User Guide Functional Overview Requirements Architecture System Installation NetEye Additional Components Installation Setup The neteye Command Director NetEye Self Monitoring Tornado Business Service Monitoring IT Operation Analytics - Telemetry Geo Maps NagVis Audit Log Shutdown Manager Reporting ntopng Visual Monitoring with Alyvix Elastic Stack IT Operations (Command Orchestrator) Asset Management Service Level Management Cyber Threat Intelligence - SATAYO NetEye Update & Upgrade How To NetEye Extension Packs Troubleshooting Security Policy Glossary
module icon Troubleshooting
Setup Configure swappiness Restarting Stopped Services Enable stack traces in web UI How to access standard logs Director does not deploy when services assigned to a host have the same name How to enable/disable debug logging Activate Debug Logging for Tornado Modules/Services do not start Sync Rule fails when trying to recreate Icinga object How to disable InfluxDB query logging Managing an Elasticsearch Cluster with a Full Disk Some logs are not indexed in Elasticsearch Elasticsearch is not functioning properly Reporting: Error when opening a report Debugging Logstash file input filter
NetEye Update & Upgrade How To NetEye Extension Packs Troubleshooting Security Policy Glossary Introduction to NetEye Monitoring Business Service Monitoring IT Operation Analytics Visualization Network Visibility Log Management & Security Orchestrated Datacenter Shutdown Application Performance Monitoring User Experience Service Management Service Level Management & Reporting Requirements for a Node Cluster Requirements and Best Practices NetEye Satellite Requirements TCP and UDP Ports Requirements Additional Software Installation Introduction Single Node Cluster NetEye Master Master-Satellite Architecture Underlying Operating System Acquiring NetEye ISO Image Installing ISO Image Single Nodes and Satellites Cluster Nodes Configuration of Tenants Satellite Nodes Only Nodes behind a Proxy Additional NetEye Components Single Node Cluster Node Satellites Nodes only Verify if a module is running correctly Accessing the New Module Cluster Satellite Security Identity and Access Management External Identity Providers Configure federated LDAP/AD Emergency Reset of Keycloak Configuration Advanced Configuration Authorization Resources Tuning Advanced Topics Basic Concepts & Usage Advanced Topics Monitoring Environment Templates Monitored Objects Import Monitored Objects Data Fields Deployment Icinga 2 Agents Configuration Baskets Dashboard Monitoring Status VMD Permissions Notifications Jobs API Configuring Icinga Monitoring Retention Policy NetEye Self Monitoring 3b Concepts Collecting Events Add a Filter Node WHERE Conditions Iterating over Event fields Retrieving Payload of an Event Extract Variables Create a Rule Tornado Actions Test your Configuration Export and Import Configuration Example Under the hood Development Retry Strategy Configuration Thread Pool Configuration API Reference Configure a new Business Process Create your first Business Process Node Importing Processes Operators The ITOA Module Configuring User Permissions Telegraf Metrics in NetEye Telegraf Configuration Telegraf on Monitored Hosts Visualizing Dashboards Customizing Performance Graph The NetEye Geo Map Visualizer Map Viewer Configuring Geo Maps NagVis 3b Audit Log 3b Overview Shutdown Manager user Shutdown Manager GUI Shutdown Commands Advanced Topics Overview User Role Management Cube Use Cases ntopng and NetEye Integration Permissions Retention Advanced Topics Overview User Roles Nodes Test Cases Dashboard Use Cases Overview Architecture Authorization Elasticsearch Overview Enabling El Proxy Sending custom logs to El Proxy Configuration files Commands Elasticsearch Templates and Retentions El Proxy DLQ Blockchain Verification Handling Blockchain Corruptions El Proxy Metrics El Proxy Security El Proxy REST Endpoints Agents Logstash Elastic APM Elastic RUM Log Manager - Deprecated Overview Authorization in the Command Orchestrator Module Configuring CLI Commands Executing Commands Overview Permissions Installation Single Tenancy Multitenancy Communication through a Satellite Asset collection methods Display asset information in monitoring host page Overview Customers Availability Event Adjustment Outages Resource Advanced Topics Introduction Getting Started SATAYO Items Settings Managed Service Mitre Attack Coverage Changelog Before you start Update Procedure Single Node Upgrade from 4.41 to 4.42 Cluster Upgrade from 4.41 to 4.42 Satellite Upgrade from 4.41 to 4.42 DPO machine Upgrade from 4.41 to 4.42 Create a mirror of the RPM repository Sprint Releases Feature Troubleshooting Tornado Networking Service Management - Incident Response IT Operation Analytics - Telemetry Identity Provider (IdP) Configuration Introduction to NEP Getting Started with NEPs Online Resources Obtaining NEP Insights Available Packages Advanced Topics Upgrade to NetEye 4.31 Setup Configure swappiness Restarting Stopped Services Enable stack traces in web UI How to access standard logs Director does not deploy when services assigned to a host have the same name How to enable/disable debug logging Activate Debug Logging for Tornado Modules/Services do not start Sync Rule fails when trying to recreate Icinga object How to disable InfluxDB query logging Managing an Elasticsearch Cluster with a Full Disk Some logs are not indexed in Elasticsearch Elasticsearch is not functioning properly Reporting: Error when opening a report Debugging Logstash file input filter Bugfix Policy Reporting Vulnerabilities Glossary 3b

Configure swappiness

In this section you will learn how to configure Swap usage on NetEye.

What is Swappiness

Swappiness is a kernel parameter that controls how the system handles the management of virtual memory, particularly when it comes to swapping data between RAM (Random Access Memory) and the swap space (a designated area on the hard drive used as an extension of physical memory).

When a system’s physical RAM becomes fully utilized, the kernel must decide which data to keep in RAM and which data to move to the swap space to free up space for new data. Swappiness determines the balance between preserving physical memory and making efficient use of the swap space.

The swappiness value, ranging from 0 to 200, controls the degree to which the system favors reclaiming memory from the anonymous memory pool, or the page cache memory pool.

  • A swappiness value of 1: The kernel avoids swapping data out of RAM as much as possible. It prefers to keep data in RAM and only start swapping when the RAM is almost completely full.

  • A swappiness value of 200: The kernel aggressively moves data to the swap space. It prioritizes freeing up RAM space, even if it’s not being fully utilized.

  • Setting the vm.swappiness to 0 aggressively avoids swapping anonymous memory out to a disk, this increases the risk of processes being killed by the oom_killer function when under memory or I/O intensive workloads.

The default swappiness value is set to a moderate value of 60.

Setting Swappiness value

To check actual swappiness value set for every cgroup on your system use:

grep . /sys/fs/cgroup/memory/*/memory.swappiness

To change the value for every cgroup create or edit file /etc/sysctl.d/zzz-swappiness.conf

neteye# cat /etc/sysctl.d/zzz-swappiness.conf

vm.swappiness = 1
vm.force_cgroup_v2_swappiness = 1

To immediately apply this change on your system run:

sysctl -p /etc/sysctl.d/zzz-swappiness.conf

The sysctl values are loaded early in boot via initramfs, so finally, rebuild initramfs to override any previous persistent sysctl settings in the initial ramdisk image.

dracut -f -v
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