutron, Nova, Octavia, Placement, Sahara, Senlin, Solum, Storlets, Swift, Tacker, Trove, Vitrage, Watcher, Zaqar, Zun (38 services)</td></tr><tr><td>Yoga</td><td>30 March 2022<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Ec2-api, Freezer, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Monasca-api, Monasca-events-api, Murano, Neutron, Nova, Octavia, Placement, Sahara, Senlin, Solum, Storlets, Swift, Tacker, Trove, Vitrage, Watcher, Zaqar, Zun (38 services)</td></tr><tr><td>Zed</td><td>5 October 2022<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Ec2-api, Freezer, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Monasca-api, Monasca-events-api, Murano, Neutron, Nova, Octavia, Placement, Sahara, Senlin, Skyline-apiserver, Skyline-console, Solum, Storlets, Swift, Tacker, Trove, Venus, Vitrage, Watcher, Zaqar, Zun (41 services)</td></tr><tr><td>2023.1 Antelope</td><td>22 March 2023<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Ec2-api, Freezer, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Monasca-api, Monasca-events-api, Murano, Neutron, Nova, Octavia, Placement, Sahara, Senlin, Skyline-apiserver, Skyline-console, Solum, Storlets, Swift, Tacker, Trove, Venus, Vitrage, Watcher, Zaqar, Zun (41 services)</td></tr><tr><td>2023.2 Bobcat</td><td>4 October 2023<a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Ec2-api, Freezer, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Monasca-api, Monasca-events-api, Murano, Neutron, Nova, Octavia, Placement, Sahara, Senlin, Skyline-apiserver, Skyline-console, Solum, Storlets, Swift, Tacker, Trove, Venus, Vitrage, Watcher, Zaqar, Zun (41 services)</td></tr><tr><td>2024.1 Caracal</td><td>3 April 2024<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Neutron, Nova, Octavia, Placement, Skyline-apiserver, Skyline-console, Storlets, Swift, Tacker, Trove, Venus, Vitrage, Watcher, Zaqar, Zun (33 services)</td></tr><tr><td>2024.2 Dalmatian</td><td>2 October 2024<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Neutron, Nova, Octavia, Placement, Skyline-apiserver, Skyline-console, Storlets, Swift, Tacker, Trove, Venus, Vitrage, Watcher, Zaqar, Zun (33 services)</td></tr><tr><td>2025.1 Epoxy</td><td>2 April 2025<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a></td><td>Adjutant, Aodh, Barbican, Blazar, Ceilometer, Cinder, Cloudkitty, Cyborg, Designate, Freezer, Freezer-api, Glance, Heat, Horizon, Ironic, Keystone, Magnum, Manila, Masakari, Mistral, Neutron, Nova, Octavia, Placement, Skyline-apiserver, Skyline-console, Storlets, Swift, Tacker, Trove, Venus, Vitrage, Watcher, Zaqar, Zun (35 services)</td></tr></tbody></table> <h2 id="openstack-development">OpenStack development</h2> <p>The OpenStack community collaborates around a six-month, <a href="/facts/Release_early%2c_release_often/BNJe9wQN">time-based release cycle</a> with frequent development milestones.<a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a> </p><p>During the planning phase of each release, the community would gather for an OpenStack Design Summit to facilitate developer working sessions and to assemble plans.<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a> These Design Summits would coincide with the OpenStack Summit conference. </p><p>Starting with the Pike development cycle the design meetup activity has been separated out into a separate Project Teams Gathering (PTG) event.<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a> This was done to avoid the developer distractions caused by presentations and customer meetings that were happening at the OpenStack Summit and to allow the design discussions to happen ahead of the start of the next cycle. </p><p>Recent OpenStack Summits have taken place in Shanghai on 4–6 November 2019,<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a> <a href="/facts/Denver/KWUnuDSu">Denver</a> on 29 April-1 May 2019,<a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a> <a href="/facts/Berlin/pMTIRNXK">Berlin</a> on 13–19 November 2018,<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a> <a href="/facts/Vancouver/rn2AKA1n">Vancouver</a> on 21–25 May 2018,<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a> <a href="/facts/Sydney/8TegRcwB">Sydney</a> on 6–8 November 2017,<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a> <a href="/facts/Boston/exjfn6xf">Boston</a> on 8–11 May 2017,<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a> <a href="/facts/Austin%2c_Texas/xpVP4t98">Austin</a> on 25–29 April 2016,<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a> and <a href="/facts/Barcelona/8PWLdRbW">Barcelona</a> on 25–28 October 2016.