It has a lot of flexibility for customization and a wide range of metrics. Also, it is opensource and has a big community.
Senior Manager of Engineering at a tech services company with 501-1,000 employees
The Reactor helped improved our script automation and self-response.
What is most valuable?
How has it helped my organization?
The Reactor helped improved our script automation and self-response. XI has provided us with top flexibility for heterogeneous systems monitoring.
What needs improvement?
Nagios needs to improve their incident manager. Currently, it isn't good for ITIL in my opinion. The Reactor is good to go, but XI needs to improve its reporting functionality.
For how long have I used the solution?
We use bothe Nagios XI and Nagios Reactor.
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Nagios XI
March 2025

Learn what your peers think about Nagios XI. Get advice and tips from experienced pros sharing their opinions. Updated: March 2025.
842,767 professionals have used our research since 2012.
What was my experience with deployment of the solution?
We have had no issues with the deployment.
What do I think about the stability of the solution?
There have been no performance issues.
What do I think about the scalability of the solution?
It's been able to scale for our needs.
What other advice do I have?
I would advise that you create a lab with Nagios Core and test what you really need. Although it's exciting to use all the products, only a few are really important in your IT structure. When you are confident with scripting and MIBS integration, you can consider expanding it to your Enterprise systems with Nagios XI and some other modules. I would discourage you from using the ticketing system to start with and choose something more dedicated.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Senior Systems / DevOps Engineer with 1,001-5,000 employees
It's easy to customize through scripts. The user interface needs to be improved.
Valuable Features:
In my experience with Nagios, I've found that the most valuable features are the scalability and extensibility through using scripts. It's easy to customize, and Nagios makes it easy to use languages you're already familiar with such as Bash/Python
Improvements to My Organization:
It's helped us improve as we now have the ability to customize the solution. By doing this through scripting, we are now able to monitor every layer of our stack from infrastructure to applications.
Room for Improvement:
I feel that the maturity and user interface needs to be improved. I think this is handled through its integration with OpsView.
Deployment Issues:
We have had no issues with the deployment.
Stability Issues:
There have been no performance issues.
Scalability Issues:
It's been able to scale for our needs.
Initial Setup:
If you plan ahead of time and thoroughly test the final solution you want to implement, it should be straightforward.
Other Advice:
Plan ahead and take your time through staging the installation and take your time testing your customized scripts before doing the production installation.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Buyer's Guide
Nagios XI
March 2025

