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itemprop="name">Kubernetes Resources Setup</span></a><meta itemprop="position" content="3"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Workloads and Pods</span><meta itemprop="position" content="4"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Latest</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Kubernetes Workloads and Pods</h1></header><p>You can build any complex containerized application in Kubernetes using two basic constructs: pods and workloads. Once you build an application, you can expose it for access either within the same cluster or on the Internet using a third construct: services.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="pods">Pods<a href="#pods" class="hash-link" aria-label="Direct link to Pods" title="Direct link to Pods"></a></h3><p><a href="https://kubernetes.io/docs/concepts/workloads/pods/pod-overview/" target="_blank" rel="noopener noreferrer"><em>Pods</em></a> are one or more containers that share network namespaces and storage volumes. Most pods have only one container. Therefore when we discuss <em>pods</em>, the term is often synonymous with <em>containers</em>. You scale pods the same way you scale containers—by having multiple instances of the same pod that implement a service. Usually pods get scaled and managed by the workload.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="workloads">Workloads<a href="#workloads" class="hash-link" aria-label="Direct link to Workloads" title="Direct link to Workloads"></a></h3><p><em>Workloads</em> are objects that set deployment rules for pods. Based on these rules, Kubernetes performs the deployment and updates the workload with the current state of the application.
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Workloads let you define the rules for application scheduling, scaling, and upgrade.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="workload-types">Workload Types<a href="#workload-types" class="hash-link" aria-label="Direct link to Workload Types" title="Direct link to Workload Types"></a></h4><p>Kubernetes divides workloads into different types. The most popular types supported by Kubernetes are:</p><ul><li><p><a href="https://kubernetes.io/docs/concepts/workloads/controllers/deployment/" target="_blank" rel="noopener noreferrer">Deployments</a></p><p> <em>Deployments</em> are best used for stateless applications (i.e., when you don't have to maintain the workload's state). Pods managed by deployment workloads are treated as independent and disposable. If a pod encounters disruption, Kubernetes removes it and then recreates it. An example application would be an Nginx web server.</p></li><li><p><a href="https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/" target="_blank" rel="noopener noreferrer">StatefulSets</a></p><p> <em>StatefulSets</em>, in contrast to deployments, are best used when your application needs to maintain its identity and store data. An application would be something like Zookeeper—an application that requires a database for storage.</p></li><li><p><a href="https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/" target="_blank" rel="noopener noreferrer">DaemonSets</a></p><p> <em>Daemonsets</em> ensures that every node in the cluster runs a copy of pod. For use cases where you're collecting logs or monitoring node performance, this daemon-like workload works best.</p></li><li><p><a href="https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion/" target="_blank" rel="noopener noreferrer">Jobs</a></p><p> <em>Jobs</em> launch one or more pods and ensure that a specified number of them successfully terminate. Jobs are best used to run a finite task to completion as opposed to managing an ongoing desired application state.</p></li><li><p><a href="https://kubernetes.io/docs/concepts/workloads/controllers/cron-jobs/" target="_blank" rel="noopener noreferrer">CronJobs</a></p><p> <em>CronJobs</em> are similar to jobs. CronJobs, however, runs to completion on a cron-based schedule.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="services">Services<a href="#services" class="hash-link" aria-label="Direct link to Services" title="Direct link to Services"></a></h3><p>In many use cases, a workload has to be either:</p><ul><li>Accessed by other workloads in the cluster.</li><li>Exposed to the outside world.</li></ul><p>You can achieve these goals by creating a <em>Service</em>. Services are mapped to the underlying workload's pods using a <a href="https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#service-and-replicationcontroller" target="_blank" rel="noopener noreferrer">selector/label approach (view the code samples)</a>. Rancher UI simplifies this mapping process by automatically creating a service along with the workload, using the service port and type that you select.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="service-types">Service Types<a href="#service-types" class="hash-link" aria-label="Direct link to Service Types" title="Direct link to Service Types"></a></h4><p>There are several types of services available in Rancher. The descriptions below are sourced from the <a href="https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types" target="_blank" rel="noopener noreferrer">Kubernetes Documentation</a>.</p><ul><li><p><strong>ClusterIP</strong></p><blockquote><p>Exposes the service on a cluster-internal IP. Choosing this value makes the service only reachable from within the cluster. This is the default <code>ServiceType</code>.</p></blockquote></li><li><p><strong>NodePort</strong></p><blockquote><p>Exposes the service on each Node’s IP at a static port (the <code>NodePort</code>). A <code>ClusterIP</code> service, to which the <code>NodePort</code> service will route, is automatically created. You’ll be able to contact the <code>NodePort</code> service, from outside the cluster, by requesting <code><NodeIP>:<NodePort></code>.</p></blockquote></li><li><p><strong>LoadBalancer</strong></p><blockquote><p>Exposes the service externally using a cloud provider’s load balancer. <code>NodePort</code> and <code>ClusterIP</code> services, to which the external load balancer will route, are automatically created.</p></blockquote></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="workload-options">Workload Options<a href="#workload-options" class="hash-link" aria-label="Direct link to Workload Options" title="Direct link to Workload Options"></a></h2><p>This section of the documentation contains instructions for deploying workloads and using workload options.</p><ul><li><a href="/how-to-guides/new-user-guides/kubernetes-resources-setup/workloads-and-pods/deploy-workloads">Deploy Workloads</a></li><li><a href="/how-to-guides/new-user-guides/kubernetes-resources-setup/workloads-and-pods/upgrade-workloads">Upgrade Workloads</a></li><li><a href="/how-to-guides/new-user-guides/kubernetes-resources-setup/workloads-and-pods/roll-back-workloads">Rollback Workloads</a></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="related-links">Related Links<a href="#related-links" class="hash-link" aria-label="Direct link to Related Links" title="Direct link to Related Links"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="external-links">External Links<a href="#external-links" class="hash-link" aria-label="Direct link to External Links" title="Direct link to External Links"></a></h3><ul><li><a href="https://kubernetes.io/docs/concepts/services-networking/service/" target="_blank" rel="noopener noreferrer">Services</a></li></ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/rancher/rancher-docs/edit/main/docs/pages-for-subheaders/workloads-and-pods.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2023-08-15T19:24:51.000Z">Aug 15, 2023</time></b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/pages-for-subheaders/kubernetes-resources-setup"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Kubernetes Resources</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/how-to-guides/new-user-guides/kubernetes-resources-setup/workloads-and-pods/deploy-workloads"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Deploying Workloads</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#pods" class="table-of-contents__link toc-highlight">Pods</a></li><li><a href="#workloads" class="table-of-contents__link toc-highlight">Workloads</a></li><li><a href="#services" class="table-of-contents__link toc-highlight">Services</a></li><li><a href="#workload-options" class="table-of-contents__link toc-highlight">Workload Options</a></li><li><a href="#related-links" class="table-of-contents__link toc-highlight">Related Links</a><ul><li><a href="#external-links" class="table-of-contents__link toc-highlight">External Links</a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2023 SUSE Rancher. 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