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In this article, you will learn how to install kannel server on Debian and integrate it to a Nagios server for sms notifications. We asume that the reader already has a working Nagios server and we will focus on Kannel installation and its integration with Nagios.

As a Linux system administrator, you will sometimes have to add new user account to your system. To do so, adduser command is often used. When it comes to multiple users' creation, adduser command may become boring and time-consuming. This short article intends to provide the Linux system administrator with a simple and unattended way for bulk user creation. The newusers command will help you to create multiple users by getting their info from a prefilled file.

Etherpad is an Open Source, web-based and real-time collaborative editor. It allows multiple persons, using their web browsers to edit a document at the same time. It also offers some cool features like rich text formating and instant messaging.

Whether you want to be able to connect remotely to your corporate network or to construct a virtual network between two remote points, through an unsecure network (eg: Internet), you will somehow need a VPN (Virtual Private Network). A VPN allows you to securely connect to a remote LAN (Local Area Network) through Internet or untrusted networks.

Netflix and Linux have a somewhat troubled past. For years, Netflix actively blocked Linux users. More recently, support for Google Chrome was added. Firefox users, however, have been out of luck until just recently. As of Firefox 49, the option of using Google's DRM from the Chrome browser to play DRM content has been made optionally available to Firefox users. This has made it possible to watch Netflix, and potentially other DRM streaming services, using Firefox and without installing Google Chrome. What's better, the DRM can be turned off when you're done watching.

Python is a big deal. It is one of the fastest growing and most in-demand programming languages in the world today. Python is so flexible and versatile that it is used for nearly every job that a programming language can do. Python powers desktop applications, is used for Linux system scripting and automation, acts as a glue language between Linux applications, is a supplemental scripting language in large programs like GIMP, Blender, and Autodesk Maya, performs crucial scientific and mathematical calculations, and runs some of the web's largest sites like Quora, Reddit, and Dropbox.

Eclipse is a powerful and feature-rich IDE for Java developers, but the versions packaged with Debian and Ubuntu lag far behind the latest releases. In fact, the version shipping with Ubuntu 16.04 was released in 2012 and was discontinued quite some time ago. Despite the fact that both Ubuntu and Debian don't package and ship new versions of it anymore, Eclipse is still easily available to users of both distributions. You just have to go about getting it a different way, and the Eclipse developers have a great solution for this.

Two of the most popular and highest quality media programs available for Linux are not available through Fedora's default repositories. Of course, these are no other than Kodi and VLC, and they are available on Fedora through RPM Fusion. Kodi, which was previously known as XBMC, has boomed in popularity as of late with both Linux and mainstream audiences.

Steam is easily the most popular PC gaming client, and with hundreds of titles available for Linux, it's not wonder why Linux gamers would want to install and use it. This is easier on some distributions than others, especially considering that Valve, the company behind Steam, officially targets Ubuntu and Debian. Fedora users won't find Steam anywhere in the official Fedora repositories. This is mostly because of Fedora's strict free software policies. It is available through a reliable third-party repository, though, and it runs great when you get it set up.

The latest AMDGPU drivers launched from AMD only a few short days ago bringing changes like FreeSync support and additional support for mobile chipsets as well as the obvious performance improvements. Like the previous versions of the proprietary AMDGPU driver, only "Enterprise Grade" distributions are supported, so you won't find official Ubuntu 16.10 support just yet. Ubuntu 16.04 is continuing to be supported, and that will be the target of this guide.

There are multiple ways on how to install Node.js on your Ubuntu 16.04 Xenial Xerus Linux server. The below steps will show you how to install Node.js using a standard Ubuntu repository, PPA repository, Node.js native setup script and by use of Node Version Manager. The easiest installation is by using standard Ubuntu repository, however it yields lower Node.js version. If you need a bleeding-edge Node.js version you better opt for an automatic installation using the Node.js native setup script.

Unbound is a validating, recursive, and caching DNS server. Having said that, Unbound DNS server cannot be used as an authoritative DNS server, which means it cannot be used to host custom domain name records. As a result, if your goal is to build a cache-only or forwarding DNS server, Unbound may be your preferred choice, as it does just that and it does it well.

Here's another trip back to math class. If you remember, functions took in a number, did something to it, then outputted the new value. They were often represented in tables with the input on one side and the output on the other. Functions in programming are similar. Sometimes they take input. Sometimes they don't. Much of the time they return a value as well, but they don't always have to. In every case, they are used to repeat an operation whenever they are used, and that's the greatest similarity with the math concept.

You've already gotten acquainted with dictionaries, but just like the other data structures Python supports, there are methods and more powerful ways to use them. There aren't as many methods for working with dictionaries as there are for lists, but that's because dictionaries just don't need them. Plus, many of the ones that do exist, work to break down dictionaries into lists and tuples to make them easier to manage. So, those list methods can be used in conjunction with the dictionary ones to create an efficient machine for handling data.

Somebody hit lists with gamma rays. Okay, so Dictionaries aren't the Incredible Hulk, but they are supercharged in what they can do. In other languages, dictionaries are referred to as hashes, associative arrays, and associative lists. It's probably best to think of them as associative lists because that's exactly what they are. Dictionaries are lists that associate two values with one another. To think of it in terms of an actual dictionary, they associate a word, or key with a definition, or value. They function sort of like a list with custom indexes.

How can a program make a decision? Can a program choose between two or more options. Actually, it can. This isn't some kind of advanced AI concept, it's just a matter of evaluating whether or not certain conditions have been met and choosing a response.

If you've been following along, you're probably tired of hearing about lists right about now. Well, this guide has nothing to do with lists! Remember back when you first leaned about variables; how there was one that just held True or False called a Boolean? There hasn't been a guide on them because Booleans are actually that simple. However, there are symbols called Boolean Operators that are used to evaluate whether a statement is true or false.

Tuples are immutable data sets made up of data of different types. While tuples are very similar to lists, they are different in those key ways. Tuples cannot be changed once they are created. The data they hold can be passed to a different tuple, but the original tuple cannot be changed. This means that tuples don't have methods for manipulating them like lists do because they cannot be manipulated.

Now it's time to take lists to a new dimension. No, you don't need to learn how to code in "The Upside Down," but there are additional degrees of complexity to lists. Lists are used to hold data, but they are also used to categorize it. Values inside a list can be further broken down into other sets. That's essentially what a multidimensional list is.

Using methods with lists gives you the power to manipulate the data stored in the lists quickly and effectively. Many of these methods are concerned with finding, adding, and removing pieces of data stored within the list they are being called on. Others are more concerned with the structure of the list itself.