NAGIOS Interview Questions for freshers experienced :-
1. What is Nagios?
Nagios commonly known as the Nagios core is the open-source software that is designed to monitor networks, systems, applications, and infrastructures. The software directly sends the track down all the changes in the subject and send alerts if necessary.
2. How Nagios help DevOps professionals?
Nagios was designed in the first place to monitor applications, networks, and infrastructures. The software automatically keeps an eagle eye and immediately report in case of failure. The quick response helps the DevOps professional to track down and resolve the problem in the early stages before it can cause any serious damage to the organization.
3. What makes Nagios an ideal tool for continuous monitoring?
The below features of the Nagios is what makes it an ideal tool for continuous monitoring:
- Automatic problem fixing
- Infrastructure upgrades
- Business process and infrastructure monitoring
- Quick respond to the system issues
4. Write down some of the names of the Nagios monitoring tool for Linux mentoring?
When you are using the Nagios to monitor the Linux environment then you need to understand that you are using one of the best tools on the planet. The complete package of Nagios includes service state, file system usage, system metrics, process state, and more.
5. How Icinga is related to the Nagios?
Icinga is also open-source software that is used to monitor the networks and application. The core objective of designing Icinga in the first place to lift up the Nagios back in 2009. But it works as a separate monitor software.
6. Describe the active and passive check in Nagios
In the Nagios, an active check is leveraged to “poll” a service or device for the status information every once in a while. Nagios basically supports the way to host down the devices and services passively. The key feature of the passive check is it can only be performed by the external applications.
7. Explain OID Nagios?
Simple Network Management Protocol (SNMP)- a network protocol which is also designed for the monitoring purpose uses the Object Identifiers to define the Management Information Base.
8. Can you use Nagios to monitor the window machine?
Yes, you can use Nagios to monitor the window machine. However, if you are doing it for the first time then you have to follow the given steps:
- Set the Nagios to monitor the window system
- Add a separate host and server for the window monitoring
9. Describe the Nagios XI?
On the current basis, Nagios XI is one of the most powerful monitoring software in the market. when it comes to monitoring critical infrastructures such as network protocols, applications, services, systems metrics, and network protocols experts only relies upon the Nagios XI.
10. Highlights the benefits of using Nagios for monitoring?
There are various benefits of using Nagios software for critical monitoring. The list of benefits includes:
- Infrastructure updates before the outdated system cause any sort of failure
- Automatic tracking and troubleshooting of problem
- Coordinate responses
- Continuously Monitor infrastructure without any break
- Response to issues on an immediate basis
11. what active check means?
Active check is the globally recognized way to monitor the hosts and services. Both Nagios XI and Nagios core use it on the pre-determined schedule.
12. Describe the Nagios Network Analyzer?
A network analyzer is a crucial aspect of the Nagios software that allows it to deeply scan the entire system in a search of any potential threat. The quick and reliable scan allow system admin to gather necessary data regarding the health of the system and granular data through network analysis.
13. Highlight the primary benefits of monitoring the websites with Nagios?
The key benefits of monitoring websites with Nagios are given below:
- It enhances the website availability
- Increase website performance
- Quick detection of online threats such as bugs and hijacking
14. Name down some databases that support Nagios monitoring?
There are a number of databases that support Nagios and some of them are mentioned below:
- Oracle
- MySQL
- Microsoft SQL software
- Postgres
15. Write down the protocols that support Nagios
Nagios supports the number of protocols monitoring including; SMTP Monitoring, IPMI Monitoring, FTP Monitoring, LDAP Monitoring, POP Monitoring, and DNS monitoring.
16. what do you understand by the fact that Nagios is object-oriented?
As already mentioned above, Nagios is open-source object-oriented monitoring software. Here the term “object-oriented” means that users can create the object definitions in the Nagios that inheritance from other objects. This essential feature of the Nagios further simplifies the complex relationship between components.
17. Can I use Nagios for both cloud computing and cloud monitoring?
Yes, the Nagios has a reputation as one of the best monitoring software in the market and you can use it for various monitoring purposes including both virtual and physical.
18. state the name of any four virtualization platforms that supports Nagios?
VMware, Amazon EC2, Xen and Microsoft Virtual PC are some of the most common examples of the virtualization platforms that support the Nagios monitoring.
19. Do you know the port numbers Nagios use to monitor its clients?
Yes, the Nagios uses port number; 5666, 5667 and 5668 to monitor its clients.
20. Describe the process to verify the Nagios configuration?
If you want to configure the Nagios, then you have to run it with the -v command line with option like: nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg.
21. Define the objects in Nagios?
In the Nagios, objects refer to all the elements that are involved in the entire monitoring and alerting logic.
22. What are the types of objects you can witness in Nagios?
The types of objects you can witness in the Nagios includes; Services, Hosts, commands, host groups, contact, time periods, and notification escalations.
23. How can you use plugin X in Nagios?
Just like any other plugin, you have to download plugin X from the official website of Nagios which is https://exchange.nagios.org/. Once downloaded, you can run it manually to see if it is working correctly.
24. When it comes to monetary terms what is the main difference between Nagios Core and Nagios XI?
Well, when it comes to monetary terms, Nagios Core is the free open source version while Nagios XI is the paid version limited to the individual who held the license.
25. What is the current Nagios state type?
On the current basis, the monitoring host and services are determined by the two major components
- First: Status of the host and service
- Second: Types of the state the host or service is in
26. What are the two main state types in Nagios?
The Nagios have two key state types; soft states and hard states.
27. Define NRPRE in Nagios?
The term NRPE stands for the Nagios Remote Plugin Executor addon which is specifically designed by the experts to execute Nagios plugins on the Linux machines.
28. What database format Nagios support to store status data?
RRD is the database format Nagios support and uses to store the status data.
29. Write down the components of NDO Utilities?
The NDO utilities are the right mixture of the:
- NDOMOD Event Broker Module
- FILE2SOCK Utility
- LOG2NDO Utility
- NDO2DB Daemon
30. Can we monitor the operating system through Nagios?
Yes, you can monitor any operation system through Nagios as long as it supports the software.