pikvm/netbird/index.html

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PiKVM Handbook
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Device guides
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PiKVM V4 Mini &amp; Plus
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PiKVM V3
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PiKVM Switch
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DIY PiKVM V2
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DIY PiKVM V1
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Getting started
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Getting started
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Cheat sheet
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Web UI overview
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Sending shortcuts
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Configuring PiKVM
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Authentication &amp; 2FA
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FAQ &amp; troubleshooting
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Flashing OS
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Networking
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Internet access
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Internet access
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Port forwarding
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Reverse proxy
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Tailscale VPN
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Cloudflare tunnel
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NetBird VPN
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NetBird VPN
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Table of contents
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Setting up the overlay
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Installing NetBird
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Updating NetBird
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Registering the device
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Option 1: Setup key (recommended)
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Option 2: Interactive SSO login
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Verifying and persisting
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Configuring a client device
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Troubleshooting
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Setting up Wi-Fi
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Setting up 3G/4G/LTE modem
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Let's Encrypt certificates
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Video
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Video modes (WebRTC, Direct)
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WebRTC configuration
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Tuning HDMI EDID
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HDMI passthrough
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Latency
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Peripheral devices
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<h1>NetBird VPN</h1>
<div><p><a href="https://netbird.io/">NetBird</a> can be used to access PiKVM from the Internet
if configuring <a href="../port_forwarding/">port forwarding</a> is not possible or more
security is desired. NetBird is an open-source, self-hostable WireGuard-based mesh
VPN that connects devices peer-to-peer without a central gateway. NetBird also offers a free (for private use)
hosted management service. </p>
<p>Because PiKVM's root filesystem is read-only, NetBird requires an overlay
filesystem so it can write runtime state without modifying the underlying disk.</p>
<p>The origin of this guide can be found <a href="https://netbird.io/knowledge-hub/netbird-on-pikvm">here</a>.</p>
<hr>
<h2 id="setting-up-the-overlay">Setting up the overlay<a class="headerlink" href="#setting-up-the-overlay" title="Permanent link"></a></h2>
<p>The NetBird client stores its state in <code>/var/lib/netbird</code>. On PiKVM this path must be
writable at runtime, so we mount an overlay backed by tmpfs over a persistent
copy of the state.</p>
