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Docker (software)
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<h2 id="background">Background</h2> <p>Containers are isolated from one another and bundle their own software, <a href="/facts/Library_(computing)/xRzL3P7q">libraries</a> and configuration files; they can communicate with each other through well-defined channels.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> Because all of the containers share the services of a single <a href="/facts/Kernel_(operating_system)/uEj4U3Rz">operating system kernel</a>, they use fewer resources than <a href="/facts/Virtual_machine/BLevU3sx">virtual machines</a>.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p> <h3>Operation</h3> <p>Docker can package an application and its dependencies in a virtual container that can run on any <a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, or <a href="/facts/MacOS/Y93vVpTm">macOS</a> computer. This enables the application to run in a variety of locations, such as <a href="/facts/On-premises_software/yGJvghTK">on-premises</a>, in <a href="/facts/Public_cloud/guhg0FGV">public</a> <i>(see <a href="/facts/Decentralized_computing/oTp3d3XL">decentralized computing</a>, <a href="/facts/Distributed_computing/o5nyhqTF">distributed computing</a>, and <a href="/facts/Cloud_computing/guhg0FGV">cloud computing</a>)</i> or <a href="/facts/Private_cloud/guhg0FGV">private cloud</a>.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> When running on Linux, Docker uses the resource isolation features of the <a href="/facts/Linux_kernel/dlkduHuA">Linux kernel</a> (such as <a href="/facts/Cgroups/seJrzYuQ">cgroups</a> and kernel <a href="/facts/Linux_namespaces/1ljlDGT0">namespaces</a>) and a <a href="/facts/Union_mount/ddBxp6zY">union-capable file system</a> (such as <a href="/facts/OverlayFS/7UTaAB7P">OverlayFS</a>)<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> to allow containers to run within a single Linux instance, avoiding the overhead of starting and maintaining <a href="/facts/Virtual_machine/BLevU3sx">virtual machines</a>. Docker on macOS uses a Linux <a href="/facts/Virtual_machine/BLevU3sx">virtual machine</a> to run the containers.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> </p><p>Because Docker containers are <a href="/facts/Light-weight_Linux_distribution/n6LUYxqK">lightweight</a>, a single server or virtual machine can run several containers simultaneously.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> A 2018 analysis found that a typical Docker use case involves running eight containers per host, and that a quarter of analyzed organizations run 18 or more per host.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> It can also be installed on a single board computer like the <a href="/facts/Raspberry_Pi/Ie6Lx9n5">Raspberry Pi</a>.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> </p><p>The Linux kernel's support for namespaces mostly<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> isolates an application's view of the operating environment, including process trees, network, user IDs and mounted file systems, while the kernel's cgroups provide resource limiting for memory and CPU.<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> Since version 0.9, Docker includes its own component (called libcontainer) to use virtualization facilities provided directly by the Linux kernel, in addition to using abstracted virtualization interfaces via <a href="/facts/Libvirt/9YwAkRsr">libvirt</a>, <a href="/facts/LXC/gmfT31xS">LXC</a> and <a href="/facts/Systemd-nspawn/zls5HoVh">systemd-nspawn</a>.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a><a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a><a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a><a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> </p><p>Docker implements a high-level <a href="/facts/API/GMlN4vUr">API</a> to provide lightweight containers that run processes in isolation.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> </p> <h2 id="licensing-model">Licensing model</h2> <ul><li>The Docker Engine is licensed under the <a href="/facts/Apache_License_2.0/5AeIjas8">Apache License 2.0</a>. Docker Desktop distributes some components that are licensed under the <a href="/facts/GNU_General_Public_License/S75KhLSX">GNU General Public License</a>. Docker Desktop is not free for large enterprises.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a></li> <li>The Dockerfile files can be licensed under an open-source license themselves. The scope of such a license statement is only the Dockerfile and not the container image.</li></ul> <h2 id="components">Components</h2> <p>The Docker software as a service offering consists of three components: </p> <ul><li>Software: The Docker <a href="/facts/Daemon_(computing)/bzuEVGGX">daemon</a>, called dockerd, is a persistent process that manages Docker containers and handles container objects. The daemon listens for requests sent via the Docker Engine API.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a><a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> The Docker client program, called docker, provides a <a href="/facts/Command-line_interface/R9JpGmXQ">command-line interface</a> (CLI) that allows users to interact with Docker daemons.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a><a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a></li> <li>Objects: Docker objects are various entities used to assemble an application in Docker. The main classes of Docker objects are images, containers, and services.