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Nagios Core Installation and Configuration on Ubuntu Server

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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Add ssl to Mysql and Postgresql

Adding ssl support to a relational database like mysql or postgresql is a standard task. First we need to have our certificates ready. We can either use mysql workbench which has a nice wizard. Or we can create them using openssl. In the end we will end up with three files ssl-ca=ca.pem ssl-cert=server-cert.pem ssl-key=server-key.pem We can also check that everything is ok ...

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Replacing Text in Nginx with sub_filter

Sometimes you find yourself in a weird predicament. A third party application that you’ve slapped nginx in front of insists on using internal IP addresses or ports despite your reverse proxy passing all the correct headers and other pieces required. Or maybe you’ve found yourself in the situation I found myself in last week where you have a third party ...

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VirtualBox Tutorial: Virtualization Essentials

Course Overview In this post, we feature a comprehensive VirtualBox Tutorial. Oracle VM VirtualBox is a free and open-source hypervisor for x86 computers from Oracle Corporation. VirtualBox may be installed on a number of host operating systems, including: Linux, OS X, Windows, Solaris, and OpenSolaris. There are also ports to FreeBSD and Genode. It supports the creation and management of ...

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Managing VirtualBox Virtual Machines through Command Line (with VBoxManage)

This article is part of our Academy Course titled VirtualBox Tutorial: Virtualization Essentials. In this course, we provide a compilation of VirtualBox tutorials that will help you get started with this virtualization platform. We cover a wide range of topics, from installing the software and performing a basic configuration, to cloning, exporting, importing, and removing virtual machines. With our straightforward ...

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Arduino as a wireless HTTP client

There are many aspects one must take into consideration when it comes to picking the right board for their project – from performance, memory, battery life, available slots for SD cards or bee modules all the way to the connectivity, namely network interface. Whether it is wired or wireless network interface, it plays crucial role in the way the board ...

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Systemd and Upstart Services

Most linux servers that I use are either Debian based or RedHat based. A common task is adding daemon services. Suppose that we want to start a tomcat application on startup First we shall install tomcat mkdir /opt/tomcat groupadd tomcat useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat wget http://apache.cc.uoc.gr/tomcat/tomcat-8/v8.0.33/bin/apache-tomcat-8.0.33.tar.gz tar xvf apache-tomcat-8.0.33.tar.gz mv apache-tomcat-8.0.33/* /opt/tomcat rm -r apache-tomcat-8.0.33 apache-tomcat-8.0.33.tar.gz cd ...

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How to configure the settings of a Virtual Machine in VirtualBox

This article is part of our Academy Course titled VirtualBox Tutorial: Virtualization Essentials. In this course, we provide a compilation of VirtualBox tutorials that will help you get started with this virtualization platform. We cover a wide range of topics, from installing the software and performing a basic configuration, to cloning, exporting, importing, and removing virtual machines. With our straightforward ...

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