<ol>
<li>
<p>Switch to read-write mode and create the persistent state directory:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>rw
<span class="gp">[root@pikvm ~]# </span>mkdir<span class="w"> </span>-p<span class="w"> </span>/root/netbird-state
</code></pre></div>
</li>
<li>
<p>Create the helper script. Save as <code>/usr/local/bin/setup-netbird-overlay.sh</code>:</p>
<div class="highlight"><pre><span></span><code><span class="ch">#!/bin/bash</span>
<span class="nb">set</span><span class="w"> </span>-e
<span class="c1"># Mount a tmpfs for writable NetBird state</span>
mkdir<span class="w"> </span>-p<span class="w"> </span>/tmp/netbird-state
mount<span class="w"> </span>-t<span class="w"> </span>tmpfs<span class="w"> </span>tmpfs<span class="w"> </span>/tmp/netbird-state
<span class="c1"># Copy persistent state into the writable tmpfs</span>
<span class="k">if</span><span class="w"> </span><span class="o">[</span><span class="w"> </span>-d<span class="w"> </span>/root/netbird-state<span class="w"> </span><span class="o">]</span><span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w"> </span>cp<span class="w"> </span>-a<span class="w"> </span>/root/netbird-state/.<span class="w"> </span>/tmp/netbird-state/
<span class="k">fi</span>
<span class="c1"># Bind mount over /var/lib/netbird so NetBird sees the writable copy</span>
mkdir<span class="w"> </span>-p<span class="w"> </span>/var/lib/netbird
mountpoint<span class="w"> </span>-q<span class="w"> </span>/var/lib/netbird<span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span>umount<span class="w"> </span>/var/lib/netbird<span class="w"> </span><span class="o">||</span><span class="w"> </span><span class="nb">true</span>
mount<span class="w"> </span>--bind<span class="w"> </span>/tmp/netbird-state<span class="w"> </span>/var/lib/netbird
</code></pre></div>
<p>Make it executable:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>chmod<span class="w"> </span>+x<span class="w"> </span>/usr/local/bin/setup-netbird-overlay.sh
</code></pre></div>
</li>
<li>
<p>Create a systemd unit to run the setup before NetBird starts and save
state back on stop. Save as <code>/etc/systemd/system/netbird-overlay.service</code>:</p>
<div class="highlight"><pre><span></span><code><span class="k">[Unit]</span>
<span class="na">Description</span><span class="o">=</span><span class="s">Setup tmpfs overlay for NetBird</span>
<span class="na">After</span><span class="o">=</span><span class="s">local-fs.target tmp.mount</span>
<span class="na">Before</span><span class="o">=</span><span class="s">netbird@netbird.service</span>
<span class="k">[Service]</span>
<span class="na">Type</span><span class="o">=</span><span class="s">oneshot</span>
<span class="na">ExecStart</span><span class="o">=</span><span class="s">/usr/local/bin/setup-netbird-overlay.sh</span>
<span class="na">ExecStop</span><span class="o">=</span><span class="s">/bin/sh -c 'cp -a /tmp/netbird-state/. /root/netbird-state/'</span>
<span class="na">RemainAfterExit</span><span class="o">=</span><span class="s">yes</span>
<span class="k">[Install]</span>
<span class="na">WantedBy</span><span class="o">=</span><span class="s">multi-user.target</span>
</code></pre></div>
</li>
<li>
<p>Enable the overlay service:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span>daemon-reload
<span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span><span class="nb">enable</span><span class="w"> </span>netbird-overlay.service
</code></pre></div>
</li>
</ol>
<hr>
<h2 id="installing-netbird">Installing NetBird<a class="headerlink" href="#installing-netbird" title="Permanent link"></a></h2>
<p>NetBird is installed from the <a href="https://aur.archlinux.org/packages/netbird-bin">AUR</a>
using <code>makepkg</code>. The <code>netbird-bin</code> package provides pre-built binaries with SHA256
checksum verification, avoiding the need to compile from source on the Pi.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><code>makepkg</code> must not run as root. PiKVM provides the unprivileged <code>kvmd-webterm</code>
user for this purpose.</p>
</div>
<ol>
<li>
<p>Update the system and install the build dependencies, then clone the AUR package:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>pacman<span class="w"> </span>-Syu<span class="w"> </span>--needed<span class="w"> </span>git<span class="w"> </span>base-devel
