Monitoring Linux devices

This document describes how you can monitor “private” services and attributes of GNU/Linux devices, such as:

  • Memory usage
  • CPU load
  • Disk usage
  • Running processes
  • etc.

Available Methods

Several methods to monitor GNU/Linux devices are available:

  • SNMP – Install or activate the linux SNMP agent and configure it to serve system statistics;
  • Local Agent – Provides faster query interval, more flexibility, passive and active communication methods;
  • SSH – Should only be executed for infrequent checks as these have a high impact on the client and server CPU. It’s also very slow to execute overall, and will not scale when polling thousands of devices;
  • Monitoring Publicly Available Services – Public services provided by GNU/Linux devices (like HTTP, FTP, POP3, etc.) can be easily monitored.
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