The Dependency Inversion Principle: An Example with Flexible Payment Solutions using JavaScript

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Posted on January 18, 2025 Author Paul Leasure No Comments on Mastering the Dependency Inversion Principle: Flexible Payment Solutions with JavaScript Picture this: You run an online store, and every transaction runs through a single payment provider. Let’s say it’s PayPal. Now imagine what happens if PayPal increases its fees, goes down unexpectedly, or a… Read more The Dependency Inversion Principle: An Example with Flexible Payment Solutions using JavaScript

Using Multiple SSL Certificates on AWS Application Load Balancer for Different Domains

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If you’re hosting multiple websites with different domains on an AWS Application Load Balancer (ALB), you might wonder if it’s possible to use multiple SSL certificates on a single listener. The answer is yes, thanks to Server Name Indication (SNI). This guide, shows you how to associate multiple SSL certificates with your ALB listener to… Read more Using Multiple SSL Certificates on AWS Application Load Balancer for Different Domains

How to Validate an AWS ACM SSL Certificate When Your DNS is managed by Cloudflare

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Securing your website with an SSL certificate is a must, especially if you’re using AWS services. When requesting an SSL certificate from AWS ACM, you’ll need to validate your domain ownership. If your DNS is managed by Cloudflare, this guide will help you add the required CNAME records correctly. Step 1: Request an SSL Certificate… Read more How to Validate an AWS ACM SSL Certificate When Your DNS is managed by Cloudflare

Cloudflare: How to Configure Cloudflare DNS for an AWS Application Load Balancer

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If you’re using Cloudflare as your DNS provider and want to connect your subdomain www.example-web-app.com to an AWS Application Load Balancer (ALB), you can do so easily using a CNAME or A record. This guide will show you how to keep Cloudflare’s protection while integrating seamlessly with your AWS infrastructure. Why Use Cloudflare and AWS… Read more Cloudflare: How to Configure Cloudflare DNS for an AWS Application Load Balancer

Keeping Directory Owners organized by Using the Setgid Bit with Directories: When, Why, and How

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Managing permissions on directories is a critical part of maintaining a secure and organized file system. One powerful but often overlooked tool in this realm is the setgid (Set Group ID) bit. Understanding when, why, and how to use the setgid bit can simplify the management of shared directories and ensure that files inherit consistent… Read more Keeping Directory Owners organized by Using the Setgid Bit with Directories: When, Why, and How

How to Check User-Data Script Logs on an EC2 Instance

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When launching an EC2 instance, the user-data script can be a powerful tool for automating the setup and configuration of your server. However, troubleshooting issues with the user-data script can be challenging if you don’t know where to look. In this article, we’ll walk you through how to check the logs of your user-data script… Read more How to Check User-Data Script Logs on an EC2 Instance

The Benefits of Using Terraform and CloudFormation for AWS Infrastructure Management

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Managing cloud infrastructure can be a complex task, especially as your environment scales. Fortunately, there are powerful tools available to simplify this process: Terraform and AWS CloudFormation. Both are Infrastructure as Code (IaC) tools that allow you to define and provision infrastructure using code. In this blog post, we’ll explore the benefits of using Terraform… Read more The Benefits of Using Terraform and CloudFormation for AWS Infrastructure Management

Understanding the Boltzmann Constant

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Understanding the Boltzmann Constant What is the Boltzmann Constant? The Boltzmann constant () is a fundamental physical constant that plays a crucial role in statistical mechanics and thermodynamics. It links the microscopic properties of particles, such as energy and temperature, to macroscopic properties, like pressure and volume. Value: J/K (joules per kelvin) Symbol: or sometimes… Read more Understanding the Boltzmann Constant

Understanding the Factor 3 / 2 in a Boltzman Energy Equation

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Why is there 3 / 2 in a Boltzman Energy Equation? The factor in the equation arises from the kinetic theory of gases and is related to the degrees of freedom of a particle in three-dimensional space. Understanding the Factor 3 / 2 in a Boltzman Energy Equation Degrees of Freedom:In classical mechanics, the degrees… Read more Understanding the Factor 3 / 2 in a Boltzman Energy Equation

Getting an understanding of PLANCK’S LAW DERIVATION

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Let’s break down and understand the derivation of Planck’s Law step-by-step. Planck’s Law Derivation Planck’s Law in terms of frequency () is given by: where: is the spectral radiance. is Planck’s constant. is the frequency of the emitted radiation. is the speed of light. is the Boltzmann constant. is the absolute temperature. Understanding the Terms… Read more Getting an understanding of PLANCK’S LAW DERIVATION