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> <ul><li>A Docker container is a standardized, encapsulated environment that runs applications.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> A container is managed using the Docker API or <a href="/facts/Command-line_interface/R9JpGmXQ">CLI</a>.<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a></li> <li>A Docker image is a read-only template used to build containers. Images are used to store and ship applications.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a></li> <li>A Docker service allows containers to be scaled across multiple Docker daemons. The result is known as a <i>swarm</i>, a set of cooperating daemons that communicate through the Docker API.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a></li></ul></li> <li>Registries: A Docker registry is a repository for Docker images. Docker clients connect to registries to download ("pull") images for use or upload ("push") images that they have built. Registries can be public or private. The main public registry is Docker Hub. Docker Hub is the default registry where Docker looks for images.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a><a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a> Docker registries also allow the creation of notifications based on events.<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a></li></ul> <h3>Dockerfile (example)</h3> <p>A Dockerfile is a text file that commonly specifies several aspects of a Docker container: the <a href="/facts/Linux_distribution/0vVl4N4f">Linux distribution</a>, installation commands for the programming language runtime environment and application source code. </p><p> An example of a Dockerfile:<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a></p>ARG CODE_VERSION=latest FROM ubuntu:${CODE_VERSION} COPY ./examplefile.txt /examplefile.txt ENV MY_ENV_VARIABLE="example_value" RUN apt-get update # Mount a directory from the Docker volume # Note: This is usually specified in the 'docker run' command. VOLUME ["/myvolume"] # Expose a port (22 for SSH) EXPOSE 22 <h3>Tools</h3> <ul><li>Docker Compose is a tool for defining and running multi-container Docker applications.<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> It uses <a href="/facts/YAML/mAY10H2Y">YAML</a> files to configure the application's services and performs the creation and start-up process of all the containers with a single command. The docker compose CLI utility allows users to run commands on multiple containers at once; for example, building images, <a href="/facts/Scalability/jh7JomPa">scaling</a> containers, running containers that were stopped, and more.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> Commands related to image manipulation, or user-interactive options, are not relevant in Docker Compose because they address one container.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a> The docker-compose.yml file is used to define an application's services and includes various configuration options. For example, the build option defines configuration options such as the Dockerfile path, the command option allows one to override default Docker commands, and more.<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> The first public beta version of Docker Compose (version 0.0.1) was released on December 21, 2013.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a> The first production-ready version (1.0) was made available on October 16, 2014.<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a></li> <li>Docker Swarm provides native <a href="/facts/Computer_cluster/mT7S1BcX">clustering</a> functionality for Docker containers, which turns a group of Docker engines into a single virtual Docker engine.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a> In Docker 1.12 and higher, Swarm mode is integrated with Docker Engine.<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> The docker swarm CLI<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> utility allows users to run Swarm containers, create discovery tokens, list nodes in the cluster, and more.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> The docker node CLI utility allows users to run various commands to manage nodes in a swarm, for example, listing the nodes in a swarm, updating nodes, and removing nodes from the swarm.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a> Docker manages swarms using the <a href="/facts/Raft_(computer_science)/ppsFb4Xq">Raft</a> <a href="/facts/Consensus_(computer_science)/rC0eH88V">consensus</a> algorithm. According to Raft, for an update to be performed, the majority of Swarm nodes need to agree on the update.<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a><a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a> In addition to the docker swarm CLI, docker stack is a tool designed to manage Swarm services with greater flexibility. It can use a configuration file very similar to a docker-compose.yml, with a few nuances. Using docker stack instead of docker compose offers several advantages, such as the ability to manage a Swarm cluster across multiple machines or the capability to work with docker secret combined with docker context, a feature that allows executing Docker commands on a remote host, enabling remote container management.</li></ul> <ul><li>Docker Volume facilitates the independent persistence of data, allowing data to remain even after the container is deleted or re-created.