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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">Nodes</h1></header><article><div><span><p><code>Node</code> is an object representing a node or system component.</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>Node</code> is an abstract concept that represents a single system component object.</p>
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<p>A node object consists of three parts: <strong>provider</strong>, <strong>resource type</strong> and <strong>name</strong>. You may already have seen each part in the previous example.</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> Diagram
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<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> EC2
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<span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Simple Diagram"</span>):
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EC2(<span class="hljs-string">"web"</span>)
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</code></pre>
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<p>In the example above, the <code>EC2</code> is a node of resource type <code>compute</code> which is provided by the <code>aws</code> provider.</p>
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<p>You can use other node objects in a similar manner:</p>
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<pre><code class="hljs css language-python"><span class="hljs-comment"># aws resources</span>
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<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> ECS, Lambda
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<span class="hljs-keyword">from</span> diagrams.aws.database <span class="hljs-keyword">import</span> RDS, ElastiCache
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<span class="hljs-keyword">from</span> diagrams.aws.network <span class="hljs-keyword">import</span> ELB, Route53, VPC
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...
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<span class="hljs-comment"># azure resources</span>
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<span class="hljs-keyword">from</span> diagrams.azure.compute <span class="hljs-keyword">import</span> FunctionApps
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<span class="hljs-keyword">from</span> diagrams.azure.storage <span class="hljs-keyword">import</span> BlobStorage
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...
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<span class="hljs-comment"># alibaba cloud resources</span>
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<span class="hljs-keyword">from</span> diagrams.alibabacloud.compute <span class="hljs-keyword">import</span> ECS
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<span class="hljs-keyword">from</span> diagrams.alibabacloud.storage <span class="hljs-keyword">import</span> ObjectTableStore
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...
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<span class="hljs-comment"># gcp resources</span>
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<span class="hljs-keyword">from</span> diagrams.gcp.compute <span class="hljs-keyword">import</span> AppEngine, GKE
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<span class="hljs-keyword">from</span> diagrams.gcp.ml <span class="hljs-keyword">import</span> AutoML
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...
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<span class="hljs-comment"># k8s resources</span>
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<span class="hljs-keyword">from</span> diagrams.k8s.compute <span class="hljs-keyword">import</span> Pod, StatefulSet
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<span class="hljs-keyword">from</span> diagrams.k8s.network <span class="hljs-keyword">import</span> Service
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<span class="hljs-keyword">from</span> diagrams.k8s.storage <span class="hljs-keyword">import</span> PV, PVC, StorageClass
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...
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<span class="hljs-comment"># oracle resources</span>
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<span class="hljs-keyword">from</span> diagrams.oci.compute <span class="hljs-keyword">import</span> VirtualMachine, Container
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<span class="hljs-keyword">from</span> diagrams.oci.network <span class="hljs-keyword">import</span> Firewall
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<span class="hljs-keyword">from</span> diagrams.oci.storage <span class="hljs-keyword">import</span> FileStorage, StorageGateway
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</code></pre>
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<p>You can find lists of all available nodes for each provider in the sidebar on the left.</p>
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<p>For example, <a href="https://diagrams.mingrammer.com/docs/nodes/aws">here</a> is the list of all available AWS nodes.</p>
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<h2><a class="anchor" aria-hidden="true" id="data-flow"></a><a href="#data-flow" 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>Data Flow</h2>
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<p>You can represent data flow by connecting the nodes with the operators <code>>></code>, <code><<</code>, and <code>-</code>.</p>
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<ul>
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<li><strong>>></strong> connects nodes in left to right direction.</li>
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<li><strong><<</strong> connects nodes in right to left direction.</li>
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<li><strong>-</strong> connects nodes in no direction. Undirected.</li>
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</ul>
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<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> diagrams <span class="hljs-keyword">import</span> Diagram
|
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<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> EC2
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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> ELB
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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">"Web Services"</span>, show=<span class="hljs-literal">False</span>):
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ELB(<span class="hljs-string">"lb"</span>) >> EC2(<span class="hljs-string">"web"</span>) >> RDS(<span class="hljs-string">"userdb"</span>) >> S3(<span class="hljs-string">"store"</span>)
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ELB(<span class="hljs-string">"lb"</span>) >> EC2(<span class="hljs-string">"web"</span>) >> RDS(<span class="hljs-string">"userdb"</span>) << EC2(<span class="hljs-string">"stat"</span>)
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(ELB(<span class="hljs-string">"lb"</span>) >> EC2(<span class="hljs-string">"web"</span>)) - EC2(<span class="hljs-string">"web"</span>) >> RDS(<span class="hljs-string">"userdb"</span>)
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</code></pre>
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<blockquote>
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<p>Be careful when using <code>-</code> and any shift operators together. It can cause unexpected results due to Python's operator precedence, so you might have to use parentheses.</p>
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</blockquote>
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<p><img src="/img/web_services_diagram.png" alt="web services diagram"></p>
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<blockquote>
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<p>The order of rendered diagrams is the reverse of the declaration order.</p>
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</blockquote>
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<p>You can change the data flow direction with the <code>direction</code> parameter. The default is <strong>LR</strong>.</p>
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<blockquote>
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<p>Allowed values are: TB, BT, LR, and RL</p>
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</blockquote>
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<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> diagrams <span class="hljs-keyword">import</span> Diagram
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<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> EC2
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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> ELB
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<span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Workers"</span>, show=<span class="hljs-literal">False</span>, direction=<span class="hljs-string">"TB"</span>):
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lb = ELB(<span class="hljs-string">"lb"</span>)
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db = RDS(<span class="hljs-string">"events"</span>)
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lb >> EC2(<span class="hljs-string">"worker1"</span>) >> db
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lb >> EC2(<span class="hljs-string">"worker2"</span>) >> db
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lb >> EC2(<span class="hljs-string">"worker3"</span>) >> db
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lb >> EC2(<span class="hljs-string">"worker4"</span>) >> db
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lb >> EC2(<span class="hljs-string">"worker5"</span>) >> db
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</code></pre>
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<p><img src="/img/workers_diagram.png" alt="workers diagram"></p>
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<h2><a class="anchor" aria-hidden="true" id="group-data-flow"></a><a href="#group-data-flow" 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>Group Data Flow</h2>
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<p>The above worker example has too many redundant flows. To avoid this, you can group nodes into a list so that all nodes are connected to other nodes at once:</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> Diagram
|
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|
<span class="hljs-keyword">from</span> diagrams.aws.compute <span class="hljs-keyword">import</span> EC2
|
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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> ELB
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<span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Grouped Workers"</span>, show=<span class="hljs-literal">False</span>, direction=<span class="hljs-string">"TB"</span>):
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ELB(<span class="hljs-string">"lb"</span>) >> [EC2(<span class="hljs-string">"worker1"</span>),
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EC2(<span class="hljs-string">"worker2"</span>),
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EC2(<span class="hljs-string">"worker3"</span>),
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EC2(<span class="hljs-string">"worker4"</span>),
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EC2(<span class="hljs-string">"worker5"</span>)] >> RDS(<span class="hljs-string">"events"</span>)
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</code></pre>
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<p><img src="/img/grouped_workers_diagram.png" alt="grouped workers diagram"></p>
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<blockquote>
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<p>You can't connect two <strong>lists</strong> directly because shift/arithmetic operations between lists are not allowed in Python.</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/diagram"><span class="arrow-prev">← </span><span>Diagrams</span></a><a class="docs-next button" href="/docs/guides/cluster"><span>Clusters</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="#data-flow">Data Flow</a></li><li><a href="#group-data-flow">Group Data Flow</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> |
