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markdown"><header><h1>Getting started with Compose</h1></header>
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<p><a href="https://www.compose-spec.io/" target="_blank" rel="noopener noreferrer">Compose is a specification</a> for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application’s services, networks, and volumes. This allows you to capture in a single file the entire configuration necessary to run a set of interconnected containers as an application. For example, if you have an application that requires a web server, a database, and a caching service, you can define these components and their relationships in your Compose file.</p>
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<p>To use the Compose YAML, you can leverage a specification implementation, such as <a href="https://docs.podman.io/en/latest/markdown/podman-compose.1.html" target="_blank" rel="noopener noreferrer"><code>podman compose</code></a> and <a href="https://github.com/docker/compose" target="_blank" rel="noopener noreferrer"><code>docker compose</code></a>.</p>
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<p>This tutorial covers the following end-to-end tasks required to use a multi-container Compose application within Podman Desktop:</p>
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<ul>
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<li><a href="/tutorial/getting-started-with-compose#download-and-run-the-example-application">Download and run the example application</a> using <code>podman compose up</code>.</li>
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<li><a href="/tutorial/getting-started-with-compose#viewing-the-guestbook-application">View the guestbook web application</a>.</li>
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<li><a href="/tutorial/getting-started-with-compose#viewing-and-modifying-the-database">View and modify the database</a> to check the guestbook web application is synchronized and running correctly.</li>
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<li><a href="/tutorial/getting-started-with-compose#scaling-more-replicas">Scale database replicas</a>.</li>
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</ul>
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<h2 class="anchor anchorWithStickyNavbar_JmGV" id="before-you-begin">Before you begin<a href="#before-you-begin" class="hash-link" aria-label="Direct link to Before you begin" title="Direct link to Before you begin"></a></h2>
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<p>If you do not have Compose installed, you can follow the complete onboarding process to install it system wide:</p>
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<ol>
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<li>
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<p>Install the Compose extension from the catalog. For more details, see <a href="https://podman-desktop.io/docs/extensions/install" target="_blank" rel="noopener noreferrer">Installing a Podman Desktop extension</a>.</p>
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</li>
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<li>
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<p>Set up Compose and complete the onboarding process to configure it system-wide.
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<img decoding="async" loading="lazy" alt="Onboarding process" src="/assets/images/onboarding-59e0db2497389dec25a3b6bb8844a893.png" width="1496" height="1206" class="img_SS3x"></p>
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</li>
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<li>
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<p>Check that you are able to run <code>podman compose</code>:</p>
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<div class="language-sh codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-sh codeBlock_RMoD thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#F8F8F2"><span class="token function" style="color:rgb(80, 250, 123)">podman</span><span class="token plain"> compose</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Run compose workloads via an external provider such as </span><span class="token function" style="color:rgb(80, 250, 123)">docker-compose</span><span class="token plain"> or </span><span class="token function" style="color:rgb(80, 250, 123)">podman-compose</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Description:</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> This </span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">command</span><span class="token plain"> is a thin wrapper around an external compose provider such as </span><span class="token function" style="color:rgb(80, 250, 123)">docker-compose</span><span class="token plain"> or podman-compose. This means that </span><span class="token function" style="color:rgb(80, 250, 123)">podman</span><span class="token plain"> compose is executing another tool that implements the compose functionality but sets up the environment </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">in</span><span class="token plain"> a way to </span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">let</span><span class="token plain"> the compose provider communicate transparently with the </span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">local</span><span class="token plain"> Podman socket. The specified options as well the </span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">command</span><span class="token plain"> and argument are passed directly to the compose provider.</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">..</span><span class="token plain">.</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><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_L0B6"><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>
