Posted on : 20 May, 2021, 11:31:20 AM
Nagios is becoming one of the most widely used and popular tools for monitoring continuously. Since several companies and businesses are Since several companies and businesses are now more frequently releasing the software around the world than ever before; so there is a need for dire that can help monitor the software functioning and provide teams relevant and detailed feedback.
Nagios is also one of the ideal reasons that brought monitoring continuously into the picture, making the Nagios tool very important for implementing DevOps. With the rising need for Nagios and Nagios experts, interviews become competitive and tougher. So, Wissenhive decided to help our learning family by putting together all the frequently asked questions from fresher to experienced level questions during the Nagios interview after discussing with industry experts.
Refers to one of the best Nagios monitoring tools used for continuous monitoring of applications, business processes, services, and systems, etc., in the culture of DevOps. In the case of a failure, Nagios can alert technical staff about the problem, enabling them to create remediation processes before outages affect company processes, customers, or end-users. With Nagios, an individual doesn’t have to describe why an invisible infrastructure outage affects your business’s bottom line.
The two different types of state included in Nagios are
Nagios originated in the primary place to control and monitor applications, infrastructures, and networks. The software automatically has an immediate report and eagle eye in case of failure. It helped in the immediate response of the DevOps expert to follow down and resolve the problem in the very early stages before it can cause any severe damage to the business.
There are various databases that support Nagios, and some of them are
Plugins refer to a script such as Shell scripts, Perl scripts, and so on, which helps in running the command line to check the service or host status. Nagios only utilizes the actual Plugin's results to discover the current status of services and hosts on your network.
PHP+CGI is used for Nagios core, which requires Apache as a webserver to run CGI and PHP.
When an individual uses the Nagios for monitoring the Linux environment, they are required to understand that they are working with one of the best tools on the planet for monitoring purposes. The entire Nagios package is used for
Icinga is also referring to open-source software that is used for monitoring the applications and networks. The main aim of designing Icinga in the first place is to lift up the emergence of Nagios back in the year 2009, but it acts as a monitor software separately.
The full form of NRPE is Nagios Remote Plugin Executor, designed to allow users to perform Nagios plugins on remote Unix/Linux machines. The core purpose of doing this is to provide Nagios for monitoring local resources such as memory usage, CPU load, and so on. on remote devices or machines.
These public resources are usually not disclosed to external machines, an agent like Nagios Remote Plugin Executor must be connected and installed on the remote Unix/Linux machines.
The OIDs stands for Object IDentifiers that are used to define the detailed information, which is also recognized as Management Information Base or MIBs. The designs are extensible, so businesspeople can define their own objects to be monitored.
Both Logs and Configuration are always stored in a backend. NagiosQL stores configuration in the backend and ndoutils focuses on storing the historical data. In addition, users can also prefer using opdb and nagdb.
Yes, users can use Nagios for monitoring the window machine. However, if the users are working with it for the first time, then they should consider following two steps.
Passive checks are initiated and operated by external processes/applications, and the results of the Passive check are submitted to Nagios for processing.
Passive checks are valuable and useful for service monitoring that can't be effectively monitored by polling their status on a regularly scheduled basis and Asynchronous in nature. It also monitors the service that cannot be adequately checked by the monitoring hosts and located behind the firewall.
|Source||Active Checks||Passive Checks|
|Perspective||Active from perspective||Passive from perspective|
|Decides whether to respond and accept the message||Client decides||Server decides|
Currently, Nagios XI refers to one of the most popular and influential monitoring software all around the world market. When there is a need for critical monitoring of infrastructure, experts suggest using and rely on the Nagios XI software. Some of the critical infrastructures are
With the involvement of Nagios, users can observe and monitor the whole enterprise by utilizing a distributed monitoring scheme in which the instance of Nagios local slave performs two core activities, the reporting of the result and monitoring of tasks. Users can also control all notifications, configuration, and reporting while the slaves are doing all the work from the master.
The three main variables are
A Nagios network analyzer is one of the vital aspects of the software that permits it to do deep scanning of the entire system in search of any potential threat. The reliable and quick scan helps the system admin gather all the necessary data regarding the system’s health and granular data within network analysis.
The Nagios software supports various protocols, which includes
Nagios software is an object-oriented and open source monitoring software where an individual can design and build the object definitions in the Nagios, which are usually inherited by the other objects. This crucial and important feature of the Nagios further helps in simplifying the complicated connection between components.
There are three port numbers that Nagios uses for monitoring their clients.
Nagios software helps in supporting optional detection services and the host that are known as flapping. The situation of flapping in Nagios happens when a host or service changes their state too frequently, which results in a problem storm and recovery notifications. Flapping can be easily indicative of real network problems or configuration problems.
There are six different types of object that a user can witness in Nagios are
State Stalking is a term used for logging purposes. When Stalking is approved for a particular service or host, Nagios starts watching that service or host very thoroughly and logs any modifications it detects in the output of checked results.
Here, Wissenhive covered the top 30 Nagios interview questions with answers from beginner to advanced level to give the candidate a strong idea about interview questions that they might encounter during the interview.
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