What are good open-source log monitoring tools on Linux

In an operating system, logs are all about keeping track of events, be it critical system errors, resource usage warnings, transaction history, application status, or user activities. These logs, which are stored as (text or binary) files in the system, are useful for system auditing, debugging and maintenance. However, with so many different system entities […]
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How to monitor server memory usage with Nagios Remote Plugin Executor (NRPE)

In a previous tutorial, we have seen how we can set up Nagios Remote Plugin Executor (NRPE) in an existing Nagios setup. However, the scripts and plugins needed to monitor memory usage do not come with stock Nagios. In this tutorial, we will see how we can configure NRPE to monitor RAM usage of a […]
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How to set up Nagios Remote Plugin Executor (NRPE) in Linux

As far as network management is concerned, Nagios is one of the most powerful tools. Nagios can monitor the reachability of remote hosts, as well as the state of services running on them. However, what if we want to monitor something other than network services for a remote host? For example, we may want to […]
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How to monitor BGP sessions with Nagios

As a versatile network monitoring tool, Nagios can monitor the health of various network elements such as routers and switches. Among others, Nagios can be configured to monitor BGP sessions of a router, and generate alerts whenever there is something wrong in existing BGP sessions. Several BGP monitoring plugin tools exist for Nagios. These tools […]
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How to monitor common services with Nagios

Nagios comes with a wide range of built-in scripts for monitoring services. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. To keep the article focused on service monitoring, we will not be configuring hostgroups or templates, as they have […]
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How to configure Nagios for audio alerts and mobile notifications

In a Network Operation Centre (NOC) environment, setting up alerts is extremely important. As one of the most popular NOC monitoring systems, Nagios features powerful alerting services. Alerts generated by Nagios can be sent out in various means, so that they can be acted upon immediately. Email notification is the most commonly used option. This […]
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How to install and configure Nagios on Linux

Nagios is one of the most powerful network monitoring systems, which is widely used in the industry. It can actively monitor any network, and generate audio/email warnings and alerts when any problem is detected. The check types and alert timers are fully customizable. Another incredible capability of Nagios is that it can monitor both hosts […]
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