Nagios Core 4.5.9 on CentOS 10

I am using Nagios Core on CentOS  for monitoring, and it is primarily used for monitoring the IT infrastructure like servers, applications, and network devices. It will provide alerts and performance status, so I can detect and resolve issues before they become critical.

For the servers, we have already configured Nagios Core on CentOS , so it will help me to monitor CPU usage, MySQL  database availability, network latency between CentOS  and external endpoints, SSL certificate expiry, and performance visibility. I can set up alerts and see the same in the dashboards, response time, and all those things. It will also help me monitor the web server.

Regarding a customized challenge, there was one case scenario where the server was continuously hanging, which caused many issues for our customers. During that time, we set up Nagios Core on CentOS on the CentOS  server. We got a real-time scenario and provided some particular use cases and critical scenarios. In that case, it helped us a lot to find out what the issue was. Other than basic monitoring, we can use custom plugins. I was able to run my scripts in Python, and it helped to do disruptive monitoring. Also, whenever Apache fails, it will automatically restart Apache or clear the cache whenever a memory spike is happening. We can check this during batch jobs that were scheduled at night. We set up a particular scenario where it should allow higher CPU usage during the batch jobs at night. It helped with the integration with Grafana  for visualization, so it helped a lot. We also group multiple checks into a single business service. For example, the e-commerce site depends on the web server, database, and payment gateway. It helped to run all those things. This is the main scenario regarding the custom plugins, event handlers, and integration with Grafana  to visualize the response time across the services and group all services into the business process called customer portal. We know if the entire app is healthy or not.

Regarding monitoring, it is a common feature with Nagios Core on CentOS. The best features I felt were the extensive plugins. There were hundreds or thousands of readymade check plugins. It is the ability to write my own scripts for anything unique to my environment. The main feature is that I get notifications by email, SMS, or integration with escalation policies, so the right person gets the right alerts at the right time. That is the main thing. The web interface, particularly the Nagios Core on CentOS dashboard, is user-friendly, and we are able to view the status, logs, and trends. That helps us a lot. It also automates fixes. For example, as I said before, if the high CPU usage comes in the night, it will allow it. If any particular batch jobs are running, it will allow the high CPU usage, and it helps to automate the restart of services, clear cache, or trigger scripts whenever an issue arises. It also scales across multiple sites and data centers, feeding results into the central Nagios Core on CentOS instances. Also visibility and control. The dashboards and reports give us a clear picture of the system's health, so it helps a lot. Mainly, as it is open-source software, it is free to use, and these many features are included, so it is a value-added thing. Our customer was very happy because he is very concerned about the budget. Due to that, he needed a free tool, so Nagios Core on CentOS helped us a lot to accomplish his requirement with great satisfaction.

Nagios Core on CentOS is very stable, and we are very happy about that one.

Nagios Core on CentOS is very scalable because whenever new servers have been added, we can add the service without any issues. It reduces repetitive configuration when monitoring hundreds of hosts and services. Multiple Nagios Core on CentOS instances can monitor different regions and data centers. It helped a lot. Because of this, it improves performance under heavy loads. It also automates fixes and prevents manual interventions. It helped a lot, and we are very happy about Nagios Core on CentOS's scalability and efficiency.

I will definitely refer Nagios Core on CentOS. First of all, it is free software. Second, it is reliable and scalable. It is very scalable whenever we are adding new services and features. Because of that, we do not need to worry. If we configure everything at the first time, we do not need to spend so much time on Nagios Core on CentOS. Because there are no license costs, it is ideal for startups and mid-sized companies. One of my friends has a startup company, and I referred Nagios Core on CentOS to him. Because of the thousands of plugins, he is very happy about it. Because of the monitoring, flexible alerting, and scalability, I will definitely suggest Nagios Core on CentOS to others.

Regarding this review, you have asked about the Nagios Core on CentOS integration. As I said before, because of the high reliability, high scalability, the plugins, and overall being open source, it helps a lot to monitor our systems, and it helps us a lot regarding our proactiveness.