<a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a> Earlier OpenStack Summits have taken place also in Tokyo in October 2015,<a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a> <a href="/facts/Vancouver/rn2AKA1n">Vancouver</a> in May 2015,<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a> and Paris in November 2014.<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a> The summit in May 2014 in <a href="/facts/Atlanta/8hPVGb78">Atlanta</a> drew 4,500 attendees – a 50% increase from the <a href="/facts/Hong_Kong_University_of_Science_and_Technology/DE5T22Ht">Hong Kong</a> summit six months earlier.<a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a><a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a> </p> <h2 id="components">Components</h2> <p>OpenStack has a modular architecture with various code names for its components.<a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a> </p> <h3>Compute (Nova)</h3> <p>Nova is the OpenStack project that provides a way to provision compute instances as virtual machines, real hardware servers (through the use of ironic), and has limited support for system containers. Nova runs as a set of daemons on top of existing Linux servers to provide that service.<a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a> <a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a> </p><p>Nova is written in <a href="/facts/Python_(programming_language)/YbuGqofa">Python</a>. It uses many external Python libraries such as Eventlet (concurrent networking library), Kombu (<a href="/facts/Advanced_Message_Queuing_Protocol/m31zHYVP">AMQP</a> messaging framework), and <a href="/facts/SQLAlchemy/CFMvc0dj">SQLAlchemy</a> (SQL toolkit and Object Relational Mapper).<a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a> Nova is designed to be <a href="/facts/Horizontal_scaling/jh7JomPa">horizontally scalable</a>. Rather than switching to larger servers, you procure more servers and simply install identically configured services.<a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a> </p><p>Due to its widespread integration into enterprise-level infrastructures, monitoring OpenStack performance in general, and Nova performance in particular, scaling became an increasingly important issue. Monitoring end-to-end performance requires tracking metrics from Nova, Keystone, Neutron, Cinder, Swift and other services, in addition to monitoring <a href="/facts/RabbitMQ/oL8BUYy0">RabbitMQ</a> which is used by OpenStack services for message passing.<a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a><a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a> All these services generate their own log files, which, especially in enterprise-level infrastructures, also should be monitored.<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a> </p> <h3>Networking (Neutron)</h3> <p>Neutron is an OpenStack project to provide "network connectivity as a service" between interface devices (e.g., vNICs) managed by other OpenStack services (e.g., nova). It implements the OpenStack Networking API.<a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a> </p><p>It manages all networking facets for the Virtual Networking Infrastructure (VNI) and the access layer aspects of the Physical Networking Infrastructure (PNI) in the OpenStack environment. OpenStack Networking enables projects to create advanced virtual network topologies which may include services such as a firewall, and a virtual private network (VPN).<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a> </p><p>Neutron allows dedicated static IP addresses or <a href="/facts/Dynamic_Host_Configuration_Protocol/lpASHnhz">DHCP</a>. It also allows <a href="/facts/Virtual_IP_address/w4dc5J4P">Floating IP</a> addresses to let traffic be dynamically rerouted. </p><p>Users can use <a href="/facts/Software-defined_networking/MJGFxyoj">software-defined networking</a> (SDN) technologies like <a href="/facts/OpenFlow/2ca9lpFG">OpenFlow</a> to support <a href="/facts/Multi-tenancy/vAxVpeUu">multi-tenancy</a> and scale. OpenStack networking can deploy and manage additional network services—such as <a href="/facts/Intrusion_detection_system/mAw24Fyo">intrusion detection systems</a> (IDS), <a href="/facts/Load_balancing_(computing)/jddk6ang">load balancing</a>, <a href="/facts/Firewall_(computing)/Et2RkJaU">firewalls</a>, and <a href="/facts/Virtual_private_network/HX1WUQ3E">virtual private networks</a> (VPN).