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4.625V15.857142857142858c0 0.3504428571428571 0.13922571428571429 0.6866142857142856 0.38703321428571424 0.9343821428571427C1.9562825 17.039292857142858 2.292387857142857 17.178571428571427 2.642857142857143 17.178571428571427h13.214285714285714c0.3504428571428571 0 0.6866142857142856 -0.13927857142857142 0.9343821428571427 -0.38704642857142857S17.178571428571427 16.207585714285713 17.178571428571427 15.857142857142858V4.625c0 -0.3504692857142857 -0.13927857142857142 -0.6865746428571428 -0.38704642857142857 -0.9343953571428572C16.543757142857142 3.442797142857143 16.207585714285713 3.3035714285714284 15.857142857142858 3.3035714285714284H2.642857142857143Z" stroke-width="1.5"></path><path id="Vector_2" stroke="#6633cc" stroke-linecap="round" stroke-linejoin="round" d="M1.3214285714285714 7.928571428571429h15.857142857142858" stroke-width="1.5"></path><path id="Vector_3" stroke="#6633cc" stroke-linecap="round" stroke-linejoin="round" d="M4.625 1.3214285714285714v3.9642857142857144" 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src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/67be3dfb7da02da09c8d529f_66196071ce8e67a8986423a2_exclamation-circle%402x%20(1).svg" loading="lazy" alt="" class="nav-link-icon-hover"/></div><div class="nav-link-block-title-text">Detected Risks</div></div><p class="nav-link-block-paragraph max-custom-desktop">Continuously monitor systems for critical reliability risks.</p></a></div><div role="listitem" class="nav-link-collection-item w-dyn-item"><a data-w-id="0a2e360a-35b0-96d4-18f7-4c9082721085" href="/technologies/dependency-discovery" class="nav-link-block-updated w-inline-block"><div class="nav-link-block-title"><div class="nav-link-icon-wrapper"><img src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/67be3f06199615571bb04f94_661fef5579870fd1603efde8_%5Bicon%5D%20.svg" loading="lazy" alt="" class="nav-link-icon-static"/><img 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src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/67be3f3b7245561c49f200a0_67ab79ad3b7564303b4cba33_server%402x-hover.png" loading="lazy" alt="" class="nav-link-icon-hover"/></div><div class="nav-link-block-title-text">Private Edition</div></div><p class="nav-link-block-paragraph max-custom-desktop">Deploy a private Gremlin instance in your private network.</p></a></div><div role="listitem" class="nav-link-collection-item w-dyn-item"><a data-w-id="0a2e360a-35b0-96d4-18f7-4c9082721085" href="/technologies/reliability-intelligence" class="nav-link-block-updated w-inline-block"><div class="nav-link-block-title"><div class="nav-link-icon-wrapper"><img src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/689259dd49953af6f9524efc_nav-ri-nohover.png" loading="lazy" alt="" class="nav-link-icon-static"/><img src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/689259e0b88ac6941a66065f_nav-ri-hover.png" loading="lazy" alt="" class="nav-link-icon-hover"/></div><div class="nav-link-block-title-text">Reliability Intelligence</div></div><p class="nav-link-block-paragraph max-custom-desktop">Empower your teams with custom-tailored reliability analyses, recommendations, and insights.</p></a></div><div role="listitem" class="nav-link-collection-item w-dyn-item"><a data-w-id="0a2e360a-35b0-96d4-18f7-4c9082721085" href="/technologies/disaster-recovery-testing" class="nav-link-block-updated w-inline-block"><div class="nav-link-block-title"><div class="nav-link-icon-wrapper"><img src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6977d6006a9ea4e73c2465e5_nav-drt-nohover.svg" loading="lazy" alt="" class="nav-link-icon-static"/><img src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6977d602ff60ebb670bece53_nav-drt-hover.svg" loading="lazy" alt="" class="nav-link-icon-hover"/></div><div class="nav-link-block-title-text">Disaster Recovery Testing</div></div><p class="nav-link-block-paragraph max-custom-desktop">Validate region failover processes, disaster recovery plans, incident response procedures, and more.</p></a></div></div></div></div></div><div class="nav-devider-line-bot"></div><div class="nav-devider-line-top"></div></nav></div><a href="/pricing" class="nav-link-updated w-nav-link">Pricing</a><a href="/customers" class="nav-link-updated w-nav-link">Customers</a><div data-hover="false" data-delay="0" class="nav-dropdown-updated w-dropdown"><div class="nav-dropdown-toggle-updated w-dropdown-toggle"><div>Resources</div><div class="dropdown-arrow-wrap"><div class="dropdown-arrow w-embed"><svg width="8" height="8" viewBox="0 0 8 8" fill="none" xmlns="http://www.w3.org/2000/svg">
