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Nagios Tutorial for IT Monitoring

Course Overview Nagios, now known as Nagios Core, is a free and open source computer-software application that monitors systems, networks and infrastructure. Nagios offers monitoring and alerting services for servers, switches, applications and services. It alerts users when things go wrong and alerts them a second time when the problem has been resolved. Nagios was originally designed to run under ...

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Unix: Split string using separator

I recently found myself needing to iterate over a bunch of ‘/’ separated strings on the command line and extract just the text after the last ‘/’. e.g. an example of one of the strings A/B/C I wanted to write some code that could split on ‘/’ and then pick the 3rd item in the resulting collection. One way of ...

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How To Scale SSL with HAProxy and Nginx

SSL is CPU Intensive If you haven’t already enabled SSL session caching, do that NOW. But what if you have many unique requests and your load balancer is maxing out it’s CPU? That was the case with WakaTime’s load balancer, because as you use the WakaTime plugins you are constantly making requests to our api saying you’re still working on ...

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Nagios alternatives: Centreon and Icinga

This article is part of our Academy Course titled Nagios Tutorial for IT Monitoring. In this course, we provide a compilation of Nagios tutorials that will help you set up your own monitoring infrastructure. We cover a wide range of topics, from installation and configuration, to plugins and NRPE. With our straightforward tutorials, you will be able to get your ...

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Elasticsearch Throttling Indexing

Recent adventures in Zapierland had me in a somewhat scary predicament. Starting at some point last week I’d get an alert that the Elasticsearch cluster we run Graylog against had hit very high CPU, load and memory usage. I was confused… we had more than enough horsepower to handle queries and normally the cluster only uses about 10% of CPU ...

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Linux IfConfig Tutorial

The network configuration is one of the first topics a system administrator gets involved with. For Linux, the command to configure this is ifconfig (contraction of interface and configuration), which allows to make almost any configuration in a network, as we will see in this tutorial. Basic knowledge about networking (what IP addresses are, their format, subnetting, etc.) is assumed ...

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Nagios monitoring through SNMP

This article is part of our Academy Course titled Nagios Tutorial for IT Monitoring. In this course, we provide a compilation of Nagios tutorials that will help you set up your own monitoring infrastructure. We cover a wide range of topics, from installation and configuration, to plugins and NRPE. With our straightforward tutorials, you will be able to get your ...

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Linux Find Command Tutorial

Linux find command is a powerful and flexible search tool that not only every system administrator must master, but also any kind of Linux user. This tutorial will show how to use it to perform almost any type search with this useful command. For this tutorial, Linux Mint 17.3 and find 4.4.2 have been used. 1. Find by file name The ...

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