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Remote Networks
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Notifications Guide
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Name Resolution
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Authelia
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Performance
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Common Causes of Slowness
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Database and Log File Size
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Maintenance Plugins
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<a href="#1-database-cleanup-dbclnp" class="md-nav__link">
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1. Database Cleanup (DBCLNP)
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<a href="#2-maintenance-maint" class="md-nav__link">
<span class="md-ellipsis">
2. Maintenance (MAINT)
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Scan Frequency and Coverage
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Optimizations
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Storing Temporary Files in Memory
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Reverse DNS
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Reverse Proxy
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Webhooks (n8n)
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Workflows
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Workflow Examples
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Docker Swarm
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Common issues
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Random MAC
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Incorrect Offline Detection
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Device guides
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Device guides
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Editing Devices
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Management
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Bulk Editing
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Custom Properties
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Device Display Settings
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Session Info
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Icons and Topology
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Icons and Topology
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Icons
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Network Topology
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Troubleshooting
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Troubleshooting
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Inspecting Logs
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Debugging Tips
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Debugging GraphQL
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Debugging Invalid JSON
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Debugging PHP
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Debugging Plugins
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Debugging Web UI Port
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Debugging Workflows
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Environment Setup
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Builds
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Devcontainer
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Custom Plugins
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Plugin Config
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Frontend Development
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Database
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Settings
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Versions
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Icon and Type guessing
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API
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API
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Overview
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Devices Collection
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Device
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Sessions
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Settings
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Events
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Messaging in-app
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Metrics
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Net Tools
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Online History
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Sync
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GraphQL
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DB query
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Tests
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SUPERSEDED OLD API Overview
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Integrations
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Integrations
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Webhook Secret
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Helper scripts
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Table of contents
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Common Causes of Slowness
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Database and Log File Size
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Maintenance Plugins
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Scan Frequency and Coverage
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Optimizations
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Storing Temporary Files in Memory
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<h1 id="performance-optimization-guide">Performance Optimization Guide</h1>
<p>There are several ways to improve the application's performance. The application has been tested on a range of devices, from a Raspberry Pi 4 to NAS and NUC systems. If you are running the application on a lower-end device, carefully fine-tune the performance settings to ensure an optimal user experience.</p>
<h2 id="common-causes-of-slowness">Common Causes of Slowness</h2>
<p>Performance issues are usually caused by:</p>
<ul>
<li><strong>Incorrect settings</strong> – The app may restart unexpectedly. Check <code>app.log</code> under <strong>Maintenance → Logs</strong> for details.</li>
<li><strong>Too many background processes</strong> – Disable unnecessary scanners.</li>
<li><strong>Long scan durations</strong> – Limit the number of scanned devices.</li>
<li><strong>Excessive disk operations</strong> – Optimize scanning and logging settings.</li>
<li><strong>Failed maintenance plugins</strong> – Ensure maintenance tasks are running properly.</li>
</ul>
<p>The application performs regular maintenance and database cleanup. If these tasks fail, performance may degrade.</p>
<h3 id="database-and-log-file-size">Database and Log File Size</h3>
<p>A large database or oversized log files can slow down performance. You can check database and table sizes on the <strong>Maintenance</strong> page.</p>
<p><img alt="DB size check" src="../img/PERFORMANCE/db_size_check.png" /></p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<ul>
<li>For <strong>~100 devices</strong>, the database should be around <strong>50MB</strong>.</li>
<li>No table should exceed <strong>10,000 rows</strong> in a healthy system.</li>
<li>These numbers vary based on network activity and settings.</li>
</ul>
</div>
<hr />
<h2 id="maintenance-plugins">Maintenance Plugins</h2>
<p>Two plugins help maintain the application’s performance:</p>
<h3 id="1-database-cleanup-dbclnp"><strong>1. Database Cleanup (DBCLNP)</strong></h3>
<ul>
<li>Responsible for database maintenance.</li>
<li>Check settings in the <a href="/front/plugins/db_cleanup/README.md">DB Cleanup Plugin Docs</a>.</li>
<li>Ensure it’s not failing by checking logs.</li>
<li>Adjust the schedule (<code>DBCLNP_RUN_SCHD</code>) and timeout (<code>DBCLNP_RUN_TIMEOUT</code>) if needed.</li>
</ul>
<h3 id="2-maintenance-maint"><strong>2. Maintenance (MAINT)</strong></h3>
<ul>
<li>Handles log cleanup and other maintenance tasks.</li>
<li>Check settings in the <a href="/front/plugins/maintenance/README.md">Maintenance Plugin Docs</a>.</li>
<li>Ensure it’s running correctly by checking logs.</li>
<li>Adjust the schedule (<code>MAINT_RUN_SCHD</code>) and timeout (<code>MAINT_RUN_TIMEOUT</code>) if needed.</li>
</ul>
<hr />
<h2 id="scan-frequency-and-coverage">Scan Frequency and Coverage</h2>
<p>Frequent scans increase resource usage, network traffic, and database read/write cycles.</p>
<h3 id="optimizations"><strong>Optimizations</strong></h3>
<ul>
<li><strong>Increase scan intervals</strong> (<code>&lt;PLUGIN&gt;_RUN_SCHD</code>) on busy networks or low-end hardware.</li>
<li><strong>Extend scan timeouts</strong> (<code>&lt;PLUGIN&gt;_RUN_TIMEOUT</code>) to prevent failures.</li>
<li><strong>Reduce the subnet size</strong> – e.g., from <code>/16</code> to <code>/24</code> to lower scan loads.</li>
</ul>
<p>Some plugins have additional options to limit the number of scanned devices. If certain plugins take too long to complete, check if you can optimize scan times by selecting a scan range. </p>
<p>For example, the <strong>ICMP plugin</strong> allows you to specify a regular expression to scan only IPs that match a specific pattern.</p>
<hr />
<h2 id="storing-temporary-files-in-memory">Storing Temporary Files in Memory</h2>
<p>On systems with slower I/O speeds, you can optimize performance by storing temporary files in memory. This primarily applies to the API directory (default: <code>/tmp/api</code>, configurable via <code>NETALERTX_API</code>) and <code>/tmp/log</code> folders.</p>
<p>Using <code>tmpfs</code> reduces disk writes and improves performance. However, it should be <strong>disabled</strong> if persistent logs or API data storage are required.</p>
<p>Below is an optimized <code>docker-compose.yml</code> snippet:</p>
<pre><code class="language-yaml">version: &quot;3&quot;
services:
netalertx:
container_name: netalertx
# Uncomment the line below to test the latest dev image
# image: &quot;ghcr.io/jokob-sk/netalertx-dev:latest&quot;
image: &quot;ghcr.io/jokob-sk/netalertx:latest&quot;
network_mode: &quot;host&quot;
restart: unless-stopped
volumes:
- /local_data_dir/config:/data/config
- /local_data_dir/db:/data/db
# (Optional) Useful for debugging setup issues
- /local_data_dir/logs:/tmp/log
# (API: OPTION 1) Store temporary files in memory (recommended for performance)
- type: tmpfs # ◀ 🔺
target: /tmp/api # ◀ 🔺
# (API: OPTION 2) Store API data on disk (useful for debugging)
# - /local_data_dir/api:/tmp/api
# Ensuring the timezone is the same as on the server - make sure also the TIMEZONE setting is configured
- /etc/localtime:/etc/localtime:ro
environment:
- PORT=20211
</code></pre>
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