<span class="gp">[root@pikvm ~]# </span><span class="nb">cd</span><span class="w"> </span>/tmp
<span class="gp">[root@pikvm tmp]# </span>git<span class="w"> </span>clone<span class="w"> </span>https://aur.archlinux.org/netbird-bin.git
<span class="gp">[root@pikvm tmp]# </span>chown<span class="w"> </span>-R<span class="w"> </span>kvmd-webterm:kvmd-webterm<span class="w"> </span>netbird-bin
</code></pre></div>
</li>
<li>
<p>Build the package as the <code>kvmd-webterm</code> user:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm tmp]# </span>su<span class="w"> </span>-s<span class="w"> </span>/bin/bash<span class="w"> </span>kvmd-webterm<span class="w"> </span>-c<span class="w"> </span><span class="s1">'cd /tmp/netbird-bin &amp;&amp; makepkg'</span>
</code></pre></div>
<p>This will download the NetBird binary for your architecture, verify its
SHA256 checksum, and create a pacman package.</p>
</li>
<li>
<p>Install the built package:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm tmp]# </span>pacman<span class="w"> </span>-U<span class="w"> </span>/tmp/netbird-bin/netbird-bin-*.pkg.tar.*
</code></pre></div>
</li>
<li>
<p>Clean up the build directory:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm tmp]# </span>rm<span class="w"> </span>-rf<span class="w"> </span>/tmp/netbird-bin
<span class="gp">[root@pikvm tmp]# </span><span class="nb">cd</span><span class="w"> </span>~
</code></pre></div>
</li>
<li>
<p>Create a systemd override to adapt the service for PiKVM's read-only filesystem:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>mkdir<span class="w"> </span>-p<span class="w"> </span>/etc/systemd/system/netbird@.service.d
</code></pre></div>
<p>Save the following as <code>/etc/systemd/system/netbird@.service.d/pikvm.conf</code>:</p>
<div class="highlight"><pre><span></span><code><span class="k">[Unit]</span>
<span class="na">After</span><span class="o">=</span><span class="s">netbird-overlay.service</span>
<span class="na">Requires</span><span class="o">=</span><span class="s">netbird-overlay.service</span>
<span class="k">[Service]</span>
<span class="na">ExecStart</span><span class="o">=</span>
<span class="na">ExecStart</span><span class="o">=</span><span class="s">/usr/bin/netbird service run --log-file syslog --daemon-addr unix:///var/run/netbird/%i.sock</span>
<span class="na">LogsDirectory</span><span class="o">=</span>
<span class="na">Environment</span><span class="o">=</span><span class="s">NB_DISABLE_SSH_CONFIG=true</span>
</code></pre></div>
<p>The key changes from the default service file are:</p>
<ul>
<li><strong><code>After=</code> and <code>Requires=</code></strong> include <code>netbird-overlay.service</code> so the
overlay is mounted before NetBird starts.</li>
<li><strong><code>ExecStart=</code></strong> is cleared then set with <code>--log-file syslog</code> instead of
a file path, since <code>/var/log</code> is read-only.</li>
<li><strong><code>LogsDirectory=</code></strong> is cleared to prevent systemd from trying to create
a log directory on the read-only filesystem.</li>
<li><strong><code>NB_DISABLE_SSH_CONFIG=true</code></strong> prevents NetBird from writing SSH
shortcut configuration to <code>/etc/ssh/ssh_config.d/99-netbird.conf</code>,
which would fail on the read-only filesystem. This only disables
the convenience of <code>ssh &lt;peer-name&gt;</code> -- SSH over NetBird still works
using the peer's IP address directly.</li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The empty <code>ExecStart=</code> line is <strong>not a typo</strong>. In systemd, <code>ExecStart</code>
is a list-type setting. An empty assignment clears the previous value so
the next line replaces it rather than appending to it.</p>
</div>
</li>
<li>
<p>Enable and start the services:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span>daemon-reload
<span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span><span class="nb">enable</span><span class="w"> </span>netbird@netbird.service
<span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span>start<span class="w"> </span>netbird-overlay.service
<span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span>start<span class="w"> </span>netbird@netbird.service
</code></pre></div>
</li>