<a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a> </p> <h3>Block storage (Cinder)</h3> <p>Cinder is the OpenStack Block Storage service for providing volumes to Nova virtual machines, Ironic bare metal hosts, containers and more. Some of the goals of Cinder are to be/have: </p> <ul><li>Component based architecture: Quickly add new behaviors</li> <li>Highly available: Scale to very serious workloads</li> <li>Fault-Tolerant: Isolated processes avoid cascading failures</li> <li>Recoverable: Failures should be easy to diagnose, debug, and rectify</li> <li>Open Standards: Be a reference implementation for a community-driven api<a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a></li></ul> <p>Cinder volumes provide persistent storage to guest virtual machines - known as instances, that are managed by OpenStack Compute software. Cinder can also be used independent of other OpenStack services as stand-alone software-defined storage. The block storage system manages the creation, replication, snapshot management, attaching and detaching of the block devices to servers.<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a> </p> <h3>Identity (Keystone)</h3> <p>Keystone is an OpenStack service that provides API client authentication, service discovery, and distributed multi-tenant authorization by implementing OpenStack's Identity API.<a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a> It is the common authentication system across the cloud operating system. Keystone can integrate with directory services like <a href="/facts/Lightweight_Directory_Access_Protocol/KgpfD8nR">LDAP</a>. It supports standard username and password credentials, token-based systems and AWS-style (i.e. <a href="/facts/Amazon_Web_Services/UFVN2796">Amazon Web Services</a>) logins. The OpenStack keystone service catalog allows API clients to dynamically discover and navigate to cloud services.<a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a> <a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a> </p> <h3>Image (Glance)</h3> <p>The Image service (glance) project provides a service where users can upload and discover data assets that are meant to be used with other services. This currently includes images and metadata definitions.<a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a> </p> <h4>Images</h4> <p>Glance image services include discovering, registering, and retrieving virtual machine (VM) images. Glance has a RESTful API that allows querying of VM image metadata as well as retrieval of the actual image. VM images made available through Glance can be stored in a variety of locations from simple filesystems to object-storage systems like the OpenStack Swift project.<a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a> </p> <h4>Metadata Definitions</h4> <p>Glance hosts a metadefs catalog. This provides the OpenStack community with a way to programmatically determine various metadata key names and valid values that can be applied to OpenStack resources.<a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a> </p> <h3>Object storage (Swift)</h3> <p>Swift is a distributed, eventually consistent object/blob store. The OpenStack Object Store project, known as Swift, offers cloud storage software so that you can store and retrieve lots of data with a simple API. It's built for scale and optimized for durability, availability, and concurrency across the entire data set. Swift is ideal for storing unstructured data that can grow without bound.<a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a> </p><p>In August 2009, <a href="/facts/Rackspace/4S5ehJgY">Rackspace</a> started the development of the precursor to OpenStack Object Storage, as a complete replacement for the <i>Cloud Files</i> product. The initial development team consisted of nine developers.<a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a> SwiftStack, an object storage software company, is currently the leading developer for Swift with significant contributions from <a href="/facts/Intel/SMF0gJJX">Intel</a>, <a href="/facts/Red_Hat/5rhmBLBa">Red Hat</a>, <a href="/facts/Nippon_Telegraph_and_Telephone/a3gI457X">NTT</a>, <a href="/facts/HP_Inc./68EHIDIa">HP</a>, <a href="/facts/IBM/QszA7nwd">IBM</a>, and more.<a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a> </p> <h3>Dashboard (Horizon)</h3> <p>Horizon is the canonical implementation of OpenStack's Dashboard, which provides a web based user interface to OpenStack services including Nova, Swift, Keystone, etc.<a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a> Horizon ships with three central dashboards, a "User Dashboard", a "System Dashboard", and a "Settings" dashboard. Between these three they cover the core OpenStack applications and deliver on Core Support. The Horizon application also ships with a set of API abstractions for the core OpenStack projects in order to provide a consistent, stable set of reusable methods for developers. Using these abstractions, developers working on Horizon don't need to be intimately familiar with the APIs of each OpenStack project.