|
||
</li>
|
||
</ol>
|
||
<div class="theme-admonition theme-admonition-note admonition_WCGJ alert alert--secondary"><div class="admonitionHeading_GCBg"><span class="admonitionIcon_L39b"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</div><div class="admonitionContent_pbrs"><p>If Compose is already installed, you have the option to upgrade or downgrade its version by navigating to the <strong>Settings > CLI Tools</strong> page.</p></div></div>
|
||
<h2 class="anchor anchorWithStickyNavbar_JmGV" id="download-and-run-the-example-application">Download and run the example application<a href="#download-and-run-the-example-application" class="hash-link" aria-label="Direct link to Download and run the example application" title="Direct link to Download and run the example application"></a></h2>
|
||
<p>Our example application is located at <a href="https://github.com/redhat-developer/podman-desktop-demo" target="_blank" rel="noopener noreferrer">github.com/redhat-developer/podman-desktop-demo</a>.</p>
|
||
<ol>
|
||
<li>
|
||
<p>Run <code>git clone</code> to build the Go binary web application:</p>
|
||
<div class="language-sh codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-sh codeBlock_RMoD thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#F8F8F2"><span class="token function" style="color:rgb(80, 250, 123)">git</span><span class="token plain"> clone https://github.com/redhat-developer/podman-desktop-demo</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">cd</span><span class="token plain"> podman-desktop-demo/guestbook-compose</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><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_L0B6"><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>
|
||
</li>
|
||
<li>
|
||
<p>Run <code>podman compose up -d</code> to start the application:</p>
|
||
<div class="language-sh codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-sh codeBlock_RMoD thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#F8F8F2"><span class="token function" style="color:rgb(80, 250, 123)">podman</span><span class="token plain"> compose up </span><span class="token parameter variable" style="color:rgb(189, 147, 249);font-style:italic">-d</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token operator">>></span><span class="token operator">>></span><span class="token plain"> Executing external compose provider </span><span class="token string" style="color:rgb(255, 121, 198)">"/usr/local/bin/docker-compose"</span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">.</span><span class="token plain"> Please refer to the documentation </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">for</span><span class="token plain"> details. </span><span class="token operator"><<<</span><span class="token operator"><</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">+</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> Running </span><span class="token number">3</span><span class="token plain">/3</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">✔ Container redis-replica Started </span><span class="token number">0</span><span class="token plain">.0s</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">✔ Container web Started </span><span class="token number">0</span><span class="token plain">.0s</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">✔ Container redis-leader Started </span><span class="token number">0</span><span class="token plain">.0s</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><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_L0B6"><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>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorWithStickyNavbar_JmGV" id="viewing-the-guestbook-application">Viewing the guestbook application<a href="#viewing-the-guestbook-application" class="hash-link" aria-label="Direct link to Viewing the guestbook application" title="Direct link to Viewing the guestbook application"></a></h2>
|
||
<p>Within Podman Desktop, you can now see that all three containers are up and operational.</p>
|
||
<ol>
|
||
<li>
|
||
<p>Click the "Open Browser" button to view the web application:
|
||
<img decoding="async" loading="lazy" alt="Open browser" src="/assets/images/openbrowser-9dda9ceaa832418fc532135f5921ccf2.png" width="2850" height="828" class="img_SS3x"></p>
|
||
</li>
|
||
<li>
|
||
<p>Within the Guestbook web application, you can:</p>
|
||
<ul>
|
||
<li>
|
||
<p>"Sign" the guestbook, which will write to the Redis leader and synchronize to the replicas.</p>
|
||
</li>
|
||
<li>
|
||
<p>"Read" from the guestbook, which will read from the pool of Redis replicas. This allows for readability even if the Redis leader is unavailable.</p>
|
||
</li>
|
||
<li>
|
||
<p><code>/env</code>: View the container's environment variables.</p>
|
||
</li>
|
||
<li>
|
||
<p><code>/info</code>: View information about the Redis cluster.</p>
|
||
<p><img decoding="async" loading="lazy" alt="Guestbook application" src="/assets/images/helloworld-516adc89ef8a509fb5ce998d3b0ea94b.png" width="949" height="653" class="img_SS3x"></p>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorWithStickyNavbar_JmGV" id="viewing-and-modifying-the-database">Viewing and modifying the database<a href="#viewing-and-modifying-the-database" class="hash-link" aria-label="Direct link to Viewing and modifying the database" title="Direct link to Viewing and modifying the database"></a></h2>
|
||
<p>Using Podman Desktop, you can also access the container's terminal directly from the GUI and modify the database.</p>
|
||
<ol>
|
||
<li>
|
||
