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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><h1 id="__docusaurus" class="postHeaderTitle">Clusters</h1></header><article><div><span><p><code>Cluster</code> allows you to group (or cluster) nodes in an isolated group.</p>
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<h2><a class="anchor" aria-hidden="true" id="basic"></a><a href="#basic" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Basic</h2>
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<p><code>Cluster</code> represents a local cluster context.</p>
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<p>You can create a cluster context using the <code>Cluster</code> class. You can also connect the nodes in a cluster to other nodes outside a cluster.</p>
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<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> diagrams <span class="hljs-keyword">import</span> Cluster, Diagram
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<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> ECS
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<span class="hljs-keyword">from</span> diagrams.aws.database <span class="hljs-keyword">import</span> RDS
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<span class="hljs-keyword">from</span> diagrams.aws.network <span class="hljs-keyword">import</span> Route53
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<span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Simple Web Service with DB Cluster"</span>, show=<span class="hljs-literal">False</span>):
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dns = Route53(<span class="hljs-string">"dns"</span>)
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web = ECS(<span class="hljs-string">"service"</span>)
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<span class="hljs-keyword">with</span> Cluster(<span class="hljs-string">"DB Cluster"</span>):
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db_primary = RDS(<span class="hljs-string">"primary"</span>)
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db_primary - [RDS(<span class="hljs-string">"replica1"</span>),
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RDS(<span class="hljs-string">"replica2"</span>)]
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dns >> web >> db_primary
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</code></pre>
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<p><img src="/img/simple_web_service_with_db_cluster_diagram.png" alt="simple web service with db cluster diagram"></p>
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<h2><a class="anchor" aria-hidden="true" id="nested-clusters"></a><a href="#nested-clusters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Nested Clusters</h2>
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<p>Nested clustering is also possible:</p>
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<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> diagrams <span class="hljs-keyword">import</span> Cluster, Diagram
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<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> ECS, EKS, Lambda
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<span class="hljs-keyword">from</span> diagrams.aws.database <span class="hljs-keyword">import</span> Redshift
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<span class="hljs-keyword">from</span> diagrams.aws.integration <span class="hljs-keyword">import</span> SQS
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<span class="hljs-keyword">from</span> diagrams.aws.storage <span class="hljs-keyword">import</span> S3
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<span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Event Processing"</span>, show=<span class="hljs-literal">False</span>):
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source = EKS(<span class="hljs-string">"k8s source"</span>)
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<span class="hljs-keyword">with</span> Cluster(<span class="hljs-string">"Event Flows"</span>):
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<span class="hljs-keyword">with</span> Cluster(<span class="hljs-string">"Event Workers"</span>):
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workers = [ECS(<span class="hljs-string">"worker1"</span>),
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ECS(<span class="hljs-string">"worker2"</span>),
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ECS(<span class="hljs-string">"worker3"</span>)]
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queue = SQS(<span class="hljs-string">"event queue"</span>)
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<span class="hljs-keyword">with</span> Cluster(<span class="hljs-string">"Processing"</span>):
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handlers = [Lambda(<span class="hljs-string">"proc1"</span>),
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Lambda(<span class="hljs-string">"proc2"</span>),
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Lambda(<span class="hljs-string">"proc3"</span>)]
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store = S3(<span class="hljs-string">"events store"</span>)
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dw = Redshift(<span class="hljs-string">"analytics"</span>)
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source >> workers >> queue >> handlers
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handlers >> store
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handlers >> dw
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</code></pre>
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<p><img src="/img/event_processing_diagram.png" alt="event processing diagram"></p>
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<blockquote>
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<p>There is no depth limit to nesting. Feel free to create nested clusters as deep as you want.</p>
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</blockquote>
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</span></div></article></div><div class="docLastUpdate"><em>Last updated on 4/13/2024</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/guides/node"><span class="arrow-prev">← </span><span>Nodes</span></a><a class="docs-next button" href="/docs/guides/edge"><span>Edges</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#nested-clusters">Nested Clusters</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/getting-started/installation">Getting Started</a><a href="/docs/guides/diagram">Guides</a><a href="/docs/nodes/aws">Nodes</a></div><div><h5>More</h5><iframe src="https://ghbtns.com/github-btn.html?user=mingrammer&repo=diagrams&type=star&count=true&size=large" frameBorder="0" scrolling="0" width="170" height="30" title="Star mingrammer/diagrams on GitHub"></iframe></div></section><section class="copyright">Copyright © 2025 mingrammer</section></footer></div></body></html> |
