Introduction to Kubernetes patterns

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title="Topics" > Topics </a></li><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" width="11" height="11" viewBox="0 -18 1024 1055"><path d="M810.642 511.557c0 8.905-3.447 16.776-10.284 23.613L322.31 1013.216c-6.835 6.837-14.706 10.284-23.61 10.284s-16.776-3.447-23.613-10.284l-51.303-51.303c-6.837-6.837-10.284-14.707-10.284-23.612s3.447-16.775 10.284-23.61L626.972 511.5 223.784 108.31c-6.837-6.835-10.284-14.706-10.284-23.61s3.447-16.776 10.284-23.613l51.303-51.303C281.924 2.947 289.794-.5 298.7-.5s16.775 3.447 23.61 10.284L800.36 487.83c6.837 6.837 10.284 14.708 10.284 23.613v.114" stroke-width="25" stroke="black"/></svg><li class="rh-navigation-link-container"><a class="rh-navigation-link-item" href="/en/topics/containers" title="Containers" > Containers </a></li><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" width="11" height="11" viewBox="0 -18 1024 1055"><path d="M810.642 511.557c0 8.905-3.447 16.776-10.284 23.613L322.31 1013.216c-6.835 6.837-14.706 10.284-23.61 10.284s-16.776-3.447-23.613-10.284l-51.303-51.303c-6.837-6.837-10.284-14.707-10.284-23.612s3.447-16.775 10.284-23.61L626.972 511.5 223.784 108.31c-6.837-6.835-10.284-14.706-10.284-23.61s3.447-16.776 10.284-23.613l51.303-51.303C281.924 2.947 289.794-.5 298.7-.5s16.775 3.447 23.61 10.284L800.36 487.83c6.837 6.837 10.284 14.708 10.284 23.613v.114" stroke-width="25" stroke="black"/></svg><li class="rh-navigation-link-container"> Introduction to Kubernetes patterns </li></ul> </div> <div class="rhdc-article-hero-headline dx-mb-4 dx-mt-4">  <div class="rh-band-header--component" ><h1 class="rh-band-header-hero-headline" >Introduction to Kubernetes patterns</h1> </div> </div> <div class="rhdc-article-hero-front-matter">  <div class="rh-front-matter--component"><div class="rh-front-matter-wrapper" data-rh-layout="inline-horizontal"><div class="rh-front-matter-metadata"><span class="rh-front-matter-metadata-publish-date">Published <span> January 21, 2020</span></span><span class="rh-front-matter-metadata-separator">•</span><span class="rh-front-matter-metadata-readtime" for="article-contents" data-rh-hidden="sm"><em class="placeholder">4</em>-minute read</span></div><pfe-clipboard class="rh-front-matter-share" role="button" tabindex="0"><span slot="text">Copy URL</span></pfe-clipboard></div></div></div> </div> <div class="lg:dx-col-3"> </div> </div> </section> <section class="dx-band dx-pt-0 rhdc-article-body" id="rhdc-aside-promo"> <div class="dx-container dx-flex-col lg:dx-flex lg:dx-flex-row xl:dx-gap-3 lg:dx-justify-between"> <div class="lg:dx-col-1 lg:dx-col-2 dx-mb-6 lg:dx-mb-0"> <pfe-jump-links-nav id="article-nav" autobuild offset="120" sr-text="Jump to section" ></pfe-jump-links-nav> </div> <div class="rhdc-article-body--content lg:dx-col-6"> <pfe-jump-links-panel scrolltarget="article-nav" data-rh-layout="tall-stacked" pfelement="" class="PFElement" type="content">  <div class="rh-group--layout" data-rh-layout="stacked" ><div class="rh-group-body" data-rh-layout="min-stacked" ><header class="rh-standard-header--component" ><div class="rh-standard-header-container"><h2 class="rh-standard-header-headline-medium pfe-jump-links-panel__section" id="overview" nav-label="Overview" >Overview</h2></div></header><div class="rh-generic--component" ><p>A pattern describes a repeatable solution to a problem. <a href="/en/engage/kubernetes-containers-architecture-s-201910240918?intcmp=701f2000001OMH6AAO">Kubernetes patterns</a> are design patterns for container-based applications and services.  </p><p><a href="/en/topics/containers/what-is-kubernetes">Kubernetes</a> can help developers write <a href="/en/topics/cloud-native-apps">cloud-native apps</a>, and it provides a library of application programing interfaces (APIs) and tools for building applications. </p><p>However, Kubernetes doesn’t provide developers and architects with guidelines for how to use these pieces to build a complete system that meets business needs and goals. </p><p>Patterns are a way to reuse architectures. Instead of completely creating the architecture yourself, you can use existing Kubernetes patterns, which also ensure that things will work the way they’re supposed to. </p><p>When you are trying to deliver important business services on top of Kubernetes, learning through trial and error is too time-consuming, and can result in problems like downtime and disruption. </p><p>Think of a pattern like a blueprint; it shows you the way to solve a whole class of similar problems. A pattern is more than just step-by-step instructions for fixing one specific problem.</p><p>Using a pattern may result in somewhat different outcomes; they aren’t meant to provide an identical solution. Your system may look different from someone else who used the same pattern. However, both systems will share common characteristics. </p><p>By using Kubernetes patterns, developers can create cloud-native apps with Kubernetes as a runtime platform.