<p>Click <strong>Open Terminal</strong> to access the <code>redis-leader</code> terminal:</p>
|
||
<p><img decoding="async" loading="lazy" alt="Open terminal" src="/assets/images/openterminal-32b76b2c26213e8cd4139cf9783b456c.png" width="2408" height="1070" class="img_SS3x"></p>
|
||
</li>
|
||
<li>
|
||
<p>Modify the database as if you are doing database administration:</p>
|
||
<ol>
|
||
<li>
|
||
<p>Run <code>redis-cli</code> within the container to access the Redis database.</p>
|
||
</li>
|
||
<li>
|
||
<p>Type <code>LPUSH guestbook "Hello World!"</code> and you will see your web application update in real-time.</p>
|
||
</li>
|
||
<li>
|
||
<p>Type <code>DEL guestbook</code> and you will see that your database drops the <code>guestbook</code> key and clears the database.</p>
|
||
<p><img decoding="async" loading="lazy" alt="Redis CLI" src="/assets/images/redis-cli-45bdb3866b5813d2cc9009e5474f0117.png" width="1652" height="534" class="img_SS3x"></p>
|
||
<p>Changes will reflect in real-time on the guestbook.</p>
|
||
</li>
|
||
</ol>
|
||
</li>
|
||
</ol>
|
||
<p>You can further modify the database and see the changes propagate to the Redis replicas. For example, view the logs of the <code>redis-replica</code>, and you will notice that there are periodic database synchronizations as well as reads to the database:</p>
|
||
<p><img decoding="async" loading="lazy" alt="Redis replica logs" src="/assets/images/redisreplica-c911ec791d20083c803f63c6d86f4b70.png" width="1680" height="1148" class="img_SS3x"></p>
|
||
<h3 class="anchor anchorWithStickyNavbar_JmGV" id="how-does-it-work">How does it work?<a href="#how-does-it-work" class="hash-link" aria-label="Direct link to How does it work?" title="Direct link to How does it work?"></a></h3>
|
||
<p>A quick overview of how the architecture works in this multi-container scenario:</p>
|
||
<ul>
|
||
<li>Within the Guestbook application, it looks for a database with the names <code>redis-leader</code> and <code>redis-replica</code> on port <code>6379</code>.</li>
|
||
<li>Because it is a Compose application, the containers are connected on the same network. This means that a neighboring container can be network-accessible simply by its container name.</li>
|
||
</ul>
|
||
<p>There is a set of environment variables that the web application can modify in the Compose application:</p>
|
||
<ul>
|
||
<li><code>REDIS_LEADER</code>: The default is <code>redis-leader</code>.</li>
|
||
<li><code>REDIS_REPLICAS</code>: The default is <code>redis-replica</code>. It can be comma-separated, such as <code>redis-replica-1,redis-replica-2</code>.</li>
|
||
<li><code>REDIS_PORT</code>: The default is <code>6379</code>.</li>
|
||
<li><code>SERVER_PORT</code>: The default is <code>8080</code>.</li>
|
||
</ul>
|
||
<h2 class="anchor anchorWithStickyNavbar_JmGV" id="scaling-more-replicas">Scaling more replicas<a href="#scaling-more-replicas" class="hash-link" aria-label="Direct link to Scaling more replicas" title="Direct link to Scaling more replicas"></a></h2>
|
||
<p>Want to scale more replicas? This can be achieved by adding an environment variable to your <code>compose.yaml</code> and duplicating your <code>redis-replica</code> entry.</p>
|
||
<ol>
|
||
<li>
|
||
<p>Modify your <code>compose.yaml</code> as follows:</p>
|
||
<div class="language-yaml codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-yaml codeBlock_RMoD thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#F8F8F2"><span class="token key atrule">services</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">redis-leader</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">container_name</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">leader</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">image</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain">latest</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">ports</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'6379'</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">redis-replica</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">container_name</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">replica</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">image</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain">latest</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">ports</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'6379'</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">command</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">server </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">replicaof redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">leader 6379</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">redis-replica-2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">container_name</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">replica</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token number">2</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">image</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain">latest</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">ports</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'6379'</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">command</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">server </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">replicaof redis</span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain">leader 6379</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">web</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">container_name</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> web</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">build</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> ./web</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">ports</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'8080:8080'</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><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_L0B6"><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>