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</script></div></div></div><div class="main-wrapper"><section data-w-id="65ced934-b2d2-964b-66af-2c794ea7409e" class="section featured-blog-hero"><div class="container featured-hero-container"><img alt="" loading="lazy" src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7dd87b9fbd815435905ea9_Blog%20Headers.png" sizes="100vw" srcset="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7dd87b9fbd815435905ea9_Blog%20Headers-p-500.png 500w, https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7dd87b9fbd815435905ea9_Blog%20Headers-p-800.png 800w, https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7dd87b9fbd815435905ea9_Blog%20Headers-p-1080.png 1080w, https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7dd87b9fbd815435905ea9_Blog%20Headers-p-1600.png 1600w, https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7dd87b9fbd815435905ea9_Blog%20Headers-p-2000.png 2000w, https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7dd87b9fbd815435905ea9_Blog%20Headers-p-2600.png 2600w, https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7dd87b9fbd815435905ea9_Blog%20Headers.png 3000w" class="featured-blog-cover-image"/><div class="column featured-blog"><div class="blog-info-wrap"><div>August 13, 2026</div><div>-</div><div class="read-time">7 min read</div></div><div class="featured-hero post"><h1 class="heading-xl-blog text-neutral">Optimizing Kubernetes pod deployments for reliability with topology spread constraints</h1></div><div class="devider-line"></div><div class="social-share-wrap"><a fs-socialshare-element="twitter" href="#" class="social-link-share twitter w-inline-block"><img src="https://cdn.prod.website-files.com/64a5291e7847ac04fe1531ad/658036aba175ab06e0f8409d_x-social-media-white-icon.webp" loading="lazy" alt="X icon for the social media site" class="social-icon-featured"/></a><a fs-socialshare-element="facebook" href="#" class="social-link-share facebook w-inline-block"><img src="https://cdn.prod.website-files.com/64a5291e7847ac04fe1531ad/64e82bfc43656941aba4fa2e_Vector%20copy.svg" loading="lazy" alt="Facebook Icon" class="social-icon-featured"/></a><a fs-socialshare-element="linkedin" href="#" class="social-link-share linkedin w-inline-block"><img src="https://cdn.prod.website-files.com/64a5291e7847ac04fe1531ad/64e82bfcf4507a268c7b46fd_Vector%20copy%202.svg" loading="lazy" alt="Linkedin Icon" class="social-icon-featured"/></a><a href="#" class="social-link-share ycombinator w-inline-block"><div class="social-icon-featured w-embed"><svg xmlns="http://www.w3.org/2000/svg" width="27px" height="27px" viewBox="0 0 24 24" fill="white" stroke-linecap="round" stroke-linejoin="round" class="CK__Icon css-4u9oyk"><path class="icon-fill" d="M0 0v24h24V0H0zm13.375 13.437v4.5h-2.5v-4.5l-4.125-7.5h2.946l2.482 5.226 2.375-5.226h2.825l-4.003 7.5z"></path></svg></div></a><div class="social-link-share w-embed"><a href="/blog/rss.xml">
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</a></div></div></div></div></section><section class="section blog-body"><div class="container grid blog-post"><div id="w-node-_6dcab4aa-f84a-8226-2f56-0aad6204d960-1519e9c6" class="rich-text-wrap"><div id="single-article" fs-richtext-element="rich-text" class="blog-rich-text w-richtext"><p>If you’re like many Kubernetes users, you don’t pay much attention to where or how Kubernetes distributes your pods. As long as they’re running, it doesn’t matter where they get deployed, right? Surely Kubernetes will use some complex algorithm to figure out the most reliable way to distribute your pods across the cluster…right?