</p><rh-cta variant="primary"><a href="/en/engage/kubernetes-containers-architecture-s-201910240918" title="SOLP: Kubernetes Patterns" target="_self" data-analytics-linktype="cta" data-analytics-text="Get started with the Kubernetes patterns e-book">Get started with the Kubernetes patterns e-book</a></rh-cta></div></div></div>  <div class="rh-group--layout" data-rh-layout="stacked" ><div class="rh-group-body" data-rh-layout="min-stacked" ><header class="rh-standard-header--component" ><div class="rh-standard-header-container"><h2 class="rh-standard-header-headline-medium pfe-jump-links-panel__section" id="kubernetes-patterns" nav-label="Kubernetes patterns" >Types of Kubernetes patterns</h2></div></header><div class="rh-generic--component" ><p>Patterns are the tools needed by a Kubernetes developer, and they will show you how to build your system.</p><ul><li><strong>Foundational patterns</strong> cover the core concepts of Kubernetes. These patterns are the underlying principles and practices for building container-based cloud-native applications. </li><li><strong>Behavioral patterns</strong> describe the patterns that sit on top of foundational patterns and add granularity to concepts for managing various types of container and platform interactions. </li><li><strong>Structural patterns</strong> are related to organizing containers within a Kubernetes pod. </li><li><strong>Configuration patterns</strong> are used for the various ways application configuration can be handled in Kubernetes. These patterns include the specific steps for connecting applications to their configuration. </li><li><strong>Advanced patterns</strong> include advanced concepts, such as how the platform itself can be extended or how to build container images directly within the cluster.</li></ul></div></div></div> <div class="rhdc--inline-promo" data-rh-mbox="inline-promo">  <div class="rh-card--layout rh-promo-article" data-rh-promo=inline data-rh-border-radius=none data-rh-background="gray" data-rh-theme="light" data-rh-bg-align="cover" data-rh-layout="fit-content-33" data-rh-border="top-bottom"><div class="rh-card-content" data-rh-layout="stacked" ><div class="rh-group--layout" data-rh-layout="stacked" ><div class="rh-group-body" data-rh-layout="min-stacked" ><div class="rh-band-header--component" data-rh-align=left ><h2 class="rh-band-header-subsection-headline" id="rh-gthwu">Red Hat resources</h2></div></div></div></div><footer class="rh-card-footer" ><div class="rh-group--layout" ><div class="rh-group-body" data-rh-layout="min-stacked" ><span class="rh-cta--component" data-rh-cta-type="secondary" ><a class="rh-cta-link" href="/en/resources" title="Keep reading" data-analytics-linkType="cta" data-analytics-text="Keep reading" data-analytics-category="Inline promo | Red Hat resources" >Keep reading<span aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 36 36"><path d="M31.58 18.24a.64.64 0 0 0-.14-.68l-9-9c-.56-.58-1.47.32-.88.88l7.93 7.94H5a.62.62 0 1 0 0 1.24h24.49l-7.93 7.94a.62.62 0 0 0 .88.88l9-9a.72.72 0 0 0 .14-.2Z"/></svg></span></a></span></div></div></footer></div> </div>  <div class="rh-group--layout" data-rh-layout="stacked" ><div class="rh-group-body" data-rh-layout="min-stacked" ><header class="rh-standard-header--component" ><div class="rh-standard-header-container"><h2 class="rh-standard-header-headline-medium pfe-jump-links-panel__section" id="use-cases" nav-label="Use cases" >Use cases for Kubernetes patterns</h2></div></header><div class="rh-generic--component" ><h4>Predictable demands patterns</h4><p>Predictable demands patterns are foundational Kubernetes patterns. This type of pattern ensures that your apps comply with the fundamental principles of containerized apps so that they are ready to be automated using Kubernetes. </p><p>Predictable demands patterns explain why every container needs to declare the app resource requirements and runtime dependencies. Defining these requirements allows Kubernetes to choose the right place to deploy the app within your <a href="/en/topics/containers/what-is-a-kubernetes-cluster">cluster</a>. </p><p>Examples of what you can define using these patterns are runtime dependencies, resource profiles, pod priority, and project resources.</p><h5>Example: Resource profiles</h5><p>You will need to specify the resource requirements, such as CPU and memory, of a container in the form of a request and a limit. A request refers to the minimum amount of resources needed, while a limit refers to the maximum amount of resources a container can consume. </p><p>The requests amount is used by the scheduler when placing pods to nodes. The scheduler will only schedule a pod to a node that has enough capacity to accommodate it.  </p><p>If resource requirements aren’t set, the container will be considered a lower priority and killed first if the node runs out of available resources.</p><h3>Configuration patterns</h3><p>All applications require configuration, and although storing configurations in the source code is an easy option, it doesn’t give you the flexibility to adapt configuration without recreating the app image. External configuration allows you to adapt based on the environment.