<a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a> </p> <h3>Orchestration (Heat)</h3> <p>Heat is a service to <a href="/facts/Orchestration_(computing)/0kM890C9">orchestrate</a> multiple composite cloud applications using templates, through both an OpenStack-native REST API and a CloudFormation-compatible Query API.<a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a> </p> <h3>Workflow (Mistral)</h3> <p>Mistral is a service that manages workflows. User typically writes a workflow using workflow language based on YAML and uploads the workflow definition to Mistral via its REST API. Then user can start this workflow manually via the same API or configure a trigger to start the workflow on some event.<a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a> </p> <h3>Telemetry (Ceilometer)</h3> <p>OpenStack Telemetry (Ceilometer) provides a Single Point Of Contact for billing systems, providing all the counters they need to establish customer billing, across all current and future OpenStack components. The delivery of counters is traceable and auditable, the counters must be easily extensible to support new projects, and agents doing data collection should be independent of the overall system. </p> <h3>Database (Trove)</h3> <p>Trove is a database-as-a-service provisioning <a href="/facts/Relational_database/pEKGmJLy">relational</a> and a non-relational <a href="/facts/Database/VYcpkevb">database</a> engine.<a class="footnote-ref" id="fnref:116" href="#fn:116"><sup>116</sup></a> </p> <h3>Elastic map reduce (Sahara)</h3> <p>Sahara is a component to easily and rapidly provision <a href="/facts/Apache_Hadoop/oUS1G2R7">Hadoop</a> clusters. Users will specify several parameters like the Hadoop version number, the cluster topology type, node flavor details (defining disk space, CPU and RAM settings), and others. After a user provides all of the parameters, Sahara deploys the cluster in a few minutes. Sahara also provides means to scale a preexisting Hadoop cluster by adding and removing worker nodes on demand.<a class="footnote-ref" id="fnref:117" href="#fn:117"><sup>117</sup></a><a class="footnote-ref" id="fnref:118" href="#fn:118"><sup>118</sup></a> </p> <h3>Bare metal (Ironic)</h3> <p>Ironic is an OpenStack project that provisions bare metal machines instead of virtual machines. It was initially forked from the Nova Baremetal driver and has evolved into a separate project. It is best thought of as a bare-metal hypervisor API and a set of plugins that interact with the bare-metal machines managed by Ironic. By default, it will use <a href="/facts/Preboot_Execution_Environment/k6uV4fwT">PXE</a> and <a href="/facts/Intelligent_Platform_Management_Interface/hrcePUSL">IPMI</a> or <a href="/facts/Redfish_(specification)/NDhYxjg3">Redfish</a><a class="footnote-ref" id="fnref:119" href="#fn:119"><sup>119</sup></a> in concert to provision and manage physical machines, but Ironic supports and can be extended with vendor-specific plugins to implement additional functionality.<a class="footnote-ref" id="fnref:120" href="#fn:120"><sup>120</sup></a><a class="footnote-ref" id="fnref:121" href="#fn:121"><sup>121</sup></a> </p><p>Since the inception of Ironic, it has spawned several sub-projects<a class="footnote-ref" id="fnref:122" href="#fn:122"><sup>122</sup></a> to help support additional use cases and capabilities. Some of the more commonly leveraged of these projects include Ironic-Inspector, Bifrost, Sushy, and networking-generic-switch. Ironic-inspector supplies hardware information collection and hardware discovery.<a class="footnote-ref" id="fnref:123" href="#fn:123"><sup>123</sup></a> Bifrost focuses on the use case of operating without other OpenStack components,<a class="footnote-ref" id="fnref:124" href="#fn:124"><sup>124</sup></a> and is highlighted on the website ironicbaremetal.org. Sushy is a lightweight Redfish API client library.<a class="footnote-ref" id="fnref:125" href="#fn:125"><sup>125</sup></a> Networking-generic-switch is a plugin which supports managing switchport configuration for bare metal machines.