</ol>
<hr>
<h2 id="updating-netbird">Updating NetBird<a class="headerlink" href="#updating-netbird" title="Permanent link"></a></h2>
<p>Since NetBird is installed from the AUR rather than an official repository,
updates must be performed manually by rebuilding the package.</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>rw
<span class="gp">[root@pikvm ~]# </span><span class="nb">cd</span><span class="w"> </span>/tmp
<span class="gp">[root@pikvm tmp]# </span>git<span class="w"> </span>clone<span class="w"> </span>https://aur.archlinux.org/netbird-bin.git
<span class="gp">[root@pikvm tmp]# </span>chown<span class="w"> </span>-R<span class="w"> </span>kvmd-webterm:kvmd-webterm<span class="w"> </span>netbird-bin
<span class="gp">[root@pikvm tmp]# </span>su<span class="w"> </span>-s<span class="w"> </span>/bin/bash<span class="w"> </span>kvmd-webterm<span class="w"> </span>-c<span class="w"> </span><span class="s1">'cd /tmp/netbird-bin &amp;&amp; makepkg'</span>
<span class="gp">[root@pikvm tmp]# </span>pacman<span class="w"> </span>-U<span class="w"> </span>/tmp/netbird-bin/netbird-bin-*.pkg.tar.*
<span class="gp">[root@pikvm tmp]# </span>rm<span class="w"> </span>-rf<span class="w"> </span>/tmp/netbird-bin
<span class="gp">[root@pikvm tmp]# </span><span class="nb">cd</span><span class="w"> </span>~
<span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span>restart<span class="w"> </span>netbird@netbird
<span class="gp">[root@pikvm ~]# </span>ro
</code></pre></div>
<hr>
<h2 id="registering-the-device">Registering the device<a class="headerlink" href="#registering-the-device" title="Permanent link"></a></h2>
<p>There are two ways to register your PiKVM with NetBird. The <code>--disable-dns</code>
flag is used in both cases to prevent NetBird from trying to write to
<code>/etc/resolv.conf</code> on the read-only filesystem.</p>
<h3 id="option-1-setup-key-recommended">Option 1: Setup key (recommended)<a class="headerlink" href="#option-1-setup-key-recommended" title="Permanent link"></a></h3>
<p>Setup keys allow registration without any browser interaction, making them
ideal for headless devices like PiKVM.</p>
<ol>
<li>
<p>Log in to the <a href="https://app.netbird.io/">NetBird dashboard</a> and navigate to
<strong>Setup Keys</strong>. Create a new key.</p>
</li>
<li>
<p>Register your PiKVM using the setup key:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>netbird<span class="w"> </span>up<span class="w"> </span>--setup-key<span class="w"> </span>&lt;YOUR_SETUP_KEY&gt;<span class="w"> </span>--disable-dns
</code></pre></div>
</li>
</ol>
<h3 id="option-2-interactive-sso-login">Option 2: Interactive SSO login<a class="headerlink" href="#option-2-interactive-sso-login" title="Permanent link"></a></h3>
<p>You can also use the standard SSO login flow. PiKVM does not have a browser,
but the activation URL can be opened on any other device.</p>
<ol>
<li>
<p>Start the login flow:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>netbird<span class="w"> </span>up<span class="w"> </span>--disable-dns
</code></pre></div>
</li>
<li>
<p>NetBird will print an activation URL in the terminal, for example:</p>
<div class="highlight"><pre><span></span><code>Please do the SSO login in your browser.
If your browser didn't open automatically, use this URL to log in:
https://login.netbird.io/activate?user_code=XXXX-XXXX
</code></pre></div>
</li>
<li>
<p>Copy this URL and open it in a browser on your computer or phone.
Complete the login there. The PiKVM terminal will proceed automatically
once authentication is confirmed.</p>
</li>
</ol>
<h3 id="verifying-and-persisting">Verifying and persisting<a class="headerlink" href="#verifying-and-persisting" title="Permanent link"></a></h3>
<ol>
<li>
<p>Verify the connection:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>netbird<span class="w"> </span>status
</code></pre></div>
<p>You should see <code>Status: Connected</code> and a NetBird IP address (e.g. <code>100.x.x.x</code>).</p>
</li>
<li>
<p>Persist the authentication state so it survives reboots:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>rw
<span class="gp">[root@pikvm ~]# </span>cp<span class="w"> </span>-a<span class="w"> </span>/tmp/netbird-state/.<span class="w"> </span>/root/netbird-state/
<span class="gp">[root@pikvm ~]# </span>ro