</p><p>Pod distribution plays a much bigger role in reliability than you might think. Fortunately, it’s easy to control when, where, and how Kubernetes distributes pods. By adding a few lines to your manifest, you can ensure your deployments are zone-redundant and evenly scalable. The feature is called <em>topology spread constraints</em>, and in this blog, we’ll explain how it works in full detail.</p><p>‍</p><h2>Why are topology spread constraints important for reliability?</h2><p><a href="https://kubernetes.io/docs/concepts/scheduling-eviction/topology-spread-constraints/">Topology spread constraints</a> determine how Kubernetes distributes pods across failure domains, such as regions, zones, and nodes. This helps ensure your workloads are truly distributed not just across the cluster, but across your operating environment. You can set cluster-level constraints as a default, or set constraints for individual workloads.</p><div class="w-embed"><div fs-richtext-component="block-content" class="block-in-rich-text">
<div class="tip-card-title green-tip">Note</div>
<div>We recommend <a target="_blank" href="https://kubernetes.io/docs/reference/labels-annotations-taints/#topologykubernetesioregion">labelling your nodes</a> with <code>topology.kubernetes.io/region</code> and <code>topology.kubernetes.io/zone</code> at minimum.</div>
</div></div><p>‍</p><h3>How to configure topology spread constraints</h3><p>Topology spread constraints are defined using the field spec.topologySpreadConstraints. These can be applied to a pod or to the cluster. Constraints have the following fields:</p><ul role="list"><li><code>maxSkew</code>: the degree to which pods may be unevenly distributed. Its behavior depends on the value of <code>whenUnsatisfiable</code>: <br/><ul role="list"><li>If <code>whenUnsatisfiable: DoNotSchedule</code>, this determines the maximum difference between the minimum number of pods in the domain vs. the number of matching pods in the target topology. In other words, this is how far off the minimum a domain is allowed to get.</li><li>If <code>whenUnsatisfiable: ScheduleAnyway</code>, Kubernetes gives a higher precedence to topologies that would help reduce the skew.</li></ul></li><li><code>minDomains</code>: the minimum number of eligible domains (e.g. availability zones or regions).</li><li><code>topologyKey</code>: the node label used to identify nodes used for this constraint. Any nodes that have this label are grouped into topology domains according to their values. For example, using <code>topology.kubernetes.io/zone</code> as a key creates domains based on the availability zones your hosts span.</li><li><code>whenUnsatisfiable</code>: how to handle pods that don’t satisfy the spread constraint. By default, it won’t be scheduled (<code>DoNotSchedule</code>). Setting this to <code>ScheduleAnyway</code> schedules the pod regardless, prioritizing nodes that minimize the <code>maxSkew</code>.</li><li><code>labelSelector</code>: the pod label used to find matching pods.</li><li><code>matchLabelKeys</code>: a list of pod label keys to use to calculate the spreading skew.</li><li><code>nodeAffinityPolicy</code>: determines how to treat each pod’s <code>nodeAffinity</code> and <code>nodeSelector</code> settings. <code>Honor</code> (the default) limits the topology calculation to these nodes, while <code>Ignore</code> uses all nodes. </li><li><code>nodeTaintsPolicy</code>: determines whether to include node taints in the topology calculation.</li></ul><p>Note that you can define only one <code>topologySpreadConstraint</code> for a given <code>topologyKey</code> and <code>whenUnsatisfiable</code> pair.</p><p>‍</p><h2>How to add a topology spread constraint to a Kubernetes manifest</h2><p>Imagine we have a Kubernetes cluster distributed across three availability zones: us-east-1a, us-east-1b, and us-west-2a. We also have a pod that we want to deploy and replicate for redundancy. We’ll start with the following manifest:</p><div class="w-embed"><div class="code-higlight-wrapper">
<div class="code-highlight-header"><div class="code-language-wrapper">
<div>YAML</div></div>
<div class="copy-icon-wrapper">
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<div class="code-highlight w-embed">
<pre class="language-yaml">
<code fs-copyclip-element="copy-this" class="language-yaml">
