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Getting Started with Keycloak: Running Your First Instance - DEV Community
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</div> </aside> <main id="main-content" class="crayons-layout__content grid gap-4"> <div class="article-wrapper"> <article class="crayons-card crayons-article mb-4" id="article-show-container" data-article-id="2287133" data-article-slug="getting-started-with-keycloak-running-your-first-instance-18fd" data-author-id="2882165" data-author-name="Webbies" data-author-username="webbies" data-co-author-ids="" data-path="/webbies/getting-started-with-keycloak-running-your-first-instance-18fd" data-pin-path="/stories/feed/pinned_article" data-pinned-article-id="" data-published="true" data-scheduled="false" lang=en > <header class="crayons-article__header" id="main-title"> <div class="crayons-article__header__meta"> <div class="flex s:items-start flex-col s:flex-row"> <div id="action-space" class="crayons-article__actions mb-4 s:mb-0 s:order-last"></div> <div class="flex flex-1 mb-5 items-start"> <div class="relative"> <a href="/webbies"><img class="radius-full align-middle" src="https://media2.dev.to/dynamic/image/width=50,height=50,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F2882165%2F12667327-bf71-492f-b231-576b498b2f96.png" width="40" height="40" alt="Webbies" /></a> </div> <div class="pl-3 flex-1"> <a href="/webbies" class="crayons-link fw-bold">Webbies</a> <p class="fs-xs color-base-60"> Posted on <time datetime="2025-02-19T06:35:20Z" class="date-no-year">Feb 19</time> </p> </div> </div> </div> <h1 class=" fs-3xl m:fs-4xl l:fs-5xl fw-bold s:fw-heavy lh-tight mb-2 medium"> Getting Started with Keycloak: Running Your First Instance </h1> <div class="spec__tags flex flex-wrap"> <a class="crayons-tag " style=" --tag-bg: rgba(59, 73, 223, 0.10); --tag-prefix: #3b49df; --tag-bg-hover: rgba(59, 73, 223, 0.10); --tag-prefix-hover: #3b49df; " href="/t/keycloak"><span class="crayons-tag__prefix">#</span>keycloak</a> <a class="crayons-tag " style=" --tag-bg: rgba(29, 99, 237, 0.10); --tag-prefix: #1D63ED; --tag-bg-hover: rgba(29, 99, 237, 0.10); --tag-prefix-hover: #1D63ED; " href="/t/docker"><span class="crayons-tag__prefix">#</span>docker</a> <a class="crayons-tag " style=" --tag-bg: rgba(59, 73, 223, 0.10); --tag-prefix: #3b49df; --tag-bg-hover: rgba(59, 73, 223, 0.10); --tag-prefix-hover: #3b49df; " href="/t/springboot"><span class="crayons-tag__prefix">#</span>springboot</a> <a class="crayons-tag " style=" --tag-bg: rgba(169, 2, 42, 0.10); --tag-prefix: #A9022A; --tag-bg-hover: rgba(169, 2, 42, 0.10); --tag-prefix-hover: #A9022A; " href="/t/angular"><span class="crayons-tag__prefix">#</span>angular</a> </div> </div> </header> <div class="crayons-article__main "> <div class="crayons-article__body text-styles spec__body" data-article-id="2287133" id="article-body"> <p>As developers, we often face the challenge of implementing secure authentication and authorization in our applications. Keycloak is an open-source Identity and Access Management solution that can significantly simplify this process. In this first part of our three-part series, we'll set up a Keycloak instance using Docker.<br> Prerequisites</p> <p>Docker installed on your machine<br> Basic understanding of authentication concepts<br> Terminal/Command Prompt access</p> <p>Setting Up Keycloak with Docker</p> <p>First, let's create a docker-compose.yml file:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight yaml"><code><span class="na">version</span><span class="pi">:</span> <span class="s1">'</span><span class="s">3'</span> <span class="na">services</span><span class="pi">:</span> <span class="na">keycloak</span><span class="pi">:</span> <span class="na">image</span><span class="pi">:</span> <span class="s">quay.io/keycloak/keycloak:22.0.1</span> <span class="na">environment</span><span class="pi">:</span> <span class="pi">-</span> <span class="s">KEYCLOAK_ADMIN=admin</span> <span class="pi">-</span> <span class="s">KEYCLOAK_ADMIN_PASSWORD=admin</span> <span class="na">ports</span><span class="pi">:</span> <span class="pi">-</span> <span class="s2">"</span><span class="s">8080:8080"</span> <span class="na">command</span><span class="pi">:</span> <span class="pi">-</span> <span class="s">start-dev</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-on"><title>Enter fullscreen mode</title> <path d="M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-off"><title>Exit fullscreen mode</title> <path d="M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z"></path> </svg> </div> </div> </div> <p>Start the container:</p> <p><code>docker-compose up -d</code></p> <p>Your Keycloak instance will be available at <code>http://localhost:8080</code>.<br> Configuring Keycloak</p> <p>Navigate to <code>http://localhost:8080/admin</code> and log in with:</p> <p>Username: <code>admin</code><br> Password: <code>admin</code></p> <p>Create a new realm:</p> <blockquote> <p>Click <code>Create Realm</code><br> Name it <code>demo-realm</code><br> Click <code>Create</code></p> </blockquote> <p>Create a client for our applications:</p> <blockquote> <p>Go to <code>Clients</code> → <code>Create client</code><br> Client ID: <code>demo-app</code><br> Client Protocol: <code>openid-connect</code><br> Click <code>Next</code><br> Enable <code>Client authentication</code><br> Click <code>Save</code></p> </blockquote> <p>Configure the client:</p> <p>Valid redirect URIs:</p> <p><code>http://localhost:8081/* (for Spring Boot)<br> http://localhost:4200/* (for Angular)</code></p> <p>Web Origins:</p> <p><code>http://localhost:8081<br> http://localhost:4200</code></p> <blockquote> <p>Click <code>Save</code></p> </blockquote> <p>Create a test user:</p> <blockquote> <p>Go to <code>Users</code> → <code>Add user</code><br> Username: <code>testuser</code><br> Email: <code>testuser@example.com</code><br> Click <code>Create</code><br> Go to <code>Credentials</code> tab<br> Set password: <code>password123</code><br> Disable <code>Temporary</code><br> Click <code>Set Password</code></p> </blockquote> <p>Important Configuration Values<br> Save these values for the next parts:<br> plaintextCopyRealm: <code>demo-realm</code><br> Client ID: <code>demo-app</code><br> Client Secret: (find in Clients → demo-app → Credentials tab)<br> Auth URL: <code>http://localhost:8080/realms/demo-realm</code><br> Testing the Setup</p> <p>Visit <code>http://localhost:8080/realms/demo-realm/.well-known/openid-configuration</code><br> You should see a JSON document with endpoint configurations</p> <p>In the next part, we'll integrate this Keycloak 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