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<label class="menu-icon d-md-none" for=menu-btn><span class=navicon></span></label><a class="navbar-brand order-1 order-md-0 me-auto" href=/>mCaptcha</a>
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<span class=toggle-dark><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-moon"><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg></span><span class=toggle-light><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-sun"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg></span></button><ul class="navbar-nav social-nav order-3 order-md-5"><li class=nav-item><a class=nav-link href=https://github.com/mCaptcha><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-github"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37.0 00-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44.0 0020 4.77 5.07 5.07.0 0019.91 1S18.73.65 16 2.48a13.38 13.38.0 00-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07.0 005 4.77 5.44 5.44.0 003.5 8.55c0 5.42 3.3 6.61 6.44 7A3.37 3.37.0 009 18.13V22"/></svg><span class="ms-2 visually-hidden">GitHub</span></a></li></ul><div class="collapse navbar-collapse order-4 order-md-1"><ul class="navbar-nav main-nav me-auto order-5 order-md-2"><li class=nav-item><a class=nav-link href=/blog/>Blog</a></li><li class=nav-item><a class=nav-link href=/community/>Community</a></li><li class=nav-item><a class=nav-link href=/contact/>Contact</a></li><li class=nav-item><a class=nav-link href=/about/>About</a></li><li class="nav-item active"><a class=nav-link href=/docs/introduction/installing-captcha/>Docs</a></li></ul><div class="break order-6 d-md-none"></div><form class="navbar-form flex-grow-1 order-7 order-md-3"><input id=userinput class="form-control is-search" type=search placeholder="Search docs..." aria-label="Search docs..." autocomplete=off><div id=suggestions class="shadow bg-white rounded"></div></form></div></div></header><div class="wrap container" role=document><div class=content><div class="row flex-xl-nowrap"><div class="col-lg-5 col-xl-4 docs-sidebar"><nav class=docs-links aria-label="Main navigation"><h3>Introduction</h3><ul class=list-unstyled><li><a class=docs-link href=/docs/introduction/installing-captcha/>Installing mCaptcha on your website</a></li><li><a class=docs-link href=/docs/introduction/configuring-difficulty-factor/>Configuring Difficulty Factor</a></li></ul><h3>Terminology</h3><ul class=list-unstyled><li><a class=docs-link href=/docs/terminology/access-token/>Access token</a></li><li><a class=docs-link href=/docs/terminology/cooldown-period/>Cooldown Period</a></li><li><a class=docs-link href=/docs/terminology/difficulty-factor/>Difficulty Factor</a></li><li><a class=docs-link href=/docs/terminology/sitekey/>Site key</a></li><li><a class=docs-link href=/docs/terminology/visitor-threshold/>Visitor Threshold</a></li></ul><h3>Self-Hosted</h3><ul class=list-unstyled><li><a class=docs-link href=/docs/self-hosted/getting-started/>Getting started</a></li><li><a class=docs-link href=/docs/self-hosted/bare-metal/>Deploy bare metal</a></li><li><a class=docs-link href=/docs/self-hosted/docker/>Using Docker</a></li><li><a class="docs-link active" href=/docs/self-hosted/dependencies/>Database and cache</a></li></ul><h3>API</h3><ul class=list-unstyled><li><a class=docs-link href=/docs/api/browser/>Browser libraries</a></li><li><a class=docs-link href=/docs/api/mcaptcha-system/>mCaptcha System Library</a></li><li><a class=docs-link href=/docs/api/pow-sha256/>pow_sha256</a></li></ul><h3>Help</h3><ul class=list-unstyled><li><a class=docs-link href=/docs/help/troubleshooting/>Troubleshooting</a></li><li><a class=docs-link href=/docs/help/faq/>FAQ</a></li></ul></nav></div><nav class="docs-toc d-none d-xl-block col-xl-3" aria-label="Secondary navigation"><div class=page-links><h3>On this page</h3><nav id=TableOfContents><ul><li><a href=#notes>Notes</a><ul><li><a href=#database>Database</a></li><li><a href=#redis>Redis</a></li></ul></li><li><a href=#instructions>Instructions</a><ul><li><a href=#docker>Docker</a></li><li><a href=#database-1>Database</a></li><li><a href=#redis-1>Redis</a></li><li><a href=#1-install-postgres-if-you-dont-have-it-already>1. Install Postgres if you don’t have it already.</a></li><li><a href=#2-create-new-user-for-running-mcaptcha>2. Create new user for running <code>mCaptcha</code></a></li><li><a href=#3-create-new-user-in-postgres>3. Create new user in Postgres</a></li><li><a href=#4-install-mcaptchacachehttpsgithubcommcaptchacache>4. Install <a href=https://github.com/mCaptcha/cache><code>mCaptcha/cache</code></a></a></li></ul></li></ul></nav></div></nav><main class="docs-content col-lg-11 col-xl-9"><h1>Database and cache</h1><p class=lead>mCaptcha server requires dependencies like a Postgres database and a Redis cache</p><h2 id=notes>Notes<a href=#notes class=anchor aria-hidden=true>#</a></h2><h3 id=database>Database<a href=#database class=anchor aria-hidden=true>#</a></h3><ul><li><p>Database migrations are baked into the server binary so don’t worry
