Dan Wahlin


5 Actions You Can Take To Reduce Anxiety/Stress and Increase Overall Wellbeing

Have you struggled much with anxiety or worry in your life? They can be easy to avoid when things are going good, but how do you handle them in more stressful situations? What can you do to help minimize anxiety, worry, and stress in your job, family, and other areas of life? As someone who has struggled with anxiety and worry from time to time over the years I asked myself the same question and decided that I needed to take action. This post details a few strategies and actions that have really helped me in a big, big way. […]


New Pluralsight Course – Kubernetes for Developers: Deploying Your Code

I’m excited to announce the release of my next course on Pluralsight titled Kubernetes for Developers: Deploying Your Code! This course is the next in the Kubernetes for Developers learning path and focuses on different techniques that can be used to deploy your containerized applications to Kubernetes. It follows the Kubernetes for Developers: Core Concepts course. Here’s the recommended order for taking my courses that cover containers and Kubernetes: Docker for Web Developers Kubernetes for Developers: Core Concepts Kubernetes for Developers: Deploying Your Code Here are a few questions this course will help you answer: What is a Kubernetes Deployment […]


Using the Kubernetes JavaScript Client Library

I’ve been working with Kubernetes a lot and focusing on various deployment techniques that can be used (such as Blue-Green Deployments) for a Pluralsight course I’m creating called Kubernetes for Developers: Deploying Your Code. If you’re new to Blue-Green Deployments, here’s a quick overview: While I was working on the course, Dr. Christian Geuer-Pollmann and I had chatted on Twitter about a Blue-Green dashboard he wrote. He did a great job on it! I’ve been wanting to experiment with the JavaScript Kubernetes Client library so I decided to see what could be done to create a simple Blue-Green Deployment “dashboard” […]


Enabling Metrics Server for Kubernetes on Docker Desktop

Lately we’ve been working on a new Docker and Kubernetes instructor-led training class that we’ll be running onsite at several companies this year. The class uses Docker Desktop and the Kubernetes features it provides for several of the chapters. We needed to get the local cluster students will use to match as closely as possible to a cloud-based Kubernetes cluster that would be found on Azure, AWS, or GCP. The class covers using AKS as well, but most of the lab exercises rely on Kubernetes in Docker Desktop so running key features like the dashboard and Metrics API was important. […]


New Pluralsight Course: Creating Object-oriented TypeScript Code

I’m excited to announce the release of another course on Pluralsight titled Creating Object-oriented TypeScript Code! If you’ve been wanting to learn more about ES2015 features as well as object-oriented features available in TypeScript then this this is the class for you! Here are a few questions this course will help you answer: What techniques can be used to create objects in JavaScript and TypeScript? What is object-oriented programming? Can I work with classes? What are constructors? What are get/set properties? How do I define functions in classes? Is a static member the same as an instance member? Can classes […]


Observable Store – Now with Support for the Redux DevTools

Observable Store now supports extensions! These can be added when the application first loads by calling ObservableStore.addExtension(). The first built-in extension adds Redux DevTools integration into applications that use Observable Store. The extension can be found in the @codewithdan/observable-store-extensions package. If you’re new to the Redux DevTools, they can be used to “time travel” through your application to see what happened at particular times. This feature is extremely useful when you’re trying to track down a problem or simply want to see what state flows through your application. You can get more details on the various Redux DevTools extension features […]


Using the Docker "before" Filter to Remove Multiple Images

I recently needed to cleanup a bunch of old Docker images on a VM that I run in Azure. While I could remove each image one by one using the standard docker rmi [IMAGE IDS] command, removing multiple images all at once as a batch was preferable. It turns out that removing a specific range of images is fairly straightforward using the “before” filter. You can do the following to list all images that exist before a particular image: Running the command will show all of the images that existed before the danwahlin/nginx-codelabs:1.15 image (basically the older images). Once you […]


Installing MongoDB on Mac Catalina using Homebrew

I recently bought a new iMac and moved all of my files over using Time Machine. The migration went really well overall and within a few hours I had my development machine up and running. After starting an application I’m building I quickly realized that I couldn’t get MongoDB to start. Running the following command resulted in an error about the data/db directory being read-only: I tried every chmod and chown command known to man and woman kind, tried manually changing security in Finder, compared security to my other iMac (they were the same), and tried a bunch of other […]


Observable Store 2.0 Released on npm!

I’m excited to announce the release of Observable Store 2.0 on npm! You can get started using it with the standard npm install command: The Github repository provides information about the specific steps to get started and how Observable Store can be used with various front-end projects. Why Observable Store? Before jumping in to what’s new in 2.0, let me give a quick overview of the Observable Store project in case you’re new to it. Several years ago I was working with a few large companies here in the United States who were building Angular and React apps. One in […]


New Pluralsight Course – Kubernetes for Developers: Core Concepts

I’m excited to announce the release of my next course on Pluralsight titled Kubernetes for Developers: Core Concepts! Since creating the Docker for Web Developers course I’ve been wanting to create a course that takes developers to the “next level” with containers and the new Kubernetes for Developers course does that! Here are a few questions this course will help you answer: Why should I learn about Kubernetes if I’m a developer? What are the core concepts that I should know about to get started? How can I get Kubernetes running on my development machine? What is the role of […]