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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Clusters · Diagrams</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Cluster allows you group (or clustering) the nodes in an isolated group."/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Clusters · Diagrams"/><meta property="og:type" content="website"/><meta property="og:url" content="https://diagrams.mingrammer.com/"/><meta property="og:description" content="Cluster allows you group (or clustering) the nodes in an isolated group."/><meta property="og:image" content="https://diagrams.mingrammer.com/img/diagrams.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://diagrams.mingrammer.com/img/diagrams.png"/><link rel="shortcut icon" href="/img/diagrams.ico"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script type="text/javascript" src="https://buttons.github.io/buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/diagrams.ico" alt="Diagrams"/><h2 class="headerTitleWithLogo">Diagrams</h2></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/installation" target="_self">Docs</a></li><li class="siteNavGroupActive"><a href="/docs/diagram" target="_self">Guides</a></li><li class=""><a href="https://github.com/mingrammer/diagrams" target="_self">GitHub</a></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="docsNavContainer" id="docsNav"><nav class="toc"><div class="toggleNav"><section class="navWrapper wrapper"><div class="navBreadcrumb wrapper"><div class="navToggle" id="navToggler"><div class="hamburger-menu"><div class="line1"></div><div class="line2"></div><div class="line3"></div></div></div><h2><i>›</i><span>Guides</span></h2><div class="tocToggler" id="tocToggler"><i class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle">Getting Started</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/installation">Installation</a></li><li class="navListItem"><a class="navItem" href="/docs/examples">Examples</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Guides</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/diagram">Diagrams</a></li><li class="navListItem"><a class="navItem" href="/docs/node">Nodes</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/cluster">Clusters</a></li></ul></div></div></section></div><script>
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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>Cluster allows you group (or clustering) the nodes in an isolated group.</p>
<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>
<p>Cluster represents a local cluster context.</p>
<p>You can create a cluster context with Cluster class. And you can also connect the nodes in a cluster to other nodes outside a cluster.</p>
<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> diagrams <span class="hljs-keyword">import</span> Cluster, Diagram
<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> ECS
<span class="hljs-keyword">from</span> diagrams.aws.database <span class="hljs-keyword">import</span> RDS
<span class="hljs-keyword">from</span> diagrams.aws.network <span class="hljs-keyword">import</span> Route53

<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>):
    dns = Route53(<span class="hljs-string">"dns"</span>)
    web = ECS(<span class="hljs-string">"service"</span>)

    <span class="hljs-keyword">with</span> Cluster(<span class="hljs-string">"DB Cluster"</span>):
        db_master = RDS(<span class="hljs-string">"master"</span>)
        db_master - [RDS(<span class="hljs-string">"slave1"</span>),
                     RDS(<span class="hljs-string">"slave2"</span>)]

    dns &gt;&gt; web &gt;&gt; db_master
</code></pre>
<p><img src="/img/simple_web_service_with_db_cluster_diagram.png" alt="simple web service with db cluster diagram"></p>
<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>
<p>Nested clustering is also possible.</p>
<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> diagrams <span class="hljs-keyword">import</span> Cluster, Diagram
<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> ECS, EKS, Lambda
<span class="hljs-keyword">from</span> diagrams.aws.database <span class="hljs-keyword">import</span> Redshift
<span class="hljs-keyword">from</span> diagrams.aws.integration <span class="hljs-keyword">import</span> SQS
<span class="hljs-keyword">from</span> diagrams.aws.storage <span class="hljs-keyword">import</span> S3

<span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Event Processing"</span>, show=<span class="hljs-literal">False</span>):
    source = EKS(<span class="hljs-string">"k8s source"</span>)

    <span class="hljs-keyword">with</span> Cluster(<span class="hljs-string">"Event Flows"</span>):
        <span class="hljs-keyword">with</span> Cluster(<span class="hljs-string">"Event Workers"</span>):
            workers = [ECS(<span class="hljs-string">"worker1"</span>),
                       ECS(<span class="hljs-string">"worker2"</span>),
                       ECS(<span class="hljs-string">"worker3"</span>)]

        queue = SQS(<span class="hljs-string">"event queue"</span>)

        <span class="hljs-keyword">with</span> Cluster(<span class="hljs-string">"Processing"</span>):
            handlers = [Lambda(<span class="hljs-string">"proc1"</span>),
                        Lambda(<span class="hljs-string">"proc2"</span>),
                        Lambda(<span class="hljs-string">"proc3"</span>)]

    store = S3(<span class="hljs-string">"events store"</span>)
    dw = Redshift(<span class="hljs-string">"analytics"</span>)

    source &gt;&gt; workers &gt;&gt; queue &gt;&gt; handlers
    handlers &gt;&gt; store
    handlers &gt;&gt; dw
</code></pre>
<p><img src="/img/event_processing_diagram.png" alt="event processing diagram"></p>
<blockquote>
<p>There is no depth limit of nesting. Feel free to create nested clusters as deep as you want.</p>
</blockquote>
</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/node"><span class="arrow-prev">← </span><span>Nodes</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/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>