Regarding complexity, I think there is no feature like InfluxDB  AI, so it may require more expertise to configure. There are also some migration challenges in adopting the new dashboards, so it takes some time to train the staff, but it is not a big concern. I think it is better to add some advanced features. I do not think there are so many things that need to be improved in Nagios Core on CentOS. If it is better to customize the dashboard or if we can get something like a modern view, it will be helpful for the dashboard. I felt very happy with Nagios Core on CentOS.

Why I took off one point is that I think it is better suited for a small or medium setup. If large enterprises can use Nagios Core on CentOS, it will be helpful. It also requires manual editing of the config file, so it is a little bit time-consuming. The web interface is functional, but compared to some other latest AI monitoring platforms, it is a little bit lacking. I think the AI platform would score higher, but it is good. The reporting is just basic, so if we compare it with Grafana, it needs richer insights.

At most times, we did not reach out for customer support because there are community forums. Active users were posting newer issues, and they will post the solutions also. Community forums helped us a lot. Because of the documentation regarding installation, configuration, and troubleshooting, it helped a lot and avoids confusion. In recent times, we did not contact Nagios Core on CentOS customer care. We usually use the community forums, documentation, etc.

I think we have used Datadog  for monitoring. It cost around, I do not remember how much, but it is more than $1,000, within $1,000 to $5,000, I think. Because of this, we were able to save that much money.

Nagios Core on CentOS is not just a technical tool. I feel that it helps the business grow a lot by reducing downtime and improving visibility. Because of this, we were able to perform proactive actions, which strengthens both operational efficiency and customer satisfaction. Previously, we were manually monitoring everything, so it caused many issues and manual errors, and we lost a lot of time. Automatic monitoring helps us to save many hours per week for the system admins. Because of the instant alerts, it helped us find an issue within minutes. Otherwise, it would take hours to find it. Problems are detected and reported immediately, which helped a lot. Because of the automation, automated recovery actions such as if an HTTP service or some other service fails, it will restart automatically. It can cut the troubleshooting time, so we can avoid P1 and P2 issues, and later we can check the logs and find the issues. We use the time to find the reason. It helped us a lot in improving efficiency and our mental health. The dashboard, as I said, was very clear and good. It is one interface for all hosts and services, so it is a best feature, and it saves time compared to logging into multiple systems. Reporting  automation also helps us keep the SLA and uptime reports. Uptime reports are generated automatically, so it saves us from gathering manual data. Before Nagios Core on CentOS, we spent around ten to fifteen hours per week on manual checks for all services and everything. But after Nagios Core on CentOS, because of the automation, it is reduced to two to three hours. I think that is roughly forty to fifty hours per month.

It is deployed on-premises as well as in the cloud. We are using Nagios Core on CentOS in the AWS  cloud. We are also using it on-premises. On the basis of cloud, we are using Nagios Core on CentOS on AWS . We have directly deployed Nagios Core on CentOS in AWS.

Regarding Nagios Core on CentOS, it is completely free. So we do not need to spend any money on that one. I think Nagios XI  has some payment, but I have not used it until now, so it did not cost any money for spending on Nagios Core on CentOS. I think everything is good regarding Nagios Core on CentOS.

If it goes well this way and if Nagios Core on CentOS can keep the stability regarding the licensing, meaning the free software, the scalability, and the additional thousands of plugins, if Nagios Core on CentOS keeps improving as they have done for these many years, we are very happy about that. I am very happy to continue the Nagios Core on CentOS usage to monitor my service and do the scalability. It will help me a lot to find out the issues, and it helps me regarding my proactiveness. I give this product a rating of nine out of ten. Please continue maintaining this high standard, and I am very happy about Nagios Core on CentOS usage.

My main use case for Nagios Core on CentOS  is for monitoring purposes, primarily infrastructure and application servers. I rely on it most for managing and deploying our application servers, some applications, and storage.