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
spec:
selector:
matchLabels:
app: nginx
replicas: 4
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.31.3
ports:
- containerPort: 80</code>
</pre>
</div>
</div></div><p>‍</p><p>If we deploy four replicas of the pod using a round-robin algorithm, we end up with one node with two pods and two nodes with one pod:</p><p>‍</p><figure style="max-width:704pxpx" class="w-richtext-align-fullwidth w-richtext-figure-type-image"><div><img alt="" src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7b72f84de133f41d6b4e35_37930b7b.png" loading="lazy"/></div><figcaption>Three nodes spanning three availability zones: two in us-east-1 and one in us-west-2. Two pods are in us-east-1a, one in us-east-1b, and one in us-west-2a.</figcaption></figure><p>‍</p><p>However, the Kubernetes scheduler might deploy two pods to two nodes, leaving one empty; or it might deploy three pods to us-east-1a and one to us-east-1b, which puts us at risk if the us-east region ever goes down. Or, in the worst case, it could deploy all four to one node and create a single point of failure.</p><p>‍</p><figure style="max-width:1432pxpx" class="w-richtext-align-fullwidth w-richtext-figure-type-image"><div><img alt="" src="https://cdn.prod.website-files.com/64a52fe92f1fc7debc3007b0/6a7b72f84de133f41d6b4e38_2d98338a.png" loading="lazy"/></div><figcaption>Different potential distributions of the deployment across all three nodes, from even (2-1-1) to extremely skewed (4-0-0).</figcaption></figure><p>‍</p><ol role="list"><li>Let’s first limit the pod imbalance by setting <code>maxSkew</code> to 1. This ensures that no single node has more than one additional replica of the pod than any other node.</li><li>Next, we’ll set the <code>topologyKey</code> to <code>topology.kubernetes.io/zone</code>, since we want to limit the spread by zone even if our zones span multiple regions.</li><li>We want Kubernetes to run the pod even if it can’t satisfy our topology constraints, so we’ll set <code>whenUnsatisfiable</code> to <code>ScheduleAnyway</code>.</li><li>We want to match all Nginx pods (in this deployment, anyway), so let’s add a <code>labelSelector</code> that matches <code>app: nginx</code>.</li></ol><p>Now, our manifest looks like this:</p><div class="w-embed"><div class="code-higlight-wrapper">
<div class="code-highlight-header"><div class="code-language-wrapper">
<div>YAML</div></div>
<div class="copy-icon-wrapper">
<div fs-copyclip-message="Copied!" fs-copyclip-element="click" class="copy-icon w-embed">
<svg xmlns="http://www.w3.org/2000/svg" width="1em" height="1em" viewBox="0 0 24 24" fill="none" stroke-linecap="round" stroke-linejoin="round" class="CK__Icon css-1ea9lxr"><g stroke="currentColor" fill-rule="evenodd" stroke-width="1.5"><path d="M10.9 8.7h9.9c1.2 0 2.2 1 2.2 2.2v9.9c0 1.2-1 2.2-2.2 2.2h-9.9c-1.2 0-2.2-1-2.2-2.2v-9.9c0-1.2 1-2.2 2.2-2.2z"></path><path d="M4.3 15.3H3.2c-1.2 0-2.2-1-2.2-2.2V3.2C1 2 2 1 3.2 1h9.9c1.2 0 2.2 1 2.2 2.2v1.1"></path></g></svg>
</div>
</div>
</div>
<div class="code-highlight w-embed">
<pre class="language-yaml">
<code fs-copyclip-element="copy-this" class="language-yaml">
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
spec:
selector:
matchLabels:
app: nginx
replicas: 4
template:
metadata:
labels:
app: nginx
spec:
topologySpreadConstraints:
- maxSkew: 1
topologyKey: topology.kubernetes.io/zone
whenUnsatisfiable: ScheduleAnyway
labelSelector:
matchLabels:
app: nginx
containers:
- name: nginx
image: nginx:1.31.3
ports:
- containerPort: 80</code>
</pre>
</div>
</div></div><p>‍</p><h2>How to find pods with missing topology spread constraints</h2><p>You can use the <code>kubectl</code> command-line tool to retrieve a list of pods, then use the <code>jq</code> command-line tool to filter pods that don’t have <code>topologySpreadConstraints</code> defined. For example:</p><div class="w-embed"><div class="code-higlight-wrapper">
<div class="code-highlight-header"><div class="code-language-wrapper">
<div>SHELL</div></div>
<div class="copy-icon-wrapper">
<div fs-copyclip-message="Copied!" fs-copyclip-element="click" class="copy-icon w-embed">
