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<h1 id="concepts">Concepts</h1>
<figure>
<p><img align="center" alt="Overwiew" src="../assets/img/concepts.svg" /></p>
</figure>
<h2 id="integrations">Integrations</h2>
<p>The first concept is the integration of BunkerWeb into the target environment. We prefer to use the word "integration" instead of "installation" because one of the goals of BunkerWeb is to integrate seamlessly into existing environments.</p>
<p>The following integrations are officially supported :</p>
<ul>
<li><a href="/1.4/integrations/#docker">Docker</a></li>
<li><a href="/1.4/integrations/#docker-autoconf">Docker autoconf</a></li>
<li><a href="/1.4/integrations/#swarm">Swarm</a></li>
<li><a href="/1.4/integrations/#kubernetes">Kubernetes</a></li>
<li><a href="/1.4/integrations/#linux">Linux</a></li>
</ul>
<p>If you think that a new integration should be supported, do not hesitate to open a <a href="https://github.com/bunkerity/bunkerweb/issues">new issue</a> on the GitHub repository.</p>
<div class="admonition info">
<p class="admonition-title">Going further</p>
<p>The technical details of all BunkerWeb integrations are available in the <a href="/1.4/integrations">integrations section</a> of the documentation.</p>
</div>
<h2 id="settings">Settings</h2>
<p>Once BunkerWeb is integrated into your environment, you will need to configure it to serve and protect your web applications.</p>
<p>Configuration of BunkerWeb is done using what we called the "settings" or "variables". Each setting is identified by a name like <code>AUTO_LETS_ENCRYPT</code> or <code>USE_ANTIBOT</code> for example. You can assign values to the settings to configure BunkerWeb.</p>
<p>Here is a dummy example of a BunkerWeb configuration :</p>
<p><code>conf
SERVER_NAME=www.example.com
AUTO_LETS_ENCRYPT=yes
USE_ANTIBOT=captcha
REFERRER_POLICY=no-referrer
USE_MODSECURITY=no
USE_GZIP=yes
USE_BROTLI=no</code></p>
<div class="admonition info">
<p class="admonition-title">Going further</p>
<p>The complete list of available settings with descriptions and possible values is available in the <a href="/1.4/settings">settings section</a> of the documentation.</p>
</div>
<div class="admonition info">
<p class="admonition-title">Settings generator tool</p>
<p>To help you tuning BunkerWeb we have made an easy to use settings generator tool available at <a href="https://config.bunkerweb.io">config.bunkerweb.io</a>.</p>
</div>
<h2 id="multisite-mode">Multisite mode</h2>
<p>The multisite mode is a crucial concept to understand when using BunkerWeb. Because the goal is to protect web applications, we intrinsically inherit the concept of "virtual host" or "vhost" (more info <a href="https://en.wikipedia.org/wiki/Virtual_hosting">here</a>) which makes it possible to serve multiple web applications from a single (or a cluster of) instance.</p>
<p>By default, the multisite mode of BunkerWeb is disabled which means that only one web application will be served and all the settings will be applied to it. The typical use case is when you have a single application to protect : you don't have to worry about the multisite and the default behavior should be the right one for you.</p>
<p>When multisite mode is enabled, BunkerWeb will serve and protect multiple web applications. Each web application is identified by a unique server name and have its own set of settings. The typical use case is when you have multiple applications to protect and you want to use a single (or a cluster depending of the integration) instance of BunkerWeb.</p>
<p>The multisite mode is controlled by the <code>MULTISITE</code> setting which can be set to <code>yes</code> (enabled) or <code>no</code> (disabled, which is the default).</p>
<p>Each setting has a context which defines "where" it can be applied. If the context is global then the setting can't be set per server (or "per site", "per app") but only to the whole configuration. Otherwise, if the context is multisite, the setting can be set globally and per server. Defining a multisite setting to a specific server is done by adding the server name as a prefix of the setting name like <code>app1.example.com_AUTO_LETS_ENCRYPT</code> or <code>app2.example.com_USE_ANTIBOT</code> for example. When a multisite setting is defined globally (without any server prefix), all the servers will inherit that setting (but can still be overriden if we set the same setting with the server name prefix).</p>
<p>Here is a dummy example of a multisite BunkerWeb configuration :</p>
<p><code>conf
MULTISITE=yes
SERVER_NAME=app1.example.com app2.example.com app3.example.com
AUTO_LETS_ENCRYPT=yes
USE_GZIP=yes
USE_BROTLI=yes
app1.example.com_USE_ANTIBOT=javascript
app1.example.com_USE_MODSECURITY=no
app2.example.com_USE_ANTIBOT=cookie
app2.example.com_WHITELIST_COUNTRY=FR
app3.example.com_USE_BAD_BEHAVIOR=no</code></p>
<div class="admonition info">
<p class="admonition-title">Going further</p>
<p>You will find concrete examples of multisite mode in the <a href="/1.4/quickstart-guide">quickstart guide</a> of the documentation and the <a href="https://github.com/bunkerity/bunkerweb/tree/master/examples">examples</a> directory of the repository.</p>
</div>
<h2 id="custom-configurations">Custom configurations</h2>
<p>Because meeting all the use cases only using the settings is not an option (even with <a href="/1.4/plugins">external plugins</a>), you can use custom configurations to solve your specific challenges.</p>
<p>Under the hood, BunkerWeb uses the notorious NGINX web server, that's why you can leverage its configuration system for your specific needs. Custom NGINX configurations can be included in different <a href="https://docs.nginx.com/nginx/admin-guide/basic-functionality/managing-configuration-files/#contexts">contexts</a> like HTTP or server (all servers and/or specific server block).</p>
<p>Another core component of BunkerWeb is the ModSecurity Web Application Firewall : you can also use custom configurations to fix some false positives or add custom rules for example.</p>
<div class="admonition info">
<p class="admonition-title">Going further</p>
<p>You will find concrete examples of custom configurations in the <a href="/1.4/quickstart-guide">quickstart guide</a> of the documentation and the <a href="https://github.com/bunkerity/bunkerweb/tree/master/examples">examples</a> directory of the repository.</p>
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