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Reverse proxy
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Reverse proxy
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PiKVM Configuration
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Server Configuration
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Tailscale VPN
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WebRTC configuration
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Tuning HDMI EDID
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HDMI passthrough
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Peripheral devices
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ATX board
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USB configuration
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USB passthrough
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<article class="md-content__inner md-typeset">
<h1>Reverse proxy</h1>
<div><p>A reverse proxy allows you to pass requests through your web server to
another site or program. The reverse proxy will make it look like PiKVM
Web UI is a page within your existing site.</p>
<p>This is especially useful if:</p>
<ul>
<li>
<p>You need to access the WebUI on port <code>80</code> or <code>443</code> but you already host a website on the same device.</p>
</li>
<li>
<p>You want to share SSL certificates with an existing site.</p>
</li>
<li>
<p>You want to share authentication with an existing setup.</p>
</li>
</ul>
<hr>
<h2 id="pikvm-configuration">PiKVM Configuration<a class="headerlink" href="#pikvm-configuration" title="Permanent link"></a></h2>
<p>PiKVM supports reverse proxying since KVMD 4.51. For older version, please update OS first:</p>
<details class="note">
<summary>Updating PiKVM OS</summary>
<p>To update, run following commands under the <code>root</code> user:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>pikvm-update
</code></pre></div>
<p>If you encounter an error like:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>pikvm-update
<span class="go">bash: pikvm-update: command not found</span>
</code></pre></div>
<p>It's most likely you have an old OS release. You can update the OS as follows:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>rw
<span class="gp">[root@pikvm ~]# </span>pacman<span class="w"> </span>-Syy
<span class="gp">[root@pikvm ~]# </span>pacman<span class="w"> </span>-S<span class="w"> </span>pikvm-os-updater
<span class="gp">[root@pikvm ~]# </span>pikvm-update
</code></pre></div>
<p>Next time you will be able to use the usual method with <code>pikvm-update</code>.</p>
</details>
<p>By default, PiKVM redirects all requests from HTTP port <code>80</code> to HTTPS port <code>443</code> with self-signed
certificate. For the simplest configuration, you can leave it as it is, and terminate
SSL traffic from PiKVM on your web server.</p>
<p>Alternatively, you can change the HTTP and HTTPS ports on PiKVM or disable HTTPS at all
to deliver HTTP-only traffic to your server.</p>
<p>In both cases you should take care of your own SSL certificate for your web server because
when using HTTP-only access to your website, you will lose the ability to use some features
such as <a href="../video/">Direct H.264</a> streaming, because browser security policies will require
HTTPS for them.</p>
<details class="example">
<summary>Various examples with changing HTTP/HTTPS settings</summary>
<p>PiKVM uses Nginx internally, so don't be confused by its own configuration,
it has nothing to do with your reverse proxy if you're using Nginx too.</p>
<ul>
<li>
<p>Changing HTTP and HTTPS ports. Place this config to <code>/etc/kvmd/override.yaml</code> on PiKVM:</p>
<div class="highlight"><pre><span></span><code><span class="nt">nginx</span><span class="p">:</span>
<span class="w"> </span><span class="nt">https</span><span class="p">:</span>
<span class="w"> </span><span class="nt">port</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">4430</span>
<span class="w"> </span><span class="nt">http</span><span class="p">:</span>
<span class="w"> </span><span class="nt">port</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">8080</span>
</code></pre></div>
</li>
<li>
<p>Disabling HTTPS. All requests will be handled via HTTP port <code>80</code>.</p>
<div class="highlight"><pre><span></span><code><span class="nt">nginx</span><span class="p">:</span>
<span class="w"> </span><span class="nt">https</span><span class="p">:</span>
<span class="w"> </span><span class="nt">enabled</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span>
</code></pre></div>
</li>
</ul>
<p>Don't forget to run <code>systemctl restart kvmd-nginx</code> to apply your changes.</p>
</details>
<hr>
<h2 id="server-configuration">Server Configuration<a class="headerlink" href="#server-configuration" title="Permanent link"></a></h2>
<p>If you have access to your web servers configuration use the following examples
to pass the location <code>/pikvm</code> on the server to PiKVM Web UI hosted on <code>https://pikvm.local</code>
on HTTPS port <code>443</code>.</p>
<h3 id="nginx">Nginx<a class="headerlink" href="#nginx" title="Permanent link"></a></h3>
<p>Nginx does not validate certificates by default and PiKVM's self-signed certificate is fine for it.</p>