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</li>
|
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<li>
|
||
<p>Run <code>podman compose up -d</code> again to ensure the new container has been added and the new environment variable has propagated:</p>
|
||
<div class="language-sh codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-sh codeBlock_RMoD thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#F8F8F2"><span class="token function" style="color:rgb(80, 250, 123)">podman</span><span class="token plain"> compose up </span><span class="token parameter variable" style="color:rgb(189, 147, 249);font-style:italic">-d</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token operator">>></span><span class="token operator">>></span><span class="token plain"> Executing external compose provider </span><span class="token string" style="color:rgb(255, 121, 198)">"/usr/local/bin/docker-compose"</span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">.</span><span class="token plain"> Please refer to the documentation </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">for</span><span class="token plain"> details. </span><span class="token operator"><<<</span><span class="token operator"><</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">+</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> Running </span><span class="token number">4</span><span class="token plain">/4</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">✔ Container redis-replica-2 Started </span><span class="token number">0</span><span class="token plain">.0s</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">✔ Container redis-leader Running </span><span class="token number">0</span><span class="token plain">.0s</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">✔ Container web Started </span><span class="token number">0</span><span class="token plain">.0s</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">✔ Container redis-replica Running </span><span class="token number">0</span><span class="token plain">.0s</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><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_L0B6"><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>
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</li>
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</ol></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-tags-row"><div class="col"><b>Tags:</b><ul class="tags_Ow0B padding--none margin-left--sm"><li class="tag_DFxh"><a class="tag_otG2 tagRegular_s0E1" href="/tutorial/tags/podman-desktop">podman-desktop</a></li><li class="tag_DFxh"><a class="tag_otG2 tagRegular_s0E1" href="/tutorial/tags/working-with-compose">working-with-compose</a></li></ul></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/tutorial/creating-an-extension"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Creating an extension</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/tutorial/testcontainers-with-podman"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Testcontainers with Podman</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_XG6w thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#before-you-begin" class="table-of-contents__link toc-highlight">Before you begin</a></li><li><a href="#download-and-run-the-example-application" class="table-of-contents__link toc-highlight">Download and run the example application</a></li><li><a href="#viewing-the-guestbook-application" class="table-of-contents__link toc-highlight">Viewing the guestbook application</a></li><li><a href="#viewing-and-modifying-the-database" class="table-of-contents__link toc-highlight">Viewing and modifying the database</a><ul><li><a href="#how-does-it-work" class="table-of-contents__link toc-highlight">How does it work?</a></li></ul></li><li><a href="#scaling-more-replicas" class="table-of-contents__link toc-highlight">Scaling more replicas</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Documentation</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs/installation">Installing Podman Desktop</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/migrating-from-docker">Migrating from Docker</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/kubernetes">Working with Kubernetes</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/troubleshooting">Troubleshooting</a></li></ul></div><div class="col footer__col"><div class="footer__title">Links</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/podman-desktop/podman-desktop" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPrP"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://discord.com/invite/x5GzFF6QH4" target="_blank" rel="noopener noreferrer" class="footer__link-item">Chat (bridged): #podman-desktop on Discord<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPrP"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://github.com/podman-desktop/podman-desktop#communication" target="_blank" rel="noopener noreferrer" class="footer__link-item">Other ways to Communicate<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPrP"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://github.com/orgs/podman-desktop/projects/4/views/3" target="_blank" rel="noopener noreferrer" class="footer__link-item">Current Sprint<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPrP"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">
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