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<li><a class="docs-link active" href="/docs/self-hosted/dependencies/">Database and cache</a></li>
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<li><a href="#database-1">Database</a></li>
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<li><a href="#redis-1">Redis</a></li>
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<li><a href="#1-install-postgres-if-you-dont-have-it-already">1. Install Postgres if you don’t have it already.</a></li>
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<li><a href="#2-create-new-user-for-running-mcaptcha">2. Create new user for running <code>mCaptcha</code></a></li>
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<li><a href="#3-create-new-user-in-postgres">3. Create new user in Postgres</a></li>
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<li><a href="#4-install-mcaptchacachehttpsgithubcommcaptchacache">4. Install <a href="https://github.com/mCaptcha/cache"><code>mCaptcha/cache</code></a></a></li>
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<h1>Database and cache</h1>
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<p class="lead">mCaptcha server requires dependencies like a Postgres database and a Redis cache</p>
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<h2 id="notes">Notes<a href="#notes" class="anchor" aria-hidden="true">#</a> </h2>
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<h3 id="database">Database<a href="#database" class="anchor" aria-hidden="true">#</a> </h3>
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<ul>
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<li>
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<p>Database migrations are baked into the server binary so don’t worry
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about them.</p>
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</li>
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<li>
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<p>When compiling from source, unset database configuration(comment out
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database configuration/ <code>unset</code> relevant environment variables).
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<code>mCaptcha</code> uses <a href="https://crates.io/crates/sqlx"><code>sqlx</code></a> database client
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library which checks SQL queries at compile time. So if you are starting
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with a fresh database without migrations applied, compilation will fail.</p>
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</li>
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</ul>
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<h3 id="redis">Redis<a href="#redis" class="anchor" aria-hidden="true">#</a> </h3>
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<ul>
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<li>
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<p>Redis is an optional dependency. Currently, the non-Redis configuration
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doesn’t persist CAPTCHA heat. So if there’s a systems failure, CAPTCHA
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heat will be reset and visitor count will start from 0. For small
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installations, this should post a problem as heat is short lived and is
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reset anyways at cool down period.</p>
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</li>
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<li>
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<p>mCaptcha uses a custom Redis module called
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<a href="https://github.com/mCaptcha/cache">cache</a> to overcome some of Redis'
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limitations.</p>
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</li>
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</ul>
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<h2 id="instructions">Instructions<a href="#instructions" class="anchor" aria-hidden="true">#</a> </h2>
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<p>Once again, there are two ways to go about this:</p>
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<ol>
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<li>Docker</li>
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<li>Bare metal</li>
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</ol>
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<h3 id="docker">Docker<a href="#docker" class="anchor" aria-hidden="true">#</a> </h3>
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<h3 id="database-1">Database<a href="#database-1" class="anchor" aria-hidden="true">#</a> </h3>
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<p>Download and run Postgres</p>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>docker create --name mcaptcha-postgres <span style="color:#f1fa8c">\
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</span></span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span><span style="color:#f1fa8c"></span> -e <span style="color:#8be9fd;font-style:italic">POSTGRES_PASSWORD</span><span style="color:#ff79c6">=</span><database-password> <span style="color:#f1fa8c">\
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</span></span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span><span style="color:#f1fa8c"></span> -p 5432:5432 <span style="color:#f1fa8c">\
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</span></span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4</span><span><span style="color:#f1fa8c"></span> postgres <span style="color:#ff79c6">&&</span> docker start mcaptcha-postgres
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</span></span></code></pre></div><h3 id="redis-1">Redis<a href="#redis-1" class="anchor" aria-hidden="true">#</a> </h3>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>docker create --name mcaptcha-cache <span style="color:#f1fa8c">\
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</span></span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span><span style="color:#f1fa8c"></span> -p 6379:6379 <span style="color:#f1fa8c">\
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</span></span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span><span style="color:#f1fa8c"></span> mcaptcha/cache <span style="color:#ff79c6">&&</span> docker start mcaptcha-cache
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</span></span></code></pre></div><p>See <a href="https://github.com/mCaptcha/cache">mCaptcha/cache</a> for more
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details.</p>
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<h3 id="1-install-postgres-if-you-dont-have-it-already">1. Install Postgres if you don’t have it already.<a href="#1-install-postgres-if-you-dont-have-it-already" class="anchor" aria-hidden="true">#</a> </h3>
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<p>For Debian based distributions:</p>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>sudo apt install postgres
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</span></span></code></pre></div><h3 id="2-create-new-user-for-running-mcaptcha">2. Create new user for running <code>mCaptcha</code><a href="#2-create-new-user-for-running-mcaptcha" class="anchor" aria-hidden="true">#</a> </h3>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>$ sudo useradd -b /srv -m -s /usr/bin/bash mcaptcha
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</span></span></code></pre></div><h3 id="3-create-new-user-in-postgres">3. Create new user in Postgres<a href="#3-create-new-user-in-postgres" class="anchor" aria-hidden="true">#</a> </h3>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>$ sudo -iu postgres <span style="color:#6272a4"># switch to `postgres` user</span>
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>$ psql
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span><span style="color:#8be9fd;font-style:italic">postgres</span><span style="color:#ff79c6">=</span><span style="color:#6272a4"># CREATE USER mcaptcha WITH PASSWORD 'my super long password and yes you need single quote';</span>
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</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4</span><span>$ createdb -O mcaptcha mcaptcha <span style="color:#6272a4"># create db 'mcaptcha' with 'mcaptcha' as owner</span>
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</span></span></code></pre></div><h3 id="4-install-mcaptchacachehttpsgithubcommcaptchacache">4. Install <a href="https://github.com/mCaptcha/cache"><code>mCaptcha/cache</code></a><a href="#4-install-mcaptchacachehttpsgithubcommcaptchacache" class="anchor" aria-hidden="true">#</a> </h3>
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<p>See <a href="https://github.com/mCaptcha/cache"><code>mCaptcha/cache</code></a> for more
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details.</p>
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<p class="edit-page"><a href="https://github.com/mCaptcha/website/blob/master/content/docs/self-hosted/dependencies.md"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-edit-2"><path d="M17 3a2.828 2.828 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z"></path></svg>Edit this page on GitHub</a></p>
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