Nagios is really very good from the configuration point of view. If you have a hefty budget, go with Nagios XI else Nagios Core is equally good. Just you need to put a lot of effort to configure & monitor everything.

On a scale of one to ten, I would give Nagios Core a 10 out of 10.

I would rate this solution nine out of 10.

I rate the solution a nine out of ten. 

I tell people to go for it. It really works well. The community version is free of charge, and it's not that difficult to set up and use.

Overall, I would rate the solution a ten out of ten. 

When considering Nagios Core you should consider how many servers, firewalls and routers you need to monitor. Then determine which services need to be monitored by Nagios Core and how many service alerts are needed so you can create clusters and keep your gig size and RAM size accordingly.

I would rate Nagios Core a 7 out of 10.

I rate the solution an eight out of ten. The solution is good, but the initial setup process could be easier. I recommend the solution to users who want a more diverse environment for monitoring.

I would recommend Nagios Core for CentOS organizations, especially for simpler evaluations or smaller projects where a significant investment isn't required. It is suitable for those without extensive monitoring needs. Overall, I would rate the solution as a six out of ten.

I would rate Nagios Core a nine out of ten.

Nagios Core is a world-famous open-source monitoring tool. It is easy for us to showcase a Nagios Core demo to the client.

Overall, I rate Nagios Core ten out of ten.

Nagios Core is a good tool overall, and I would rate it at six on a scale from one to ten.

We have the ability right now to see and create reports to tell whether or not we're meeting our SLAs on our production servers, through it. That is something that we wrote and implemented as a plug-in.

I would rate this solution a nine out of 10 because it's relatively easy to implement and the cost is great, it's free.

My advice would be, save yourself a lot of time - go get it and install it.

To really maximize the power of Nagios, you need an SME (but true if anything in IT).

I recommend this solution because it's very easy to use. There are good resources available online and we can do everything we need.

I rate this solution nine out of 10. 

This solution can meet basic requirements. If someone is using it on a larger scale they might have difficulty managing it.

I rate Nagios Core a seven out of ten.

This is a fit for purpose product which means that if you have a definite list of requirements and are not willing, or unable, to spend money on big enterprise tools, then Nagios is a tool to go to. Also, any changes to the customization means that you need to have the skill sets internally within the organisation to effectively use it. Otherwise it's a great open source product.

I would rate the product a six out of ten. 

I would recommend it to others. It does what it is supposed to. It is pretty good. 

I would rate it an eight out of 10.

There are thousands upon thousands of plugins. This is a winning product. Nothing can match the plugins, even I have contributed about six plugins.

The free version of the solution does not have an interface, but the paid version does.

I would recommend this solution to others.

I rate Nagios Core an eight out of ten.

I rate Nagios Core seven out of 10. Nagios Core is not easy to use, so I don't recommend it for everyone.

I would rate Nagios Core as seven out of ten because it was hard to configure and the implementation process itself took about two weeks. Also, the UI is not friendly. Other products have features that aren't included in Nagios Core. I think that one was the easiest to restore. Also, Nagios supports only Linux, not A/UX. It can't be installed on the servers. If they supported all of these things, it would be much better.

It's well worth it to ensure your up time and to catch the bigger issues.

You should really try Nagios. It will help a lot and I have found that it is the best buddy for system admins.

Nagios Core is a great solution for monitoring pretty much any size of deployment but you do need to know your way around a Linux system to set it up and run it. The skills you need include knowing the Apache setup on your chosen distro, configuring and compiling GCC tarballs and some idea about configuration syntax. Adding NagiosQL makes it simpler but that also needs some fettling to get it to work reliably. It also helps to be good with Windows administration though chances are that if you are looking at this sort of thing, you may be aware of that. Nagios does not detect systems out of the box and while it can be made to use WMI, it tends to be better working with the NSClient++ service on Windows which can be made to work much like the NRPE service which does the same duties under Linux and Unix.

We're just customers and end-users. We don't have a business relationship with Nagios.

We're using the latest version of the solution.

We're still in the early days in terms of usage. We're still feeling the solution out and testing it for its acceptability within the greater framework of our organization's requirements. We're looking to test it at the point of sale to see how successfully it operates.

Overall, I would recommend the solution to other organizations.

I would rate the solution eight out of ten.

In terms of advice, I'd say that you need to know what the plan is and try to understand from which direction you are going to monitor. And, to understand what additional things you'll probably want to do from your side, like putting in scripts and other kinds of automation. So the planning is everything. If there is a particular tool you want to integrate with those things have to be properly planned beforehand.

With the number of features that it has and the ease of integration, I would rate the solution somewhere close to nine out of ten.

You should go ahead and try it.

The product is robust and reliable. The notifications can be customized so that I can even configure it to send the notifications via WhatsApp! Last but not least, the reporting feature is very easy to understand, which is good when presenting to my boss.

Don't use it. If Nagios is what you already have, you can try keep using it. If you're starting from scratch, there are products that scale better and perform better, and they use the same plugin syntax as they were initially Nagios forks.

Its an awesome product to use. 100% recommended for all organizations.

Take your time to understand how it works. Then start monitoring a small number of assets in your department and then add some device/server every day. It takes some time to tune all your checks. Once done you'll have almost everything under control. I even managed to adapt some plugins to suit my needs.

Nagios is a good choice for network monitoring. It's up to you decide if you need assistance of skilled people or try it by yourself. I was curious about Linux and Nagios was a good reason to start working with it.

Use the Nagios community, and go for the basic product. Design your system configuration before installing the product.

Definitely try it out if you have zero budget 

Even if you don't have a budget restriction please do give it a try

There is a large Nagios community for new sensors, etc.

Though the core nagios system is still very challenging to install, a lot of bundled installers with very good GUI's for configuring nagios now exists. Instead of doing everything manually from the command line, you can just grab one of these packaged forks and get started with nagios in as little as 10 minutes.

I would recommend it for small network deployments or if you have other open source applications or other metrics like utilization, CPU. So if you're running alongside other open source applications and in the small space, it works. But anything beyond that is not recommended.

I would rate Nagios Core a six out of ten.

The free version is good enough for most people, but it is somewhat hard to make it a working solution.

As a rule, any device upon delivery is obsolete. Pick up the solution for your business, based on your specific needs.