Nagios Monitoring Tool & Its Features

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 Nagios Monitoring Tool and Features 

Hey Folks,

Here is one of the best monitoring software in the market, which can monitor applications, networks, servers, memory, URL, HTTP, content, microprocessors, and many more.

Why Nagios called Nagios:

Nagios is a recursive acronym: "Nagios Ain't Gonna Insist On Sainthood" – "sainthood" (पवित्रता) makes reference to the original name NetSaint (कोई संत नहीं), which changed in response to a legal challenge by owners of a similar trademark. "Agios" (or "hagios") it transliterates the Greek word άγιος, which means "saint".

Nagios Monitoring Tool

What is Nagios?

Nagios is open-source software for continuous monitoring of systems, networks, and infrastructures (windows machine Linux machine, network devices, switches farewell, router, etc). It runs plugins on a server that is connected with a host or another server on our network or the Internet. In case of any failure, Nagios sends alerts about the issues so that the technical team can perform the recovery process immediately.

Nagios is used for continuous monitoring of systems, applications, services,s and business processes in a DevOps culture.

Nagios

Why do we need Nagios?

Here are some of the important reasons to use the Nagios monitoring tool:

  • Detects all types of network or server issues and sends alerts.
  • Open Source, relatively scalable, Manageable, Secure, and more.
  • Best Documentation available along with a Nice, informative, and attractive web interface.
  • Good log & database system and it is very flexible.
  • Helps us to find the root cause of the issue which allows us to get a permanent solution to the problem.
  • Active complete monitoring of our entire infrastructure and business processes.
  • Also helps you to monitor and troubleshoot server performance issues.
  • Helps us to plan for infrastructure upgrades before outdated systems create failures.
  • we can maintain the security and availability of the service
  • Automatically fix problems in a panic situation

Nagios Flow

What can Nagios Monitor:

Nagios can do application monitoring, network monitoring, server monitoring, memory usage, disk usage, URL monitoring, HTTP status, content monitoring, hijack detection, microprocessor load, currently running processes, generating the log files,

it also monitors services, such as Simple Mail Transfer Protocol (SMTP), Post Office Protocol 3 (POP3), Hypertext Transfer Protocol (HTTP), and other common network protocols such as monitoring routers, switches, and more.

What Can Nagios Monitor?

Nagios Versions:

  • Nagios core is fully open source
  • Nagios XI enterprise edition, Free trial for 60 days.

Nagios Architecture:

Nagios is a client-server architecture. Usually, on a network, a Nagios server is running on a host machine, and plugins are running on all the remote machines which should be monitored.

Nagios Process Flow

  • The process scheduler is a component of the Nagios server. It sends a signal to execute the plugins at the remote machine.
  • The plugin gets the status from the remote machine.
  • The plugin sends the data to the process scheduler as a response.
  • The process scheduler updates the GUI and notifications are sent to admins if there is any issue.
Nagios Architecture 

How does it work?

  • Mention all details in configuration files.
  • Daemon read the details of what data is collected.
  • Daemon uses NRPE plug-in to collect data from nodes and store it in its own database.
  • Finally, store everything database and display it on a webpage.

Plugins

Plugins are the only extensions/agent to Nagios Core that makes it possible to monitor anything and everything with Core.

How does it work?

Plugins

Nagios Dashboard (Web bases GUI of Nagios):

Below screenshot is having GUI of the Nagios Dashboard, from the left panel you can check host details and Services details which are monitored by Nagios Tool.
Nagios Dashboard Configuration?


Nagios Dashboard

Nagios Core Configuration

Go to the host tab and you will get all the host details which are attached to the Nagios tool for monitoring.

Nagios Host 

Go to the Services tab and you will get all the services that are monitored under each host by the Nagios tool.

Nagios Services

Configuring Client Node (NRPE Agent):

Installing the Nagios Plugins into the local system or remote system for monitoring, it is also called client node configuration.
NRPE Agent Configuration?

NRPR Agent Configuration

NRPR Agent Configuration

Alerting in Nagios:

Email Alert Configuration?

Email Alert

Email Alert Configuration 

Configuring NSClient++ on Windows (check_nt plugin):


NSClient++ 

NSClient++ Configuration

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Thanks & Regards,

Kanchan Soni (https://linktr.ee/kanchansoni)

(A girl who saw the dream with an open eye to compete with self-capability in the area of IT and its Next-Gen Technology, with the ability to complete the task with perfection.)

Email: kanchansoni.cse@gmail.com

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