<svg xmlns="http://www.w3.org/2000/svg" width="1em" height="1em" viewBox="0 0 24 24" fill="none" stroke-linecap="round" stroke-linejoin="round" class="CK__Icon css-1ea9lxr"><g stroke="currentColor" fill-rule="evenodd" stroke-width="1.5"><path d="M10.9 8.7h9.9c1.2 0 2.2 1 2.2 2.2v9.9c0 1.2-1 2.2-2.2 2.2h-9.9c-1.2 0-2.2-1-2.2-2.2v-9.9c0-1.2 1-2.2 2.2-2.2z"></path><path d="M4.3 15.3H3.2c-1.2 0-2.2-1-2.2-2.2V3.2C1 2 2 1 3.2 1h9.9c1.2 0 2.2 1 2.2 2.2v1.1"></path></g></svg>
</div>
</div>
</div>
<div class="code-highlight w-embed">
<pre class="language-shell">
<code fs-copyclip-element="copy-this" class="language-shell">
kubectl get pods -o json | jq -r '.items[] | select(.spec.topologySpreadConstraints == null) | .metadata.name'</code>
</pre>
</div>
</div></div><p>‍</p><p>You can also use Gremlin’s built-in <a href="https://www.gremlin.com/docs/reliability-management-detected-risks#toc-topology-spread-constraints-absent">Detected Risks</a> feature to automatically scan your Kubernetes pods for missing topology spread constraints.</p><p>Once you’ve added your constraints, re-run this command to ensure your pods don’t appear in the output. If you’re using Gremlin, the “<a href="https://www.gremlin.com/docs/reliability-management-detected-risks#toc-topology-spread-constraints-absent">topology spread constraints absent</a>” risk status will automatically change from “at-risk” to “mitigated” and your service’s reliability score will increase.</p><p>‍</p><h2>Combining topology spread constraints, node affinity rules, and taints and tolerations</h2><p>As we already saw, topology spread constraints can interact with other Kubernetes features, particularly <a href="https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/#affinity-and-anti-affinity">node affinity rules</a> and <a href="https://kubernetes.io/docs/concepts/scheduling-eviction/taint-and-toleration/">taints and tolerations</a>. But there are subtle differences between these.</p><p>Affinity rules define the specific criteria for scheduling a pod on a node. For example, a pod running a large language model (LLM) might have an affinity rule that requires a node with a GPU. This way, you can combine affinity rules and topology spread constraints to limit the domain of nodes available to a pod. Just make sure you set <code>nodeAffinityPolicy: Honor</code> (the default).</p><p>Conversely, taints specify where <em>not</em> to schedule a pod unless it has a matching toleration. If a node’s GPU crashes due to a driver issue, you don’t want Kubernetes scheduling LLMs onto that node. Instead, you can apply a taint that prevents Kubernetes from scheduling pods on that node, while also migrating running pods onto new nodes. Like affinity rules, these work in tandem with topology spread constraints by limiting the size of the domain, as long as you set <code>nodeTaintsPolicy: Honor</code>.</p><p>‍</p><h2>Other Kubernetes risks to watch out for</h2><p>Topology spread constraints are just one piece of a resilient Kubernetes deployment. If you want to know how to protect yourself against other risks like missing liveness probes, unset resource requests, and improperly configured high-availability clusters, check out our comprehensive ebook, &quot;Kubernetes Reliability at Scale.&quot;</p><p>In the meantime, if you&#x27;d like a free report of your reliability risks in just a few minutes, you can sign up for a free 30-day Gremlin trial, or use Gremlin&#x27;s<a href="https://www.gremlin.com/docs/reliability-management-detected-risks#toc-topology-spread-constraints-absent"> Detected Risks</a> feature to automatically scan your existing Kubernetes pods for missing topology spread constraints.</p><p>‍</p></div><div class="full-width w-condition-invisible"><div class="w-dyn-list"><div class="empty-state w-dyn-empty"><div>No items found.</div></div></div></div><div class="categories-divider-line"></div><div class="blog-cta"><div class="cta-wrap w-condition-invisible"><div class="heading-l"><strong>Start your free trial</strong></div><p class="cta-wroa">Gremlin&#x27;s automated reliability platform empowers you to find and fix availability risks before they impact your users. 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