Configure Nagios To Send Email Alerts – In the last video I have provided instructions on how to install Nagios basic configuration. And monitor your network. Today, I’m going to show you how to configure Nagios for email notifications that can be associated with specific services for specific administrators.
Before the installation begins We need to set up an email forwarding server on the Nagios server which is used to send automatic emails upon notification.
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Open or create a file /etc/postfix/sasl/sasl_passwd and add the SMTP host, username and password information: save password locally /etc/postfix/sasl_passwd
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When finished All you need to do is enter the email address you want to use for notifications. Provide a contact section and specify the email address that should be notified.
W = alarm in dangerous state c = alarm in critical state r = recover f = start/stop flapping d = alarm in down state u = alarm in unreachable state s = alarm in stop state
You are now ready to proceed. The next section defines the contact group. Contact groups make it easier to group people together to notify specific people of specific events.
Each group has a specific user (or users) associated with it who will be notified if there is a problem.
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Once you have defined all your groups. Save the file and close it. Now you need to attach the group to a service so that the group will be notified if something goes wrong with a specific service. To do this Lets open the file…
After making changes, restart Nagios. You can test notifications through the Nagios web portal. Follow these steps:
Click “Services” on the left menu. Click on the failed service (yellow) in the main area. Click “Send Special Service Alerts” in the right menu. Type in your custom “Comment” and click the “Confirm” button. Check your inbox for notifications. via email If you don’t understand Check the server logs to see if there are any system issues on the Nagios server. This is a multi-part Nagios article series focusing on the full Nagios monitored network configuration. Find all related articles here.
Nagios has the ability to send emails to contacts. (email address) and a group of contacts when the event occurs. This article shows you how to notify a contact.
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The files that we will be focusing on are the “/etc/nagios/objects/contacts.cfg” The default contacts file looks like this:
We need to change the file “/etc/nagios/servers/clients.cfg” to determine who The contact group (or contact group) should be notified when this happens. Here’s an example of how we edit “Services”:
The above shows that the group “Administrators” will be notified when there is an event that causes the service to “load CPU in 5 minutes”. Do the same for each service you want to monitor.
Still in file In “/etc/nagios/servers/clients.cfg” we need to add the contact to the “host” list. Here is an example of how we do it. The only difference is that I don’t want the group to be able to contact if there is a problem with a specific host. I would like to notify a specific person (by email).
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The above information indicates that the contact (Not a group, but a specific contact) “webadmin” will be notified of events affecting this host. Do the same for other hosts and specify which hosts or host groups should be notified about the event.
After making changes, restart Nagios. You can test notifications through the Nagios web portal. Follow these steps:
Check your inbox for email notifications. If you don’t understand Check the server logs to see if there is a system issue on the Nagios server. Imagine having a daily report that seamlessly fetches data from the DB when something goes wrong. This is not a happy idea. But it can get worse if you don’t realize it. Detecting and fixing problems before they occur has many benefits, such as saving organization time and money. Prevent system downtime and negative effects and avoid dissatisfied customers Once monitoring tools are set up, alert you to issues before they affect your customers. You can fix them before they cause problems for you and your customers. This is where the Nagios Core comes into the game.
Nagios Core is a popular Linux-based open source system and network monitoring application with the ability to notify you when problems occur and when problems are resolved. Nagios Core provides basic monitoring functionality. and manage your IT environment. because it is an open source model There are so many plugins available for Nagios and this tool can be easily adapted to your needs. In addition to the benefits of accessing the source code for customization and debugging. Flexibility also affects its popularity.
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You can write a plugin. (check command) to check almost any type of system or service you might have in production. No matter how customized it is, Nagios doesn’t limit what it can check.
The notification method doesn’t integrate directly into the Nagios Core code because it’s pointless. Nagios Core’s “core” isn’t designed to be a fully integrated application. There are many ways to notify and there are many packages that can handle it.
SendGrid is a third-party service that supports sending emails. If you install Nagios Core on an Azure VM, the supported way to send email to external domains from Azure resources is through the SMTP relay service. Customers who create Azure subscriptions after November 15, 2017 have technical limitations such as: Blocking emails sent directly from the VM to the email provider The reason for this is that there is no dedicated IP address and it is quite possible that the spammer uses Azure to send spam. The spam blacklist quickly flags Azure data center IP ranges as spam sources. in other words Valid emails will stop working.
Because Microsoft cannot guarantee that your email provider will receive this incoming email. Therefore, a request to remove the restriction cannot be made. Fortunately, we were able to use SMTP relay to solve this problem, and we chose SendGrid. The reason we chose SendGrid is that Azure customers can unlock 25,000 emails per month for free. SendGrid is easy to configure. Offer reliable transactional email delivery. scalability Real-time analytics along with a flexible API that makes custom integrations easy. And there are binding extensions for Azure Functions. There’s also lots of documentation and examples online.
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So far, we have a validation tool that detects issues, and we have SendGrid to send emails to interested users. Now, we need to let SendGrid know when to send emails. and for this purpose We use Azure functions.
Azure Functions let you run code in a serverless environment. without creating virtual machines or publishing web applications. The idea behind a serverless environment is to delegate server management and maintenance to a third party. so developers can focus on specific business needs. One of the advantages of the serverless approach is cost savings. Because you only pay for what you use.
Azure Functions are great for event processing. So the perfect scenario to use Azure Functions is if you have built a model around events. You will use HTTP triggers.
Covering the entire procedure is beyond the scope of this post. And will result in a very long article. apparently Passing JSON parameters from the command line is difficult, simple, but can be a headache. Let’s look at that small part.
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We’ll assume you’ve installed and configured Nagios and all the services you want to monitor, created a SendGrid account, and created an Azure function that has HTTP triggers as input and SendGrid as output.
The monitoring tool provides a clear picture of how your applications and infrastructure are performing. with this information You can detect areas that need improvement. Targeting problem areas and fixing them before they occur not only improves performance but also saves your organization’s resources. especially time and money
There are many network monitoring tools and utilities out there. as well as commercial products and open source solutions. This makes it difficult to choose the perfect solution for your own infrastructure. Nagios can be integrated with other applications. It can perform tasks that are entrusted to external commands and third-party applications can easily send control commands and data to Nagios.
However, configuring Nagios and setting up the plugins requires time and specialized knowledge. Unless you’re experienced with Nagios Core, consider that the time spent configuring and debugging potential isn’t worth buying a commercial monitoring tool. only problem Not an essential resource for troubleshooting. although you should
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