</code></pre></div>
</li>
<li>
<p>Reboot to verify everything starts automatically:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>reboot
</code></pre></div>
</li>
</ol>
<div class="admonition warning">
<p class="admonition-title">Persist state after configuration changes</p>
<p>Because the overlay uses tmpfs, any changes NetBird writes at runtime
(authentication tokens, key rotations, etc.) exist only in RAM. After making
configuration changes or re-authenticating, always persist the state:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>rw
<span class="gp">[root@pikvm ~]# </span>cp<span class="w"> </span>-a<span class="w"> </span>/tmp/netbird-state/.<span class="w"> </span>/root/netbird-state/
<span class="gp">[root@pikvm ~]# </span>ro
</code></pre></div>
</div>
<hr>
<h2 id="configuring-a-client-device">Configuring a client device<a class="headerlink" href="#configuring-a-client-device" title="Permanent link"></a></h2>
<ul>
<li><a href="https://www.netbird.io/download">Download</a> and install the NetBird client
on the system you are using (not the system you want to control).</li>
<li>Check the <a href="https://app.netbird.io/">NetBird dashboard</a> to see your connected peers.</li>
<li>Open <code>https://&lt;netbird_kvm_ip&gt;</code> in your browser to access the PiKVM web interface.</li>
</ul>
<hr>
<h2 id="troubleshooting">Troubleshooting<a class="headerlink" href="#troubleshooting" title="Permanent link"></a></h2>
<ul>
<li>
<p><strong>Service fails with <code>status=209/STDOUT</code></strong>: The service is trying to write
logs to a file on the read-only filesystem. Make sure the systemd override
includes <code>--log-file syslog</code> as described above.</p>
</li>
<li>
<p><strong><code>mount: tmpfs: mount failed</code></strong>: The tmpfs mount in the overlay script is
failing. Check that <code>/tmp</code> is writable and that the script is executable
(<code>chmod +x /usr/local/bin/setup-netbird-overlay.sh</code>).</p>
</li>
<li>
<p><strong>DNS lookup failures (<code>DeadlineExceeded</code>)</strong>: If NetBird cannot reach
<code>api.netbird.io</code>, check that your PiKVM has working DNS resolution:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>curl<span class="w"> </span>-v<span class="w"> </span>--max-time<span class="w"> </span><span class="m">10</span><span class="w"> </span>https://api.netbird.io:443
</code></pre></div>
<p>If DNS is broken, verify <code>/etc/resolv.conf</code> contains a valid nameserver.
A stale NetBird daemon process can also cause this; restart the service:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span>restart<span class="w"> </span>netbird@netbird
</code></pre></div>
</li>
<li>
<p><strong>Need to re-authenticate after reboot</strong>: You forgot to persist the state.
Run <code>netbird up --setup-key &lt;KEY&gt; --disable-dns</code> again, then persist:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>rw
<span class="gp">[root@pikvm ~]# </span>cp<span class="w"> </span>-a<span class="w"> </span>/tmp/netbird-state/.<span class="w"> </span>/root/netbird-state/
<span class="gp">[root@pikvm ~]# </span>ro
</code></pre></div>
</li>
<li>
<p>If something does not work, the usual advice is to completely remove NetBird
and perform a clean installation:</p>
<div class="highlight"><pre><span></span><code><span class="gp">[root@pikvm ~]# </span>rw
<span class="gp">[root@pikvm ~]# </span>netbird<span class="w"> </span>down
<span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span>stop<span class="w"> </span>netbird@netbird
<span class="gp">[root@pikvm ~]# </span>systemctl<span class="w"> </span>disable<span class="w"> </span>netbird@netbird<span class="w"> </span>netbird-overlay
<span class="gp">[root@pikvm ~]# </span>pacman<span class="w"> </span>-Rns<span class="w"> </span>netbird-bin
<span class="gp">[root@pikvm ~]# </span>rm<span class="w"> </span>-rf<span class="w"> </span>/var/lib/netbird<span class="w"> </span>/root/netbird-state
<span class="gp">[root@pikvm ~]# </span>rm<span class="w"> </span>-rf<span class="w"> </span>/etc/systemd/system/netbird@.service.d
<span class="gp">[root@pikvm ~]# </span>reboot
</code></pre></div>
<p>Now follow the instructions from the beginning to re-install.</p>
</li>
</ul></div>
</article>
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