Tutorials

Status: Deprecated> Status: Deprecated # This article covers a version of CentOS that is no longer supported. If you are currently operating a server running CentOS 6, we highly recommend upgrading or migrating to a supported version of CentOS.

Introduction> Introduction # The vim text editor is a versatile and extremely powerful tool for manipulating plain text, managing system configuration files, and creating code. While the modal editing design focus and the elegant grammar of the editor itself is loved by its users, its interface and functionality sometimes lacks the niceties that some users would like.

Introduction> Introduction # Firewalld is a firewall management solution available for many Linux distributions which acts as a frontend for the iptables packet filtering system provided by the Linux kernel. In this guide, we will cover how to set up a firewall for your server and show you the basics of managing the firewall with the firewall-cmd administrative tool (if you’d rather use iptables with CentOS, follow this guide).

Introduction> Introduction # An indispensable tool in modern software development is some kind of version control system. Version control systems allow you to keep track of your software at the source level.

A previous version of this tutorial was written by Justin Ellingwood Introduction> Introduction # Want to access the Internet safely and securely from your smartphone or laptop when connected to an untrusted network such as the WiFi of a hotel or coffee shop?

Introduction> Introduction # Albeit one of the more controversial techniques, a good method to geographically distribute your application by taking advantage of your provider’s global presence is to use and manage DNS responses (i.

Introduction> Introduction # Networking is an expansive and overwhelming topic for many budding system administrators. There are various layers, protocols, and interfaces, and many tools and utilities that must be mastered to understand them.

Introduction> Introduction # The mod_evasive Apache module, formerly known as mod_dosevasive, helps protect against DoS, DDoS (Distributed Denial of Service), and brute force attacks on the Apache web server. It can provide evasive action during attacks and report abuses via email and syslog facilities.

The author selected the Electronic Frontier Foundation to receive a donation as part of the Write for DOnations program. Introduction> Introduction # Apache and Nginx are two popular open-source web servers often used with PHP.

Introduction> Introduction # The Python programming language comes with a variety of built-in functions. Among these are several common functions, including: print() which prints expressions out abs() which returns the absolute value of a number

Introduction> Introduction # Perhaps it was the article on Python Web Server Comparison tempting you to switch, or the the fact that you have simply outgrown your current application deployment stack.

Introduction> Introduction # Setting your server’s clock and timezone properly is essential in ensuring the healthy operation of distributed systems and maintaining accurate log timestamps. This tutorial will show you how to configure NTP time synchronization and set the timezone on an Ubuntu 14.

Introduction> Introduction # DNS, or the Domain Name System, is an integral part of how systems connect with each other to communicate on the internet. Without DNS, computers, and the people who use them, would be required to connect using only numerical addresses known as IP addresses.

Introduction> Introduction # An important part of managing server configuration and infrastructure includes maintaining an easy way to look up network interfaces and IP addresses by name, by setting up a proper Domain Name System (DNS).

Introduction> Introduction # The filter() Array method creates a new array with elements that fall under a given criteria from an existing array. In this article, you will learn about the filter() Array method.

Introduction> Introduction # Color gradients take a starting color and position and ending color and position. Then it performs a transition between the colors. With consideration for color theory, they can make an application more visually interesting than a plain design.

Status: Deprecated> Status: Deprecated # This article covers a version of CentOS that is no longer supported. If you are currently operating a server running CentOS 6, we highly recommend upgrading or migrating to a supported version of CentOS.

What is FTP?> What is FTP? # FTP is a way to transfer files between hosts over the internet. It is especially helpful as a way to upload or download files to or from a site quickly.

Introduction> Introduction # TLS, or transport layer security, and its predecessor SSL, which stands for secure sockets layer, are web protocols used to wrap normal traffic in a protected, encrypted wrapper.

Introduction> Introduction # Computer programs are great to use for automating and repeating tasks so that we don’t have to. One way to repeat similar tasks is through using loops. We’ll be covering Python’s while loop in this tutorial.