<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a></li></ul> <h2 id="history">History</h2> <p>dotCloud Inc. was founded by Kamel Founadi, Solomon Hykes, and Sebastien Pahl<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> during the <a href="/facts/Y_Combinator/LR8YYHFs">Y Combinator</a> Summer 2010 startup incubator group and launched in 2011, and renamed to Docker Inc in 2013.<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> The startup was also one of the 12 startups in <i>Founder's Den</i> first cohort.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> Hykes started the Docker project in France as an internal project within <a href="/facts/DotCloud/BsDC457n">dotCloud</a>, a <a href="/facts/Platform_as_a_service/EDX8mcw4">platform-as-a-service</a> company.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a> </p><p>Docker debuted to the public in <a href="/facts/Santa_Clara%2c_California/lkQTssCF">Santa Clara</a> at <a href="/facts/PyCon/W95qjlLp">PyCon</a> in 2013.<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> It was released as <a href="/facts/Open-source/7X9rCdz4">open-source</a> in March 2013.<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> At the time, it used <a href="/facts/LXC/gmfT31xS">LXC</a> as its default execution environment. One year later, with the release of version 0.9, Docker replaced LXC with its own component, <i>libcontainer</i>, which was written in the <a href="/facts/Go_(programming_language)/oWlsmAFJ">Go</a> programming language.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a><a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a> </p><p>In 2017, Docker created the Moby project [d] for open research and development.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a> </p> <h3>Adoption</h3> <ul><li>September 19, 2013: <a href="/facts/Red_Hat/5rhmBLBa">Red Hat</a> and Docker announced a collaboration around <a href="/facts/Fedora_(operating_system)/LJ2ocge5">Fedora</a>, <a href="/facts/Red_Hat_Enterprise_Linux/6Cekx2ed">Red Hat Enterprise Linux</a> (RHEL), and <a href="/facts/OpenShift/ehloJnBX">OpenShift</a>.<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a></li> <li>October 15, 2014: <a href="/facts/Microsoft/nGIDDXdx">Microsoft</a> announced the integration of the Docker engine into <a href="/facts/Windows_Server/5t7XxyUV">Windows Server</a>, as well as native support for the Docker client role in Windows.<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a><a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a></li> <li>November 2014: Docker container services were announced for the <a href="/facts/Amazon_Elastic_Compute_Cloud/2EMwnvlS">Amazon Elastic Compute Cloud</a> (EC2).<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a></li> <li>November 10, 2014: Docker announced a partnership with <a href="/facts/Stratoscale/aHbhPTxJ">Stratoscale</a>.<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a></li> <li>December 4, 2014: <a href="/facts/IBM/QszA7nwd">IBM</a> announced a strategic partnership with Docker that enables Docker to integrate more closely with the IBM Cloud.<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a></li> <li>June 22, 2015: Docker and several other companies announced that they were working on a new vendor and operating-system-independent standard for software containers.<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a><a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a></li> <li>December 2015: <a href="/facts/Oracle_Cloud/3VfYGGIB">Oracle Cloud</a> added Docker container support after acquiring <a href="/facts/StackEngine/eFSJrLNl">StackEngine</a>, a Docker container startup.<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a></li> <li>April 2016: Windocks, an <a href="/facts/Independent_software_vendor/Vkt3oRBJ">independent software vendor</a> released a port of Docker's open source project to Windows, supporting Windows Server 2012 R2 and Server 2016, with all editions of SQL Server 2008 onward.<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a></li> <li>May 2016: analysis showed the following organizations as main contributors to Docker: The Docker team, <a href="/facts/Cisco/ocDgQt6T">Cisco</a>, <a href="/facts/Google/GT9Sugza">Google</a>, <a href="/facts/Huawei/Qwu0tbnL">Huawei</a>, <a href="/facts/IBM/QszA7nwd">IBM</a>, <a href="/facts/Microsoft/nGIDDXdx">Microsoft</a>, and <a href="/facts/Red_Hat/5rhmBLBa">Red Hat</a>.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a></li> <li>June 8, 2016: Microsoft announced that Docker could now be used natively on <a href="/facts/Windows_10/be9IHehJ">Windows 10</a>.<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a></li> <li>January 2017: An analysis of <a href="/facts/LinkedIn/Iq2IcNMt">LinkedIn</a> profile mentions showed Docker presence grew by 160% in 2016.<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a></li> <li>May 6, 2019: Microsoft announced the second version of <a href="/facts/Windows_Subsystem_for_Linux/ou97bFN2">Windows Subsystem for Linux</a> (WSL). Docker, Inc. announced that it had started working on a version of Docker for Windows to run on WSL 2.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a> In particular, this meant Docker could run on Windows 10 Home (previously it was limited to Windows Pro and Enterprise since it used <a href="/facts/Hyper-V/3Qm0yJsv">Hyper-V</a>).</li> <li>August 2020: Microsoft announced a backport of WSL2 to Windows 10 versions 1903 and 1909 (previously WSL2 was available only on version 2004)<a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a> and Docker developers announced availability of Docker for these platforms.