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about them.</p></li><li><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></li></ul><h3 id=redis>Redis<a href=#redis class=anchor aria-hidden=true>#</a></h3><ul><li><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></li><li><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></li></ul><h2 id=instructions>Instructions<a href=#instructions class=anchor aria-hidden=true>#</a></h2><p>Once again, there are two ways to go about this:</p><ol><li>Docker</li><li>Bare metal</li></ol><h3 id=docker>Docker<a href=#docker class=anchor aria-hidden=true>#</a></h3><h3 id=database-1>Database<a href=#database-1 class=anchor aria-hidden=true>#</a></h3><p>Download and run Postgres</p><div class=highlight><pre 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="margin-right:.4em;padding:0 .4em;color:#7f7f7f">1</span>docker create --name mcaptcha-postgres <span style=color:#f1fa8c>\
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</span><span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">2</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 style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">3</span><span style=color:#f1fa8c></span> -p 5432:5432 <span style=color:#f1fa8c>\
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</span><span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">4</span><span style=color:#f1fa8c></span> postgres <span style=color:#ff79c6>&&</span> docker start mcaptcha-postgres
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</code></pre></div><h3 id=redis-1>Redis<a href=#redis-1 class=anchor aria-hidden=true>#</a></h3><div class=highlight><pre 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="margin-right:.4em;padding:0 .4em;color:#7f7f7f">1</span>docker create --name mcaptcha-cache <span style=color:#f1fa8c>\
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</span><span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">2</span><span style=color:#f1fa8c></span> -p 6379:6379 <span style=color:#f1fa8c>\
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</span><span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">3</span><span style=color:#f1fa8c></span> mcaptcha/cache <span style=color:#ff79c6>&&</span> docker start mcaptcha-cache
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</code></pre></div><p>See <a href=https://github.com/mCaptcha/cache>mCaptcha/cache</a> for more
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details.</p><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><p>For Debian based distributions:</p><div class=highlight><pre 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="margin-right:.4em;padding:0 .4em;color:#7f7f7f">1</span>sudo apt install postgres
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</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><div class=highlight><pre 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="margin-right:.4em;padding:0 .4em;color:#7f7f7f">1</span>$ sudo useradd -b /srv -m -s /usr/bin/bash mcaptcha
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</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><div class=highlight><pre 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="margin-right:.4em;padding:0 .4em;color:#7f7f7f">1</span>$ sudo -iu postgres <span style=color:#6272a4># switch to `postgres` user</span>
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<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">2</span>$ psql
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<span style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">3</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 style="margin-right:.4em;padding:0 .4em;color:#7f7f7f">4</span>$ createdb -O mcaptcha mcaptcha <span style=color:#6272a4># create db 'mcaptcha' with 'mcaptcha' as owner</span>
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</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><p>See <a href=https://github.com/mCaptcha/cache><code>mCaptcha/cache</code></a> for more
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