In my environment, Nagios Core on CentOS  is set up to monitor web services and infrastructure level. If anything goes down, Nagios Core  notifies me via mail for the server, the particular service, and anything at the infrastructure level, so I receive notification and we fix the issue as soon as possible according to the priority level.

We are moving forward from Nagios Core  to an agent AI, and we are thinking about how to integrate Nagios Core with AI and monitor all aspects to easily manage everything.

Nagios Core on CentOS has positively impacted my organization because if there is any issue from the infrastructure side or application-wise, it automatically sends me a notification if something goes down, allowing us to easily and quickly solve the issue as soon as possible. This makes it a good option with multiple alerts available through mobile alerts, mail, and Slack messaging tools.

Since using Nagios Core on CentOS, I have noticed specific improvements in downtime and how quickly my team can respond to issues. Previously, without Nagios Core, we were digging into issues to find the root cause. Now when I install and configure Nagios Core, all the prerequisites are defined in the configuration, so if anything goes down, such as services that need to be monitored and examined all the time, I just need to configure it accordingly. If it goes down, it automatically sends a notification for these services, particularly if memory or disk space goes down, and we check the logs and fix it accordingly, which has led to a very significant improvement in downtime.

The best feature of Nagios Core on CentOS is that it is open source with many plugins available for installation and monitoring. If any application server or service goes down, we can take care of it very easily and configure it accordingly.

Plugins have helped my team significantly, particularly the database MySQL  plugin and numerous other plugins for SVN and other applications.

Nagios Core on CentOS has positively impacted my organization because if there is any issue from the infrastructure side or application-wise, it automatically sends me a notification if something goes down, allowing us to easily and quickly solve the issue as soon as possible. This makes it a good option with multiple alerts available through mobile alerts, mail, and Slack messaging tools.

Since using Nagios Core on CentOS, I have noticed specific improvements in downtime and how quickly my team can respond to issues. Previously, without Nagios Core, we were digging into issues to find the root cause. Now when I install and configure Nagios Core, all the prerequisites are defined in the configuration, so if anything goes down, such as services that need to be monitored and examined all the time, I just need to configure it accordingly. If it goes down, it automatically sends a notification for these services, particularly if memory or disk space goes down, and we check the logs and fix it accordingly, which has led to a very significant improvement in downtime.

Nagios Core on CentOS can be improved by making it easier.

Specifically, I would prefer the configuration and interface of Nagios Core on CentOS to be easier, more easily configured, and have an easy UI-based way to monitor all aspects.

I would add that it needs to improve in several areas, for example, if the UI were changed to show the interface in a GUI that is metric-based. There are many things that need improvement in my opinion, especially if the UI needs to be changed.

I have been using Nagios Core on CentOS for around five years and CentOS  for around ten years.

In my experience, Nagios Core on CentOS is stable, and there are no issues.

Nagios Core on CentOS scalability is easy, making it simple to scale up as my organization grows and needs to monitor more servers or services.

Before using Nagios Core on CentOS, I do not particularly remember which tool I was using previously, but I found it easy to configure Nagios according to my needs in my environment.

I chose a rating of eight out of ten because some things need to be improved at the UI level, and there are some configuration areas that I do not recall at this time, but the UI-based components and some configuration parts need improvement.

Since using Nagios Core on CentOS, I have seen a return on investment, specifically in the form of money saved and time-saving.

I have not been involved in the pricing aspect of Nagios Core on CentOS because another team handles the pricing and related matters.

Before choosing Nagios Core on CentOS, I evaluated other options including Prometheus.

My advice for others looking into using Nagios Core on CentOS is that it is easy to configure and manage services at the infrastructure level, including all infrastructure in Windows, Linux, and macOS, effectively capturing all logs and metrics and monitoring the services that are required, which can be set up accordingly. I would rate this solution an eight out of ten.