<div class="highlight"><pre><span></span><code><span class="k">location</span><span class="w"> </span><span class="s">/pikvm</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kn">rewrite</span><span class="w"> </span><span class="s">^/pikvm</span>$<span class="w"> </span><span class="s">/</span><span class="w"> </span><span class="s">break</span><span class="p">;</span>
<span class="w"> </span><span class="kn">rewrite</span><span class="w"> </span><span class="s">^/pikvm\?(.*)</span>$<span class="w"> </span><span class="s">?</span><span class="nv">$1</span><span class="w"> </span><span class="s">break</span><span class="p">;</span>
<span class="w"> </span><span class="kn">rewrite</span><span class="w"> </span><span class="s">^/pikvm/(.*)</span>$<span class="w"> </span><span class="s">/</span><span class="nv">$1</span><span class="w"> </span><span class="s">break</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_redirect</span><span class="w"> </span><span class="p">~</span><span class="sr">^(/.*)$</span><span class="w"> </span><span class="s">/pikvm</span><span class="nv">$1</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_pass</span><span class="w"> </span><span class="s">https://pikvm.local</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_set_header</span><span class="w"> </span><span class="s">Host</span><span class="w"> </span><span class="nv">$host</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_set_header</span><span class="w"> </span><span class="s">X-Real-IP</span><span class="w"> </span><span class="nv">$remote_addr</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_set_header</span><span class="w"> </span><span class="s">X-Scheme</span><span class="w"> </span><span class="nv">$scheme</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_set_header</span><span class="w"> </span><span class="s">X-Forwarded-Proto</span><span class="w"> </span><span class="nv">$scheme</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_set_header</span><span class="w"> </span><span class="s">X-Forwarded-Port</span><span class="w"> </span><span class="nv">$server_port</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_set_header</span><span class="w"> </span><span class="s">X-Forwarded-For</span><span class="w"> </span><span class="nv">$proxy_add_x_forwarded_for</span><span class="p">;</span>
<span class="w"> </span><span class="c1"># For some handles (like MJPEG) buffering should be disabled</span>
<span class="w"> </span><span class="kn">postpone_output</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_buffering</span><span class="w"> </span><span class="no">off</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_ignore_headers</span><span class="w"> </span><span class="s">X-Accel-Buffering</span><span class="p">;</span>
<span class="w"> </span><span class="c1"># Some handles (ends with /ws) are WebSockets</span>
<span class="w"> </span><span class="kn">proxy_set_header</span><span class="w"> </span><span class="s">Upgrade</span><span class="w"> </span><span class="nv">$http_upgrade</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_set_header</span><span class="w"> </span><span class="s">Connection</span><span class="w"> </span><span class="s">"upgrade"</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_connect_timeout</span><span class="w"> </span><span class="s">7d</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_send_timeout</span><span class="w"> </span><span class="s">7d</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_read_timeout</span><span class="w"> </span><span class="s">7d</span><span class="p">;</span>
<span class="w"> </span><span class="c1"># Some other handles requires big POST payload</span>
<span class="w"> </span><span class="kn">client_max_body_size</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="w"> </span><span class="kn">proxy_request_buffering</span><span class="w"> </span><span class="no">off</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="caddy">Caddy<a class="headerlink" href="#caddy" title="Permanent link"></a></h3>
<p>Caddy doesn't like self-signed certificates, so we'll have to convince it that it's okay.</p>
<div class="highlight"><pre><span></span><code><span class="k">handle_path</span><span class="w"> </span><span class="s">/pikvm/*</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kn">reverse_proxy</span><span class="w"> </span><span class="s">https://pikvm.local</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kn">transport</span><span class="w"> </span><span class="s">http</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kn">tls_insecure_skip_verify</span><span class="w"> </span><span class="c1"># Same behaviour as Nginx</span>
<span class="w"> </span><span class="err">}</span>
<span class="w"> </span><span class="s">header_up</span><span class="w"> </span><span class="s">Host</span><span class="w"> </span><span class="p">{</span><span class="kn">upstream_hostport}</span>
<span class="w"> </span><span class="s">header_down</span><span class="w"> </span><span class="s">Location</span><span class="w"> </span><span class="s">"^(/.*)</span><span class="nv">$"</span><span class="w"> </span><span class="s">"/pikvm</span><span class="nv">$1"</span>
<span class="w"> </span><span class="err">}</span>
<span class="err">}</span>
</code></pre></div></div>
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