Learn what your peers think about Nagios XI. Get advice and tips from experienced pros sharing their opinions. Updated: March 2025.
842,767 professionals have used our research since 2012.
CEO at a tech services company with 51-200 employees
It does exactly what we need: Alert us when something is wrong
We use Nagios because it does exactly what we need: Alert us when
something is wrong and (with PNP) show some trend to figure out when or
maybe how the problem started. The graphical output is for sure not
state of the art, but we are not artists but rather techs ;) As a hosting
business we have quite a homogenous infrastructure and use mostly snmp
for fetching data in our own scripts. Once the basic setup for Nagios
is done it is quite easy to automatically script new hosts when you add
new machines or delete the old ones. However your choice might be
different if you have to monitor IT of various customers with totally
different infrastructure.
And finally there are apps for android, iPhone, etc so with just one look at your phone you see if everything is well.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Network Engineer at a tech services company with 11-50 employees
Provides for better network visibility and identification of connection problems
Pros and Cons
- "The most valuable feature is its support for different types of devices, where it can use all of the equipment that you need."
- "I would like to see more customization in the network map because it is a bit tricky to use it."
What is our primary use case?
We use this solution for the monitoring of network devices in multiple areas. I use this solution on a daily basis, and the first thing that I do when I go into the workplace each morning is to check on all of the equipment.
How has it helped my organization?
This solution has improved our ability to determine the source of a connection failure in our network. Prior to using Nagios XI, we did not know whether the drop in service was a result of our system, or whether it was the fault of our service provider. Now, we are able to monitor the service provider's router and make that determination.
What is most valuable?
The most valuable feature is its support for different types of devices, where it can use all of the equipment that you need. You can find and change your speed in the network topology, and if something goes down then it will be noticed immediately.
What needs improvement?
I would like to see more customization in the network map because it is a bit tricky to use it.
First, when you click on one of the devices on the map, it shows you information about the equipment. Sometimes, there is information that I do not want to show. I would instead like to choose what is shown.
Next, I would like to have the ability to show only a subset of equipment on the network map. When you view it, all of the equipment that you have is there, every time. Sometimes, I would like to choose just a group of devices to view.
For how long have I used the solution?
Four months.
What do I think about the stability of the solution?
This is a stable solution. On a scale of one to ten, I would rate the stability a nine.
What do I think about the scalability of the solution?
The scalability is perfect. I can add as much equipment as I like.
How are customer service and technical support?
I have not needed to contact technical support. Everything installed easily and it works fine.
Which solution did I use previously and why did I switch?
We did not use another solution prior to this one.
How was the initial setup?
The initial setup is very straightforward.
The deployment took approximately one hour. The difficult part is configuring the equipment, such as setting up the IP addresses. Because I have more than fifty devices, it took me some time. The task is simple, albeit repetitive.
What's my experience with pricing, setup cost, and licensing?
The licensing fees for this solution are approximately $3,000 USD per year.
Which other solutions did I evaluate?
When I was researching solutions I read about Nagios XI, and it was rated as one of the best solutions. I tried it and I liked it, which is why it was selected.
What other advice do I have?
I would rate this solution an eight out of ten.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Manager of Infrastructure at a university with 10,001+ employees
It's helped us to improve our incident management, problem management, and capacity management.
What is most valuable?
It's ability to monitor a good range of services out of the box and it's extensibility with the use of plug-ins, with an active user community sharing community contributed plug-ins to cover monitoring for a very wide range of services and components.
How has it helped my organization?
It's helped us to improve our incident management, problem management, and capacity management.
What needs improvement?
The web interface is perfectly fit for purpose but isn't up there with the best modern admin panels. There is scope for improvement to make it more dynamic and responsive.
For how long have I used the solution?
I've been using it for three years.
What was my experience with deployment of the solution?
Nagios XI ships as a virtual appliance and is easily deployed.
What do I think about the stability of the solution?
There have been no performance issues.
What do I think about the scalability of the solution?
Clear instructions are provided on how to expand the disk capacity of the appliance and the solution can be scaled to allow several distributed Nagios monitoring instances to work together.
How are customer service and technical support?
Customer Service:
Customer service is excellent.
Technical Support:I haven't needed any technical support.
Which solution did I use previously and why did I switch?
We previously used the free version of Nagios and decided that the commercially packaged version Nagios XI was well worth the cost and reduced the admin overhead significantly.
How was the initial setup?
Initial setup is straightforward and allows monitored hosts to be added one-by-one using a wizard or added in bulk using the bulk add tool.
What about the implementation team?
An in-house implementation was done. I would advise that you need to understand the overall basic architecture of Nagios before implementing it.
What's my experience with pricing, setup cost, and licensing?
In my view this product is very good value for money when compared with other commercially provided monitoring solutions.
What other advice do I have?
Implementation is best done by people with a good general Linux/open source skill set. If you have these kinds of people then implementing Nagios should be fairly straightforward. If you have a bunch of Window admins who've never touched a Linux system, then implementation could be a challenge.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Storage System Integration R&D Engineer with 501-1,000 employees
Overall, it's a powerful system. Business services monitoring is still really basic.
Valuable Features:
It's simple and has easily understandable monitoring concepts that have been largely adopted by the community.
Improvements to My Organization:
Starting from proprietary monitoring systems, it becomes possible to customize the monitoring system to our specific needs thanks to custom developments and community contributions.
Room for Improvement:
Business services monitoring is still really basic. With the growth of IT environments, IT monitoring needs to be attached to the services organizations provide to customers. Also, it needs external automation tools may be helpful and there's no web API before Nagios 4.
Deployment Issues:
We have had no issues with the deployment.
Stability Issues:
There have been no performance issues.
Scalability Issues:
Configuration may be heavy in large scale environments.
Other Advice:
First learn concepts, and think how the solution could be suitable for your specific needs. Overall, it's a powerful system.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Account Manager, Cybersecurity at a tech services company with 11-50 employees
Open-source, with good monitoring and visibility
Pros and Cons
- "The dashboard allows you to see what's going on in the overall system."
- "Open-source software is usually not user-friendly."
What is our primary use case?
Nagios XI is used for monitoring the resources in the infrastructure.
What is most valuable?
The dashboard allows you to see what's going on in the overall system.
What needs improvement?
As it is open-source, it is not user-friendly. Open-source software is usually not user-friendly.
For how long have I used the solution?
We have been selling Nagios XI for more than five years.
What do I think about the scalability of the solution?
Nagios XI is a scalable product.
We have six customers who are using this solution.
How are customer service and support?
Support, we have a time zone issue, but we are providing our own support.
I don't believe we require anything, because we have our own technical expertise.
Which solution did I use previously and why did I switch?
We are resellers of Forcepoint and Symantec DLP.
How was the initial setup?
Because my company is experienced, installation is not a problem for us, but I'm not sure about new users.
We have a team of two or three people to deploy and maintain this solution.
What's my experience with pricing, setup cost, and licensing?
Nagios XI is open source.
It requires a yearly license.
What other advice do I have?
It is an alternative to more expensive solutions. That is why they use Nagios.
I would rate Nagios XI an eight out of ten.
Which deployment model are you using for this solution?
On-premises
Disclosure: My company has a business relationship with this vendor other than being a customer:
Manager - Cybersecurity Technology, Cybersecurity Technology Services at a tech services company with 51-200 employees
I can track systems behavior and network failures.
What is most valuable?
Simplicity of configuration. I can set up configuration of 100 devices with about 10 services in one to two days.
How has it helped my organization?
I can track systems behavior and network failures.
What needs improvement?
It's in need of more standard plug-ins.
For how long have I used the solution?
I've used it for around 12 years
What was my experience with deployment of the solution?
We had no deployment issues.
What do I think about the stability of the solution?
The product is quite stable, and we've had no issues.
What do I think about the scalability of the solution?
There's been no issues with scaling it for our needs.
How are customer service and technical support?
Customer Service:
I'm not using any customer service.
Technical Support:I'm not in need of any technical support.
Which solution did I use previously and why did I switch?
I started with this product.
How was the initial setup?
It's very straightforward initial configuration if you start with your distro packages.
What about the implementation team?
It's very easy, and you only need to familiarize yourself with its file structure. Sometimes you need to write your own plugin, so sometimes it is better to have it implemented by a vendor.
What other advice do I have?
It's very simple, and is very valuable to us. If you need to monitoring your environment just do it
Disclosure: I am a real user, and this review is based on my own experience and opinions.

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Updated: March 2025
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Nagios is a very useful tool for system administrators, which provide good monitoring for network and servers. It's free and from my point of view it's fast and efficient. Nagios is stable and has many plugins available for monitoring. The software is robust, but, as a con, is an absolute pain to configure it. There is a very intuitive dashboard page that the administrator can leave open on an extra monitor to view at any given time and it will even rotate between different pre-selected views if the administrator likes that.