Tutorials

Introduction> Introduction # When you have your web site or application up and running behind a domain, it is often desirable to also allow your users access to it via the plain domain name and the www subdomain.

Introduction> Introduction # A tuple is a data structure that is an immutable, or unchangeable, ordered sequence of elements. Because tuples are immutable, their values cannot be modified. The following is an example tuple that consists of four elements:

Introduction> Introduction # Node-RED is a switchboard for the Internet of Things, a visual tool that helps you connect your favorite apps, websites, and hardware together to do new and useful things.

Introduction> Introduction # Version control systems are increasingly indispensable in modern software development as versioning allows you to keep track of your software at the source level. You can track changes, revert to previous stages, and branch to create alternate versions of files and directories.

Introduction> Introduction # The single responsibility principle is the idea that pieces of your application should have one purpose. Following this principle makes your Angular app easier to test and develop.

Introduction> Introduction # Docker makes it easy to wrap your applications and services in containers so you can run them anywhere. As you work with Docker, however, it’s also easy to accumulate an excessive number of unused images, containers, and data volumes that clutter the output and consume disk space.

Introduction> Introduction # Docker Swarm is the Docker-native solution for deploying a cluster of Docker hosts. You can use it to quickly deploy a cluster of Docker hosts running either on your local machine or on supported cloud platforms.

The author selected the COVID-19 Relief Fund to receive a donation as part of the Write for DOnations program. Introduction> Introduction # A little-known feature of Gmail and Google Apps email is Google’s portable SMTP server.

Introduction> Introduction # In recent years, Linux distributions have increasingly transitioned from other init systems to systemd. The systemd suite of tools provides a fast and flexible init model for managing an entire machine from boot onwards.

Introduction> Introduction # Iptables is a software firewall for Linux distributions. This cheat sheet-style guide provides a quick reference to iptables commands that will create firewall rules that are useful in common, everyday scenarios.

Introduction> Introduction # This article will walk you through setting up a server with Python 3, MySQL, and Apache2, sans the help of a framework. By the end of this tutorial, you will be fully capable of launching a barebones system into production.

Introduction> Introduction # Once your application is up and running in a cloud server environment, you may be wondering how you can improve your server environment to make the leap from “it works” to a full-fledged production environment.

Introduction> Introduction # A carefully tailored SPF record will reduce the likelihood of your domain name getting fraudulently spoofed and keep your messages from getting flagged as spam before they reach your recipients.

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

Introduction> Introduction # React Navigation is a popular library for routing and navigation in a React Native application. This library helps solve the problem of navigating between multiple screens and sharing data between them.

Introduction> Introduction # The “Hello, World!” program is a classic and time-honored tradition in computer programming. Serving as a simple and complete first program for beginners, as well as a good program to test systems and programming environments, “Hello, World!

Introduction> Introduction # A “LAMP” stack is a group of open source software that is typically installed together in order to enable a server to host dynamic websites and web apps written in PHP.

Introduction> Introduction # While many users need the functionality of a database management system like MySQL, its command-line interface may be less intuitive and user friendly for some, presenting a barrier to entry.

Introduction> Introduction # Arrays let you represent lists of data in your programs. Once you have data in an array, you can sort it, remove duplicates, reverse its order, extract sections of the array, or search through arrays for specific data.

Introduction> Introduction # Python is a versatile programming language that can be used for many different programming projects. First published in 1991 with a name inspired by the British comedy group Monty Python, the development team wanted to make Python a language that was fun to use.