<a class="footnote-ref" id="fnref:126" href="#fn:126"><sup>126</sup></a> </p> <h3>Messaging (Zaqar)</h3> <p>Zaqar is a multi-tenant cloud messaging service for Web developers. The service features a fully RESTful API, which developers can use to send messages between various components of their SaaS and mobile applications by using a variety of communication patterns. Underlying this API is an efficient messaging engine designed with scalability and security in mind. Other OpenStack components can integrate with Zaqar to surface events to end users and to communicate with guest agents that run in the "over-cloud" layer. </p> <h3>Shared file system (Manila)</h3> <p>OpenStack Shared File System (Manila) provides an open API to manage shares in a vendor agnostic framework. Standard primitives include the ability to create, delete, and give/deny access to a share and can be used standalone or in a variety of different network environments. Commercial storage appliances from EMC, NetApp, HP, IBM, Oracle, Quobyte, INFINIDAT and Hitachi Data Systems are supported as well as filesystem technologies such as Red Hat <a href="/facts/GlusterFS/sVzz6ERY">GlusterFS</a><a class="footnote-ref" id="fnref:127" href="#fn:127"><sup>127</sup></a> or <a href="/facts/Ceph_(software)/EU6zMFbx">Ceph</a>. </p> <h3>DNS (Designate)</h3> <p>Designate is a multi-tenant REST API for managing DNS. This component provides DNS as a Service and is compatible with many backend technologies, including PowerDNS and BIND. It doesn't provide a DNS service as such as its purpose is to interface with existing DNS servers to manage DNS zones on a per tenant basis.<a class="footnote-ref" id="fnref:128" href="#fn:128"><sup>128</sup></a> </p> <h3>Search (Searchlight)</h3> <p>The project is no longer actively maintained. </p><p>Searchlight provides advanced and consistent search capabilities across various OpenStack cloud services. It accomplishes this by offloading user search queries from other OpenStack API servers by indexing their data into <a href="/facts/Elasticsearch/aF9WuCFy">Elasticsearch</a>.<a class="footnote-ref" id="fnref:129" href="#fn:129"><sup>129</sup></a> Searchlight is being integrated into Horizon<a class="footnote-ref" id="fnref:130" href="#fn:130"><sup>130</sup></a> and also provides a <a href="/facts/Command-line_interface/R9JpGmXQ">Command-line interface</a>.<a class="footnote-ref" id="fnref:131" href="#fn:131"><sup>131</sup></a> </p> <h3>Key manager (Barbican)</h3> <p>Barbican is a REST API designed for the secure storage, provisioning and management of secrets. It is aimed at being useful for all environments, including large ephemeral Clouds.<a class="footnote-ref" id="fnref:132" href="#fn:132"><sup>132</sup></a> </p> <h3>Container orchestration (Magnum)</h3> <p>Magnum is an OpenStack API service developed by the OpenStack Containers Team making container orchestration engines such as Docker Swarm, Kubernetes, and Apache Mesos available as first class resources in OpenStack. Magnum uses Heat to orchestrate an OS image which contains Docker and Kubernetes and runs that image in either virtual machines or bare metal in a cluster configuration.<a class="footnote-ref" id="fnref:133" href="#fn:133"><sup>133</sup></a> </p> <h3>Root Cause Analysis (Vitrage)</h3> <p>Vitrage is the OpenStack RCA (Root Cause Analysis) service for organizing, analyzing and expanding OpenStack alarms & events, yielding insights regarding the root cause of problems and deducing their existence before they are directly detected.<a class="footnote-ref" id="fnref:134" href="#fn:134"><sup>134</sup></a> </p> <h3>Rule-based alarm actions (Aodh)</h3> <p>This alarming service enables the ability to trigger actions based on defined rules against metric or event data collected by Ceilometer or Gnocchi.<a class="footnote-ref" id="fnref:135" href="#fn:135"><sup>135</sup></a> </p> <h2 id="compatibility-with-other-cloud-apis">Compatibility with other cloud APIs</h2> <p>OpenStack does not strive for compatibility with other clouds' APIs.<a class="footnote-ref" id="fnref:136" href="#fn:136"><sup>136</sup></a> However, there is some amount of compatibility driven by various members of the OpenStack community for whom such things are important. </p> <ul><li>The EC2 API project aims to provide compatibility with <a href="/facts/Amazon_Elastic_Compute_Cloud/2EMwnvlS">Amazon EC2</a><a class="footnote-ref" id="fnref:137" href="#fn:137"><sup>137</sup></a></li> <li>The GCE API project aims to provide compatibility with <a href="/facts/Google_Compute_Engine/tJDHgQke">Google Compute Engine</a><a class="footnote-ref" id="fnref:138" href="#fn:138"><sup>138</sup></a></li></ul> <h2 id="governance">Governance</h2> <p>OpenStack is governed by the OpenInfra foundation and its board of directors. The board of directors is made up of Platinum sponsors, members of the Gold sponsors and members elected by the Foundation individual members.