<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a></li> <li>August 2021: Docker Desktop for Windows and MacOS was no longer available free of charge for enterprise users. Docker ended free Docker Desktop use for larger business customers and replaced its Free Plan with a Personal Plan. Docker Engine on Linux distributions remained unaffected.<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a></li> <li>December 2023: Docker acquired AtomicJar to expand its testing capabilities.<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a></li></ul> <h2 id="see-also">See also</h2> <ul> <li>Linux portal</li></ul> <ul><li><a href="/facts/DevOps/yRg6dIBc">DevOps</a></li> <li><a href="/facts/DevOps_toolchain/gl2yK848">DevOps toolchain</a></li> <li><a href="/facts/GVisor/ax0stnUj">gVisor</a></li> <li><a href="/facts/Kubernetes/CI61Msu0">Kubernetes</a></li> <li><a href="/facts/List_of_Linux_containers/50kMGp0n">List of Linux containers</a></li> <li><a href="/facts/Microservices/1zGcNFSj">Microservices</a></li> <li><a href="/facts/OS-level_virtualization/gkLoCrgN">OS-level virtualization</a></li> <li><a href="/facts/Podman/5bS9dQCn">Podman</a></li> <li><a href="/facts/Service_Component_Architecture/vBLGhsA2">Service Component Architecture</a></li> <li><a href="/facts/Singularity_(software)/btm1vB38">Singularity</a> – Docker alternative for HPC clusters</li> <li><a href="/facts/Open_Container_Initiative/dvvVEUPq">Open Container Initiative</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://www.docker.com">Official website</a> </li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>O'Gara, Maureen (July 26, 2013). "Ben Golub, Who Sold Gluster to Red Hat, Now Running dotCloud". SYS-CON Media. Archived from the original on September 13, 2019. <a href="https://web.archive.org/web/20190913100835/http://maureenogara.sys-con.com/node/2747331" target="_blank">https://web.archive.org/web/20190913100835/http://maureenogara.sys-con.com/node/2747331</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"What is a Container?". docker.com. Docker, Inc. Retrieved May 13, 2019. <a href="https://www.docker.com/resources/what-container" target="_blank">https://www.docker.com/resources/what-container</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Ratan, Vivek (February 8, 2017). "Docker: A Favourite in the DevOps World". Open Source For U. Retrieved June 14, 2017. <a href="http://opensourceforu.com/2017/02/docker-favourite-devops-world/" target="_blank">http://opensourceforu.com/2017/02/docker-favourite-devops-world/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Use containers to Build, Share and Run your applications". docker.com. <a href="https://www.docker.com/resources/what-container/" target="_blank">https://www.docker.com/resources/what-container/</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"What is a Container?". docker.com. Docker, Inc. Retrieved May 13, 2019. <a href="https://www.docker.com/resources/what-container" target="_blank">https://www.docker.com/resources/what-container</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Noyes, Katherine (August 1, 2013). "Docker: A 'Shipping Container' for Linux Code". Linux.com. Archived from the original on August 8, 2013. Retrieved August 9, 2013. <a href="https://web.archive.org/web/20130808043357/http://www.linux.com/news/enterprise/cloud-computing/731454-docker-a-shipping-container-for-linux-code/" target="_blank">https://web.archive.org/web/20130808043357/http://www.linux.com/news/enterprise/cloud-computing/731454-docker-a-shipping-container-for-linux-code/</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"Select a storage driver documentation". Docker documentation. Archived from the original on December 6, 2016. Retrieved December 7, 2016. <a href="https://archive.today/20161206132431/https://docs.docker.com/engine/userguide/storagedriver/selectadriver/" target="_blank">https://archive.today/20161206132431/https://docs.docker.com/engine/userguide/storagedriver/selectadriver/</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"Get started with Docker for Mac". docker.com. Docker, Inc. Retrieved September 27, 2018. <a href="https://docs.docker.com/docker-for-mac/" target="_blank">https://docs.docker.com/docker-for-mac/</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>K., Chris (14 January 2019). "Lightweight Windows containers: Using Docker process isolation in Windows 10". Poweruser. Retrieved 2 August 2019. more "lightweight" real containers (via so called process-isolation), where the containerized processes are running directly on the host system — all processes on the host and in the containers are sharing the same Windows kernel. This is similar to how containers on Linux work. <a href="https://poweruser.blog/lightweight-windows-containers-using-docker-process-isolation-in-windows-10-62519be76c8c" target="_blank">https://poweruser.blog/lightweight-windows-containers-using-docker-process-isolation-in-windows-10-62519be76c8c</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>"8 surprising facts about real Docker adoption". Datadog. June 2018. Retrieved September 4, 2019. <a href="https://www.datadoghq.com/docker-adoption/" target="_blank">https://www.datadoghq.com/docker-adoption/</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Gupta, Devender (October 13, 2022). "How to Install Docker on Raspberry Pi". Gizmoxo. 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