Nagios is an open source application that monitors for computer network problems so that they can be fixed more quickly. Nagios was designed for use with the Linux operating system, but it will also work under Unix and most Unix-based systems.

Nagios runs periodic checks on user-specified resources and services. Resources that can be monitored include memory usage, disk usage, microprocessor load, the number of currently running processes, and log files. Services that can be monitored include Simple Mail Transfer Protocol (SMTP), Post Office Protocol 3 (POP3), Hypertext Transfer Protocol (HTTP), and other common network protocols. The program can monitor environmental variables such as temperature, humidity, or barometric pressure in conjunction with the appropriate measuring hardware. A user-friendly Web-based graphical user interface is provided. An authorization system allows the administrator to restrict access as necessary.

Nagios has proven popular among small businesses. Other users include Internet service providers (ISPs), educational institutions, government agencies, health care institutions, manufacturing companies, and financial institutions. Previously called NetSaint, Nagios was developed by Ethan Gelstad and refined by numerous contributors..

This was last updated in August 2005
Posted by: Margaret Rouse
View the next item in this Essential Guide: VMware Tools or view the full guide: The VMware infrastructure monitoring encyclopedia

More News and Tutorials

  • Getting a handle on UCS: Vendor lock-in, interoperability and implementation

    The shortfalls of UCS include the potential for vendor lock-in and interoperability issues. Learn more about these and what you need to know to deploy a UCS in your data center. Some implementation considerations include storage, hypervisors, and a contingency plan in case your vendor changes course.

  • Getting a handle on UCS: Advantages and costs

    Unified computing systems (UCS) hold the promise of simplicity for data center, but the technology and associated costs may not be appropriate for every application. Learn about the potential of UCS to help your data center, and what you should consider prior to implementation.

  • Linux update on IBM System p

    Most machines running Linux are x86 PCs. IBM's System p and Linux go well together, and Ken Milberg explains why and what's new. He gives five reasons to run Linux on System p, and shares some of the options for PowerVM, IBM's virtualization platform.

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

Research More Tech Terms

  • Search thousands of tech definitions
  • Browse tech definitions
    Browse Alphabetically:

Powered by

File Extensions and File Formats

File Extension and File Formats List:

Powered by