<a class="footnote-ref" id="fnref:139" href="#fn:139"><sup>139</sup></a> The OpenStack Technical Committee is the governing body of the OpenStack open source project. It is an elected group that represents the contributors to the project, and has oversight on all technical matters. This includes developers, operators and end users of the software. </p> <h2 id="appliances">Appliances</h2> <p>An OpenStack Appliance<a class="footnote-ref" id="fnref:140" href="#fn:140"><sup>140</sup></a> is the name given to software that can support the OpenStack <a href="/facts/Cloud_computing/guhg0FGV">cloud computing platform</a> on either physical devices such as <a href="/facts/Server_(computing)/dEaYFD7r">servers</a> or <a href="/facts/Virtual_machine/BLevU3sx">virtual machines</a> or a combination of the two. Typically a <a href="/facts/Software_appliance/NDgUInv5">software appliance</a><a class="footnote-ref" id="fnref:141" href="#fn:141"><sup>141</sup></a> is a set of software capabilities that can function without an operating system. Thus, they must contain enough of the essential underlying operating system components to work. Therefore, a strict definition might be: an application that is designed to offer OpenStack capability without the necessity of an underlying operating system. However, applying this strict definition may not be helpful, as there is not really a clear distinction between an appliance and a <a href="/facts/Linux_distribution/0vVl4N4f">distribution</a>.<a class="footnote-ref" id="fnref:142" href="#fn:142"><sup>142</sup></a> It could be argued that the term appliance is something of a misnomer because OpenStack itself is referred to as a cloud operating system<a class="footnote-ref" id="fnref:143" href="#fn:143"><sup>143</sup></a> so using the term OpenStack appliance could be a misnomer if one is being pedantic. </p><p>If we look at the range of Appliances and Distributions one could make the distinction that distributions are those toolsets which attempt to provide a wide coverage of the OpenStack project scope, whereas an Appliance will have a more narrow focus, concentrating on fewer projects. Vendors have been heavily involved in OpenStack since its inception, and have since developed and are marketing a wide range of appliances, applications and distributions. </p> <h2 id="vendors">Vendors</h2> <p>A large number of vendors offer OpenStack solutions, meaning that an organization wishing to deploy the technology has a complex task in selecting the vendor offer that best matches its business requirements.<a class="footnote-ref" id="fnref:144" href="#fn:144"><sup>144</sup></a> Barb Darrow offered this overview in Fortune on 27 May 2015,<a class="footnote-ref" id="fnref:145" href="#fn:145"><sup>145</sup></a> pointing out that there may be some consolidation in the market that will clarify those decisions. </p><p>There are other aspects that users need to consider, for example, the real costs involved.<a class="footnote-ref" id="fnref:146" href="#fn:146"><sup>146</sup></a> Some vendors will make an offer which encompasses most of the OpenStack projects; others will only offer certain components. Other considerations include the extent of proprietary code used to manage a lack of maturity in an OpenStack component, and to what extent that encourages vendor lock-in.<a class="footnote-ref" id="fnref:147" href="#fn:147"><sup>147</sup></a><a class="footnote-ref" id="fnref:148" href="#fn:148"><sup>148</sup></a> </p><p>The most authoritative information on vendor products is at the Open Infrastructure Foundation website.<a class="footnote-ref" id="fnref:149" href="#fn:149"><sup>149</sup></a> </p> <h2 id="challenges-to-implementation">Challenges to implementation</h2> <p>OpenStack is a complex entity, and adopters face a range of challenges when trying to implement OpenStack in an organisation. For many organisations trying to implement their own projects, a key issue is the lack of skills available.<a class="footnote-ref" id="fnref:150" href="#fn:150"><sup>150</sup></a> In an article on <i>The New Stack</i>, Atul Jha identifies five challenges any organization wishing to deploy OpenStack will face.<a class="footnote-ref" id="fnref:151" href="#fn:151"><sup>151</sup></a> </p> <h3>Installation challenges</h3> <p>OpenStack is a suite of projects rather than a single product, and because each of the various applications needs to be configured to suit the user's requirements, installation is complex and requires a range of complementary skill-sets<a class="footnote-ref" id="fnref:152" href="#fn:152"><sup>152</sup></a> for an optimum set-up. One obvious solution would be to take a complete vendor supplied package containing hardware and software, although due diligence is essential.