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itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Namespace Resource Quota</span><meta itemprop="position" content="3"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 1.1.0</span><div class="tocCollapsible_GaFJ theme-doc-toc-mobile tocMobile_pwPL"><button type="button" class="clean-btn tocCollapsibleButton_I6fr">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Namespace Resource Quota</h1></header><p>In K8s, user can setup namespace with <a href="https://kubernetes.io/docs/concepts/policy/resource-quotas/" target="_blank" rel="noopener noreferrer">resource quotas</a> to limit aggregated resource consumption in this namespace. The validation of namespace resource quotas is handled in api-server directly, therefore YuniKorn simply honors the quotas like the default scheduler.</p> |
| <h2 class="anchor anchorWithStickyNavbar_X9mg" id="best-practice">Best practice<a href="#best-practice" class="hash-link" aria-label="Direct link to Best practice" title="Direct link to Best practice"></a></h2> |
| <p>It is not mandatory to setup YuniKorn queues with respect of namespaces. |
| However, in practice, it makes more sense to do so. |
| Namespace is often used to set a cap for resource consumptions per user-group/team, |
| YuniKorn queue is also meant to divide cluster resource into multiple groups. |
| Let's go through an example.</p> |
| <h3 class="anchor anchorWithStickyNavbar_X9mg" id="1-setup-namespace">1. Setup namespace<a href="#1-setup-namespace" class="hash-link" aria-label="Direct link to 1. Setup namespace" title="Direct link to 1. Setup namespace"></a></h3> |
| <p>Namespace: <code>advertisement</code>:</p> |
| <div class="codeBlockContainer_EajB theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_yYRp"><pre tabindex="0" class="prism-code language-text codeBlock_z86c thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_zIeA"><span class="token-line" style="color:#bfc7d5"><span class="token plain">apiVersion: v1</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">kind: ResourceQuota</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">metadata:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">spec:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> hard:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> requests.cpu: "200m"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> requests.memory: 2000Mi</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> limits.cpu: "200m"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> limits.memory: 4000Mi</span><br></span></code></pre><div class="buttonGroup_mp8g"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_HhJ2" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_giQl"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_Nh_7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>Create the namespace</p> |
| <div class="codeBlockContainer_EajB theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_yYRp"><pre tabindex="0" class="prism-code language-text codeBlock_z86c thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_zIeA"><span class="token-line" style="color:#bfc7d5"><span class="token plain">kubectl create namespace advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">kubectl create -f ./advertisement.yaml --namespace=advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">kubectl get quota --namespace=advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">kubectl describe quota advertisement --namespace=advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">// output</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Name: advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Namespace: advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Resource Used Hard</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">-------- ---- ----</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">limits.cpu 0 200m</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">limits.memory 0 4000Mi</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">requests.cpu 0 200m</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">requests.memory 0 2000Mi</span><br></span></code></pre><div class="buttonGroup_mp8g"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_HhJ2" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_giQl"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_Nh_7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <h3 class="anchor anchorWithStickyNavbar_X9mg" id="2-setup-yunikorn-queues">2. Setup YuniKorn queues<a href="#2-setup-yunikorn-queues" class="hash-link" aria-label="Direct link to 2. Setup YuniKorn queues" title="Direct link to 2. Setup YuniKorn queues"></a></h3> |
| <p>Queue: <code>advertisement</code>:</p> |
| <div class="codeBlockContainer_EajB theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_yYRp"><pre tabindex="0" class="prism-code language-text codeBlock_z86c thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_zIeA"><span class="token-line" style="color:#bfc7d5"><span class="token plain">name: advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">resources:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> guaranteed:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> vcore: 100</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> memory: 1000</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> max:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> vcore: 200</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> memory: 2000</span><br></span></code></pre><div class="buttonGroup_mp8g"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_HhJ2" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_giQl"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_Nh_7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>ensure <code>QueueMaxResource <= NamespaceResourceQuotaRequests</code></p> |
| <h3 class="anchor anchorWithStickyNavbar_X9mg" id="3-mapping-applications-to-queues--namespace">3. Mapping applications to queues & namespace<a href="#3-mapping-applications-to-queues--namespace" class="hash-link" aria-label="Direct link to 3. Mapping applications to queues & namespace" title="Direct link to 3. Mapping applications to queues & namespace"></a></h3> |
| <p>In a pod spec</p> |
| <div class="codeBlockContainer_EajB theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_yYRp"><pre tabindex="0" class="prism-code language-text codeBlock_z86c thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_zIeA"><span class="token-line" style="color:#bfc7d5"><span class="token plain">apiVersion: v1</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">kind: Pod</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">metadata:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> namespace: advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> labels:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> app: sleep</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> applicationId: "application_2019_01_22_00001"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> queue: "root.advertisement"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: task0</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">spec:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> schedulerName: yunikorn</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> containers:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - name: sleep-5s</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> image: "alpine:latest"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> command: ["/bin/ash", "-ec", "while :; do echo '.'; sleep 5 ; done"]</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> resources:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> requests:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> cpu: "50m"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> memory: "800M"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> limits:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> cpu: "100m"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> memory: "1000M"</span><br></span></code></pre><div class="buttonGroup_mp8g"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_HhJ2" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_giQl"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_Nh_7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>Check Quota</p> |
