How to monitor CPU utilization in nagios?

Nagios is a powerful monitoring system that allows you to keep a close eye on various aspects of your infrastructure. One crucial aspect to monitor is the CPU utilization of your servers. By monitoring CPU utilization, you can identify potential bottlenecks, detect abnormal behavior, and ensure that your systems are running efficiently. In this article, we will discuss how to monitor CPU utilization in Nagios and provide answers to some common related questions.

How to Monitor CPU Utilization in Nagios?

Monitoring CPU utilization in Nagios can be achieved by following these steps:

1. Enable SNMP on the target server: Before you can monitor CPU utilization, you need to ensure SNMP (Simple Network Management Protocol) is enabled on the server you want to monitor. Consult the server’s documentation or IT team for guidance on enabling SNMP.

2. Install SNMP plugins on Nagios Server: Install the necessary SNMP plugins on your Nagios server to facilitate communication with the target server via SNMP. These plugins provide the commands required to monitor the CPU utilization.

3. Configure the target server in Nagios: Once SNMP is enabled on the target server and the SNMP plugins are installed on the Nagios server, you need to configure the target server in Nagios. This involves defining the server, specifying its IP address, SNMP community string, and other relevant details.

4. Create a service definition: Next, you need to create a service definition in Nagios to monitor the CPU utilization of the target server. This definition includes parameters such as the command to check CPU utilization, acceptable thresholds, and notification settings.

5. Apply configuration changes and restart Nagios: After defining the service, save the changes to the configuration files and restart Nagios. The monitoring system will now regularly check the CPU utilization of the target server based on the defined parameters.

6. Monitor CPU utilization in Nagios: With the configuration in place, Nagios will start monitoring the CPU utilization of the target server. It will check the utilization against the specified thresholds and trigger notifications if it exceeds the defined limits.

The steps above provide a high-level overview of how to monitor CPU utilization in Nagios. However, it is important to note that the specific commands and configurations may vary depending on your environment, operating system, and Nagios setup.

Related FAQs:


What is CPU utilization?

CPU utilization refers to the percentage of time the CPU spends executing non-idle tasks.


Why is it important to monitor CPU utilization?

Monitoring CPU utilization helps identify resource bottlenecks, detect abnormal system behavior, and optimize system performance.


What are acceptable CPU utilization thresholds?

Acceptable CPU utilization thresholds depend on factors such as the server’s capabilities and workload. Generally, sustained CPU utilization above 80% might indicate performance issues.


Can Nagios monitor CPU utilization on different operating systems?

Yes, Nagios can monitor CPU utilization on various operating systems as long as SNMP is enabled and the appropriate plugins are installed.


Can Nagios alert me when CPU utilization exceeds a certain threshold?

Yes, Nagios can send notifications when CPU utilization exceeds defined thresholds, allowing you to take timely action.


Can I monitor CPU utilization across multiple servers with Nagios?

Yes, Nagios enables you to monitor CPU utilization across multiple servers by configuring individual service definitions for each server.


What happens if CPU utilization exceeds the defined threshold?

If CPU utilization exceeds the defined threshold, Nagios can trigger notifications such as email alerts or SMS messages to notify the appropriate personnel.


Can Nagios generate reports on CPU utilization?

Yes, Nagios can generate reports on CPU utilization, providing insights into historical trends and allowing you to identify long-term patterns.


Can Nagios monitor CPU utilization in real-time?

Nagios continuously monitors CPU utilization based on the defined check interval, allowing you to analyze near real-time data.


Are there any other Nagios plugins available for monitoring CPU utilization?

Yes, besides SNMP, there are other plugins available that allow you to monitor CPU utilization, such as NRPE (Nagios Remote Plugin Executor) or check_ssh.


Can I customize the CPU utilization thresholds in Nagios?

Yes, Nagios provides flexibility to define custom CPU utilization thresholds based on your specific requirements.


What other system resources can Nagios monitor?

Nagios can monitor various other system resources, including memory usage, disk space, network connectivity, and more, providing comprehensive insight into your infrastructure’s health.

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