<a class="footnote-ref" id="fnref:153" href="#fn:153"><sup>153</sup></a> </p> <h3>Documentation</h3> <p>This is more a function of the nature of documentation with open source products than OpenStack per se, but with more than 25 projects, managing document quality is always going to be challenging.<a class="footnote-ref" id="fnref:154" href="#fn:154"><sup>154</sup></a> </p> <h3>Upgrading OpenStack</h3> <p>One of the main objectives of using cloud type infrastructure is to offer users not only high reliability but also high availability,<a class="footnote-ref" id="fnref:155" href="#fn:155"><sup>155</sup></a> something that public cloud suppliers will offer in <a href="/facts/Service-level_agreement/lR2Gv0gv">service-level agreements</a>.<a class="footnote-ref" id="fnref:156" href="#fn:156"><sup>156</sup></a> </p><p>Due to OpenStack's multi-project development approach, the complexity involved in synchronising the different projects during an upgrade may mean that downtime is unavoidable<i>.</i><a class="footnote-ref" id="fnref:157" href="#fn:157"><sup>157</sup></a> </p> <h3>Long term support</h3> <p>It's quite common for a business to keep using an earlier release of software for some time after it has been upgraded. However, there is little incentive for developers in an open source project to provide support for superseded code. In addition, OpenStack itself has formally discontinued support for some old releases.<a class="footnote-ref" id="fnref:158" href="#fn:158"><sup>158</sup></a> </p><p>Given the above challenges the most appropriate route for an organization wishing to implement OpenStack would be to go with a vendor, and source an OpenStack appliance or distribution. </p> <h2 id="deployment-models">Deployment models</h2> <p>As the OpenStack project has matured, vendors have pioneered multiple ways for customers to deploy OpenStack: </p> OpenStack-based Public Cloud A vendor provides a public cloud computing system based on the OpenStack project. On-premises distribution In this model, a customer downloads and installs an OpenStack distribution in their internal network. See Distributions. Hosted OpenStack Private Cloud A vendor hosts an OpenStack-based private cloud: including the underlying hardware and the OpenStack software. OpenStack-as-a-Service A vendor hosts OpenStack management software (without any hardware) as a service. Customers sign up for the service and pair it with their internal servers, storage and networks to get a fully operational private cloud. Appliance based OpenStack Nebula was a vendor that sold appliances that could be plugged into a network which spawned an OpenStack deployment. <h2 id="distributions">Distributions</h2> <ul><li><a href="/facts/Bright_Computing/1ESJUEfj">Bright Computing</a><a class="footnote-ref" id="fnref:159" href="#fn:159"><sup>159</sup></a></li> <li><a href="/facts/Canonical_(company)/76WPw1uW">Canonical</a> (Ubuntu)</li> <li><a href="/facts/Debian/cBd93qfJ">Debian</a><a class="footnote-ref" id="fnref:160" href="#fn:160"><sup>160</sup></a><a class="footnote-ref" id="fnref:161" href="#fn:161"><sup>161</sup></a><a class="footnote-ref" id="fnref:162" href="#fn:162"><sup>162</sup></a></li> <li><a href="/facts/Hewlett_Packard_Enterprise/d9NbClDt">HPE</a> (which was spin-merged to Micro Focus/Suse)</li> <li><a href="/facts/IBM/QszA7nwd">IBM</a></li> <li><a href="/facts/Mirantis/DokGboNe">Mirantis</a></li> <li><a href="/facts/Oracle_Corporation/0z14FygH">Oracle</a> OpenStack for Oracle Linux, or O3L<a class="footnote-ref" id="fnref:163" href="#fn:163"><sup>163</sup></a></li> <li>Oracle OpenStack for Oracle Solaris</li> <li><a href="/facts/Red_Hat/5rhmBLBa">Red Hat</a></li> <li><a href="/facts/Stratoscale/aHbhPTxJ">Stratoscale</a></li> <li><a href="/facts/VMware/lKHGULx3">VMware Integrated OpenStack (VIO)</a><a class="footnote-ref" id="fnref:164" href="#fn:164"><sup>164</sup></a></li></ul> <h2 id="see-also">See also</h2> <ul> <li>Free and open-source software portal</li></ul> <ul><li><a href="/facts/Cloud_Foundry/ypUrJzuC">Cloud Foundry</a></li> <li><a href="/facts/Cloud-computing_comparison/fBvbzxwz">Cloud-computing comparison</a></li> <li><a href="/facts/OpenShift/ehloJnBX">OpenShift</a></li> <li><a href="/facts/Private_cloud_computing_infrastructure/qg8cxTGD">Private cloud computing infrastructure</a></li></ul> <h2 id="external-links">External links</h2> Wikimedia Commons has media related to OpenStack. <ul><li><a href="https://www.openstack.org/">Official website</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"OpenStack Open Source Cloud Computing Software". 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