| <div class="codeBlockContainer_EajB theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_yYRp"><pre tabindex="0" class="prism-code language-text codeBlock_z86c thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_zIeA"><span class="token-line" style="color:#bfc7d5"><span class="token plain">kubectl describe quota advertisement --namespace=advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Name: advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Namespace: advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Resource Used Hard</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">-------- ---- ----</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">limits.cpu 100m 200m</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">limits.memory 1G 4000Mi</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">requests.cpu 50m 200m</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">requests.memory 800M 2000Mi</span><br></span></code></pre><div class="buttonGroup_mp8g"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_HhJ2" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_giQl"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_Nh_7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>Now submit another application,</p> |
| <div class="codeBlockContainer_EajB theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_yYRp"><pre tabindex="0" class="prism-code language-text codeBlock_z86c thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_zIeA"><span class="token-line" style="color:#bfc7d5"><span class="token plain">apiVersion: v1</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">kind: Pod</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">metadata:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> namespace: advertisement</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> labels:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> app: sleep</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> applicationId: "application_2019_01_22_00002"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> queue: "root.advertisement"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: task1</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">spec:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> schedulerName: yunikorn</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> containers:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - name: sleep-5s</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> image: "alpine:latest"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> command: ["/bin/ash", "-ec", "while :; do echo '.'; sleep 5 ; done"]</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> resources:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> requests:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> cpu: "200m"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> memory: "800M"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> limits:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> cpu: "200m"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> memory: "1000M"</span><br></span></code></pre><div class="buttonGroup_mp8g"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_HhJ2" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_giQl"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_Nh_7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <p>pod will not be able to submitted to api-server, because the requested cpu <code>200m</code> + used cpu <code>100m</code> = <code>300m</code> which exceeds the resource quota.</p> |
| <div class="codeBlockContainer_EajB theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_yYRp"><pre tabindex="0" class="prism-code language-text codeBlock_z86c thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_zIeA"><span class="token-line" style="color:#bfc7d5"><span class="token plain">kubectl create -f pod_ns_adv_task1.yaml</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Error from server (Forbidden): error when creating "pod_ns_adv_task1.yaml": pods "task1" is forbidden: exceeded quota: advertisement, requested: limits.cpu=200m,requests.cpu=200m, used: limits.cpu=100m,requests.cpu=50m, limited: limits.cpu=200m,requests.cpu=200m</span><br></span></code></pre><div class="buttonGroup_mp8g"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_HhJ2" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_giQl"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_Nh_7"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> |
| <h2 class="anchor anchorWithStickyNavbar_X9mg" id="future-work">Future Work<a href="#future-work" class="hash-link" aria-label="Direct link to Future Work" title="Direct link to Future Work"></a></h2> |
| <p>For compatibility, we should respect namespaces and resource quotas. |
| Resource quota is overlapped with queue configuration in many ways, |
| for example the <code>requests</code> quota is just like queue's max resource. However, |
| there are still a few features resource quota can do but queue cannot, such as</p> |
| <ol> |
| <li>Resource <code>limits</code>. The aggregated resource from all pods in a namespace cannot exceed this limit.</li> |
| <li>Storage Resource Quota, e.g storage size, PVC number, etc.</li> |
| <li>Object Count Quotas, e.g count of PVCs, services, configmaps, etc.</li> |
| <li>Resource Quota can map to priority class.</li> |
| </ol> |
| <p>Probably we can build something similar to cover (3) in this list. |
| But it would be hard to completely support all these cases.</p> |
| <p>But currently, setting applications mapping to a queue as well as a corresponding namespace is over complex. |
| Some future improvements might be:</p> |
| <ol> |
| <li>Automatically detects namespaces in k8s-shim and map them to queues. Behind the scenes, we automatically generates queue configuration based on namespace definition. Generated queues are attached under root queue.</li> |
| <li>When new namespace added/updated/removed, similarly to (1), we automatically update queues.</li> |
| <li>User can add more configuration to queues, e.g add queue ACL, add child queues on the generated queues.</li> |
| <li>Applications submitted to namespaces are transparently submitted to corresponding queues.</li> |
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