Linux

iptables tutorial – rule sets for creating data packets

Since the first version, Linux kernel has been implementing packet filter modules, with which filter tables can be created. However, additional programs such as iptables are required to configure the rule set. In our tutorial, we present the free software for the Linux kernel 2.4 and 2.6 and give you a little insight into how it all works.   

Linux editor: effective code editing with Vim

In order to edit text files or receive source codes from software or websites, you require a text editor. Whether you’re using Linux, Windows, or Mac: the majority of operating systems these days already have them installed by default. There are also editors like Vim, which have a wider range of functions and simplify working with the confusing lines of code.   

htop – the task manager for Linux, Mac OS X and BSD

Process managers can give experienced computer users and administrators an accurate overview of which programs and services are taking up the system’s capacity. Classic command-line tools are confusing, and can only be controlled with complicated commands. For Unix-like systems, such as Ubuntu, the task manager htop, with its text interface, is a first-class alternative. It can help inexperienced [...]   

XAMPP tutorial: create your own local test server

The software packet XAMPP is a collection of popular applications like the web server Apache, a leading database management system (either MySQL or MariaDB), the scripting languages PHP and Perl, and more – all together in a compact test server. Our XAMPP tutorial will take you through the installation and configuration process, with the aid of clear instructions and screenshots, to help you set [...]   

DNS server not responding – what’s next?

‘DNS server not responding’ is a typical error response on Windows. Its presence indicates that some sort of problem is occurring with your internet connection. This phenomenon can be the result of many different causes. In addition to network problems, routers, Windows Firewall, and the web browser are also taken into account when troubleshooting.   

Setting up server backups with rsync

A server backup is the best method for securing the data of your online projects, thereby preventing any damaging losses. Server environments are especially in need of cleverly devised backup strategies that take every type of device into account. Here, backup programs become essential. Free applications, like rsync, offer reliable and compelling alternatives to their expensive conventional [...]   

LAMP servers – the solution for dynamic websites

If independently installing the software package for your hosting project is your goal, then you might consider choosing one of the many free components out there. Sooner or later you are bound to encounter the widely used and very popular LAMP stack software bundle. But what exactly makes this package so attractive in comparison to alternative options?   

Allocating directory rights with chmod

With Linux, access rights for directories and files are often set through the terminal. There, file owners can be defined and groups can be assigned. With the command, chmod, user classes can be assigned certain file rights. Access rights in the Unix file system can be changed in two different ways: symbolic or numeric. Find out more about both notation types here.   

Introduction to netstat

Various computer networks are connected with one another via the internet. In order to build up such connections, both the sending as well as the receiving systems have to provide transfer interfaces, or ports. The command line program netstat allows you to find out which ports are opened by your own system and which active connections exist — all of this helps reduce the risk of undesired access [...]