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<!--replace-end-7--><!--replace-end-4--><!--replace-end-1--></head><body><div class="ui fluid container universe"><!--replace-start-2--><!--replace-start-3--><!--replace-start-6--><div class="ui text container" id="zettel-container" style="position: relative"><div class="zettel-view"><article class="ui raised attached segment zettel-content"><div class="pandoc"><h1 id="title-h1">Docker: general overview</h1><blockquote><p>Docker is an ecosystem of tools for creating, running and transporting containers.</p></blockquote><p>The main product of the Docker company is Docker Desktop - a UI for running containers however the actual <code>docker</code> software is free and open source.</p><p>Docker standardised the use of containers set up the open-source Open Container Initiative which is a convention agreed upon by the major tech companies. It codifies the following:</p><ul><li>Docker runtime specification</li><li>Docker image specification</li><li>Docker registry specification</li></ul><h2 id="main-components">Main components</h2><ul><li><strong>Docker Engine</strong><ul><li>The core component</li><li>Exposes the Docker API and manages the entire workflow around creating, running and deploying containers</li></ul></li><li><strong>Docker Client</strong><ul><li>The Docker CLI</li><li>The primary means of interacting with the Docker Engine</li><li>Provides commands for managing images, containers and other Docker objects</li></ul></li><li><strong>Docker Compose</strong><ul><li>A tool for defining and running multi-container applications</li><li>Define the configuration for all of the containers that make up the application in a single YAML file</li></ul></li><li><strong>Docker Images</strong><ul><li>See below</li></ul></li><li><strong>Docker Containers</strong><ul><li>See below</li></ul></li><li><strong>Docker Registry</strong><ul><li>A centralised location where Docker iamges can be stored and shared</li><li>DockerHub is the registry provided by Docker</li><li>Organisations can set up their own private registries</li></ul></li></ul><h2 id="docker-images">Docker images</h2><p>An image is a blueprint that contains the instructions to build a container. It’s an immutable snapshot of the file system and configuration of an application. Images can be easily shared between developers.</p><p>They are runnable packages that contain everything needed to run an application including the binaries, libraries, resources and other dependencies.</p><p>It does not contain an operating sytem but may include a particular Linux distribution.</p><h2 id="docker-containers">Docker containers</h2><p>A container is a runnign instance of a Docker image. Multiple, identical containers can be launched from the same, single image.</p><h2 id="docker-architectural-overview">Docker architectural overview</h2><p>See <span class="zettel-link-container cf"><span class="zettel-link" title="Zettel: Docker architecture"><a href="Docker_architecture.html">Docker architecture</a></span></span>.</p></div></article><nav class="ui attached segment deemphasized bottomPane" id="neuron-tags-pane"><div><span class="ui basic label zettel-tag" title="Tag">containerization</span><span class="ui basic label zettel-tag" title="Tag">docker</span></div></nav><nav class="ui bottom attached icon compact inverted menu blue" id="neuron-nav-bar"><!--replace-start-9--><!--replace-end-9--><a class="right item" href="impulse.html" title="Open Impulse"><i class="wave square icon"></i></a></nav></div></div><!--replace-end-6--><!--replace-end-3--><!--replace-end-2--><div class="ui center aligned container footer-version"><div class="ui tiny image"><a href="https://neuron.zettel.page"><img alt="logo" src="https://raw.githubusercontent.com/srid/neuron/master/assets/neuron.svg" title="Generated by Neuron 1.9.35.3" /></a></div></div></div></body></html>
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