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Nagios is one of the most popular open source monitoring systems. Nagios keeps an inventory of your entire IT infrastructure and ensures your networks, servers, applications, services, and processes are up and running. In case of failure or suboptimal performance Nagios will send notification alerts via various methods.

Redmine is one of the most popular open source project management and issue tracking software tools. It is cross-platform and cross-database and built on top of the Ruby on Rails framework. Redmine includes support for multiple projects, wikis, issue tracking system, forums, calendars, email notifications, and much more.

Redis is an open-source in-memory key-value data store. It can be used as a database, cache and message broker and supports various data structures such as Strings, Hashes, Lists, Sets, etc. Redis provides high availability via Redis Sentinel including monitoring, notifications Automatic failover. It also provides automatic partitioning across multiple Redis nodes with Redis Cluster.

In Linux, all files are associated with an owner and a group. The chown command is used to change the user and group ownership of a given file, directory or link.

TeamViewer is a cross-platform solution that can be used for remote control, desktop sharing and file transfer between computers. TeamViewer is proprietary computer software and it is not included in the Ubuntu repositories. This tutorial explains how to install TeamViewer on Ubuntu 18.04.

Apache Tomcat is an open source application server which supports Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies. It is one of the most widely used application and web server in the world today. This tutorial will show you how to install Apache Tomcat 9.0 on Debian 9 and configure the Tomcat web management interface.

Gradle is an open source build automation system used primarily for Java projects. It combines the best features of Ant and Maven. Unlike its predecessors which use XML for scripting, Gradle uses Groovy, a dynamic, object-oriented programming language for the Java platform to define the project and build scripts.

Django is the most popular Python web framework designed to help developers build secure, scalable and maintainable web applications. Django can be installed system-wide or in a Python virtual environment using pip. Django packages are included in the official Debian repositories and can be installed using the apt package manager. This is the easiest method to install Django on Debian 9, but not as flexible as installing in a virtual environment. Also, the version included in the repositories is always several releases behind the latest version of Django.

Zabbix is one of the most popular open source monitoring software tools. Zabbix collects metrics from your networks devices, systems and applications and ensures they are up and running. In case of any issues Zabbix will send notification alerts via various methods.

Zabbix can be deployed for agent-based and agent-less monitoring. The Zabbix agent has a small footprint and can run on various platforms, including Linux, UNIX, macOS and Windows.

Swap is a space on a disk that is used when the amount of physical RAM memory is full. When a Linux system runs out of RAM, inactive pages are moved from the RAM to the swap space. This tutorial covers the steps necessary to add a swap file on Ubuntu 18.04 systems.

WordPress is the most popular open source blogging and CMS platform worldwide, powering a quarter of all websites on the internet today. It is based on PHP and MySQL and packs a ton of features that can be extended with free and premium plugins and themes. WordPress is the simplest way to create your online store, website, or blog.

FFmpeg is a free and open source command line tool for transcoding multimedia files. It contains a set of shared audio and video libraries such as libavcodec, libavformat, and libavutil. With FFmpeg you can convert between various video and audio formats, set sample rates and resize videos.

Loops are one of the fundamental concepts of programming languages. Loops are handy, if you want to run series of commands over and over again, until a condition situation is reached. In scripting languages such as Bash, loops are useful for automating repetitive tasks. There are 3 basic loop constructs in Bash scripting, for loop, while loop, and until loop.

Redis is an open-source in-memory data structure store. It can be used as a database, cache and message broker and supports various data structures such as Strings, Hashes, Lists, Sets etc. This tutorial explains how to install and configure Redis on an CentOS 7 server.

Webmin is an open source web control panel for system administration for Linux/UNIX. Webmin allows you to manage users, groups, disk quotas as well as configure most popular services including web, FTP, email and database servers.

FTP (File Transfer Protocol) is a standard client-server network protocol that allows users ro transfer files to and from a remote network. There are several open source FTP servers available for Linux. The most popular and widely used are PureFTPd, ProFTPD and vsftpd. In this tutorial we’ll be installing vsftpd (Very Secure Ftp Daemon).

phpMyAdmin is a free, open source PHP based application designed to simplify the administration of MySQL and MariaDB servers over a web-based interface. phpMyAdmin allows you to manage MySQL databases, user accounts and privileges, execute SQL-statements, import and export data in a wide variety of data formats and much more.

This series of tutorials will take you through how to install a LAMP stack on Debian 9. We will show you how to install Apache, create Apache virtual hosts, generate a free Let’s Encrypt SSL certificate, install and secure MySQL and install PHP 7.2.

Docker Compose is a tool that allows you to define and orchestrate multi-container Docker applications. It uses a YAML file to configure the application's containers, networks and volumes. Compose can be used for various purposes. Single host application deployments, automated testing and local development are the most popular use cases for Docker Compose.

Flask is a free and open source micro web framework for Python designed to help developers build secure, scalable and maintainable web applications. Flask is based on Werkzeug and uses Jinja2 as template engine.