Tutorials

Introduction> Introduction # R is a popular open source programming language that specializes in statistical computing and graphics. It is widely used for developing statistical software and performing data analysis. R is easily extensible, and the community is known for continuously adding user-generated packages for specific areas of study, which makes it applicable to many fields.

What is PostgreSQL?> What is PostgreSQL? # PostgreSQL is a modern database management system. It is frequently used to store and manipulate information related to websites and applications. As with any kind of valuable data, it is important to implement a backup scheme to protect against data loss.

Status: Deprecated> Status: Deprecated # This article is deprecated and no longer maintained. Reason> Reason # Ubuntu 12.04 reached end of life (EOL) on April 28, 2017 and no longer receives security patches or updates.

Introduction> Introduction # This tutorial shows how to deploy Nginx in a Docker container. By containerizing Nginx, we cut down on our sysadmin overhead. We will no longer need to manage Nginx through a package manager or build it from source.

Introduction> Introduction # Docker Compose makes dealing with the orchestration processes of Docker containers (such as starting up, shutting down, and setting up intra-container linking and volumes) really easy. This article provides a real-world example of using Docker Compose to install an application, in this case WordPress with PHPMyAdmin as an extra.

Introduction> Introduction # GitLab CE, or Community Edition, is an open source application primarily used to host Git repositories, with additional development-related features like issue tracking. It is designed to be hosted using your own infrastructure, and provides flexibility in deploying as an internal repository store for your development team, publicly as a way to interface with users, or even open as a way for contributors to host their own projects.

Postfix Introduction This tutorial will tell you how to setup a basic mail server and teach you a bit about the Postfix MTA (Mail Transfer Agent) in the process. Postfix is extremely flexible.

Prelude> Prelude # HAProxy is an open source software which can load balance HTTP and TCP servers. In the previous article on HAProxy we configured load balancing for HTTP and in this one we’ll do the same for MySQL.

Introduction> Introduction # Let’s Encrypt is a Certificate Authority (CA) that provides an easy way to obtain and install free TLS/SSL certificates, thereby enabling encrypted HTTPS on web servers. It simplifies the process by providing a software client, Certbot, that attempts to automate most (if not all) of the required steps.

Introduction> Introduction # Python modules are .py files that consist of Python code. Any Python file can be referenced as a module. Some modules are available through the Python Standard Library and are therefore installed with your Python installation.

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.

In this article, you will learn about the CSS line-height property and how you can use it to create visually pleasant, readable text. You have probably seen line-height being used before:

Introduction> Introduction # Postfix is an MTA (Mail Transfer Agent), an application used to send and receive email. In this tutorial, we will install and configure Postfix so that it can be used to send emails by local applications only – that is, those installed on the same server that Postfix is installed on.

Status: Deprecated> Status: Deprecated # This article covers a version of Ubuntu that is no longer supported. If you are currently operate a server running Ubuntu 12.04, we highly recommend upgrading or migrating to a supported version of Ubuntu:

Introduction> Introduction # The Apache HTTP server is the most widely-used web server in the world. It provides many powerful features including dynamically loadable modules, robust media support, and extensive integration with other popular software.

About Apache Tomcat> About Apache Tomcat # Apache Tomcat is a web server and servlet container that is used to serve Java applications. Tomcat is an open source implementation of the Java Servlet and JavaServer Pages technologies, released by the Apache Software Foundation.

Introduction> Introduction # High availability is a function of system design that allows an application to automatically restart or reroute work to another capable system in the event of a failure.

Introduction> Introduction # Node.js is an open source Javascript runtime environment for easily building server-side and networking applications. The platform runs on Linux, OS X, FreeBSD, and Windows, and its applications are written in JavaScript.

Introduction> Introduction # High availability is a function of system design that allows an application to automatically restart or reroute work to another capable system in the event of a failure.

Introduction> Introduction # @font-face is a CSS at-rule used to define custom fonts. With @font-face, you provide a path to a font file hosted on the same server as your CSS file.