</p><p>Configuration patterns will help you to customize and adapt your apps with external configurations for different development, integration, and production environments. </p><h5>Example: EnVar configuration</h5><p>The EnVar configuration pattern works best for small sets of configuration variables, where universally supported environmental variables can be used to externalize configuration. </p><p>Externalizing the configuration of an app allows you to make changes to configuration even after the app has been built, compared with hardcoded configuration that would require a rebuild of the app. </p><p>Using environmental variables to externalize configuration works well because any operating system can define these variables and they are accessible by any programming language. </p><p>With environmental variables, hardcoded default values are typically defined during build and then overwritten during runtime.</p><p>In Kubernetes, variables can be set directly in the pod specification of a controller like <a href="/en/topics/containers/what-is-kubernetes-deployment">deployment </a>or replica set. You can attach values directly to environmental variables, which can be managed separately from the pod definition.</p><p>You can also use a delegation to Kubernetes Secrets (for sensitive data) and ConfigMaps (for non-sensitive configuration).</p><h3>Advanced patterns</h3><p>These patterns include complex topics and the newest pattern implementations. The controller, operator, elastic scale, and <a href="/en/topics/linux/what-is-an-image-builder">image builder</a> patterns are all examples of advanced Kubernetes patterns.</p><h5>Example: Elastic scale </h5><p>The elastic scale pattern is used to scale an application horizontally, by adapting the number of pod replicas, vertically, by adapting resource requirements for pods, and can scale the cluster itself by changing the number of cluster nodes.</p><p>Although you can handle scale manually, the elastic scale pattern allows Kubernetes to scale automatically based on load. </p><p>With Kubernetes, you can change a container’s resources, the desired replicas for a service, or the number of nodes in the cluster. It can also monitor external load and capacity-related events, analyze the container state, and scale for desired performance. </p><p>Horizontal pod autoscaling allows you to define an app capacity that is not fixed, but that has enough capacity to handle a varying load. A horizontal pod autoscaler is used to scale pods. </p><p>In order to use the horizontal pod autoscaler, the metrics server, a cluster-wide aggregator of resource usage data, needs to be enabled, and a CPU resource limit needs to be defined. You can create a definition for the horizontal pod autoscaler from the command line. </p><p>The horizontal pod autoscaler controller continuously retrieves metrics about the pods that are related to scaling, based on the previously determined definition you set from the command line. </p><p>It also calculates the required number of replicas based on the current value and the desired value, and changes declared replicas to maintain the new desired state</p><p><rh-cta><a href="/en/engage/kubernetes-containers-architecture-s-201910240918" title="SOLP: Kubernetes Patterns" data-analytics-linktype="cta" data-analytics-text="Explore more Kubernetes patterns">Explore more Kubernetes patterns</a></rh-cta></p></div></div></div>  <div class="rh-group--layout" data-rh-layout="stacked" ><div class="rh-group-body" data-rh-layout="min-stacked" ><header class="rh-standard-header--component" ><div class="rh-standard-header-container"><h2 class="rh-standard-header-headline-medium pfe-jump-links-panel__section" id="kubernetes-for-the-enterprise" nav-label="Kubernetes for the enterprise" >Kubernetes for the enterprise</h2></div></header><div class="rh-generic--component" ><p><a href="/en/technologies/cloud-computing/openshift">Red Hat® OpenShift®</a> is an enterprise-ready Kubernetes platform. It gives developers self-service environments for building, and full-stack automated operations on any infrastructure.</p><div class="ux-video-embed"><div class="ux-video-embed-media-container"><div class="ux-video-embed-iframe-container"><iframe allowfullscreen="allowfullscreen" frameborder="0" height="422" src="https://www.youtube.com/embed/xEofcsd6HGg" width="750" loading="lazy"></iframe></div></div></div><p>Red Hat OpenShift includes all of the extra pieces of technology that makes Kubernetes powerful and viable for the enterprise, including: registry, networking, telemetry, security, automation, and services.</p><p>With Red Hat OpenShift, developers can make new containerized apps, host them, and deploy them in the cloud with the scalability, control, and orchestration that can turn a good idea into new business quickly and easily.</p><p><rh-cta><a href="/en/technologies/cloud-computing/openshift/try-it" data-analytics-linktype="cta" data-analytics-text="Try Red Hat OpenShift">Try 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