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content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/pages-for-subheaders/kubernetes-resources-setup"><span 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.
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&#x27;t have to maintain the workload&#x27;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&#x27;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&#x27;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>&lt;NodeIP&gt;:&lt;NodePort&gt;</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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