I have experienced both having and being a mentor. Both roles require a lot of energy to get great results. But when the energy to support the collaboration is maintained by both the mentor and the mentee, magic can happen.

The union for engineers in Denmark IDA has a mentor program where members can be matched with a mentor. As part of the mentor program, I have been interviewed which resulted in the video below(in danish).

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Book Review: Designing Distributed Systems

When developing distributed systems with containers, common problems surface. Common problems in programming are tackled using patterns. Brendan Burns introduces several patterns to use when designing and implementing distributed systems. Similar to the thoughts behind using patterns for software development. The author is one of the co-founders of the Kubernetes projects, so he is an expert in distributed systems.

The book is only 149 pages long and is available for free from Microsoft. It features both generic explanations of the different patterns and hands-on examples on how to implement them using Kubernetes.

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Switching from GlusterFS to Amazon EFS

My current hosting set up uses GlusterFS to create a shared filesystem that all my docker hosts can use. The shared filesystem is used to host the upload folder in my WordPress installations.

The cool thing about GlusterFS is that it is a true cluster file share. It is installed on all nodes and makes all files available everywhere. So if any node crashes it does not affect the others.

But, this level of redundancy comes with a price. It is more difficult to maintain and it increases the needed storage space as the amount of nodes increase.

So I opted for the easy solution and switched to EFS.

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Book Review: Working Effectively with Legacy Code

This book is from 2005 and with 420 pages it is a “normal” sized tech book. The purpose of the book is to describe how we can add features, fix bugs and refactor in legacy code bases with as much confidence as possible. The primary takeaway is to add tests to aid us when making changes.

The book does show some age in a few places where there have emerged tools to support us. But all in all the book contains good pointers on how to approach legacy code. Much of the advice borders to common sense, but I still think it is a good idea to have the concepts in mind because it is easy to forget and just edit and pray.

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Improving scalability in C# using Async and Await

Learn how to improve performance using scalability with the async and await keywords. When are asynchronous code able to help us and when will it make our performance worse.

We want good performance in our software, and we can get good performance in two ways. 1. Refactor the software to do its tasks faster. 2. We can improve the software scalability so we can handle more concurrent tasks.

Asynchronous code targets scalability making us use the resources of our servers better.

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Book Review: Domain Driven Design

510 pages, published in 2004. The book is quite old for a tech-book but it has aged exceptionally well. It only shows age in a few unimportant areas in my opinion.

The concepts presented in the book have revolutionized me as a developer! Read it multiple times and with great attention to internalize all the knowledge it contains, it will be worth it. To really understand the concepts and integrate them you should also build a project as you read the book where you implement the examples.

I cannot recommend this book enough! Below is my notes from reading the book, it is partly a summary of each chapter and partly my own thoughts about the content.

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DockerCon EU 18 – Monitoring Docker Containers in Swarm mode

At DockerCon EU 18 I held a tech talk about monitoring Docker containers in swarm mode. Since the talk was only 20 minutes, it was not possible to cover all the interesting detail. This article provides some additional information and a tutorial for setting up a simple monitoring infrastructure for swarm mode. You can jump directly to the tutorial here.

The slides from the talk are available here.

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Book Review: Clean Architecture

This book is a must read for any serious software developer. It gives a high-level overview of software development that is missing from other more code-oriented books. The primary focus is on Object-Oriented Programming and how we build systems that are maintainable, flexible, extendable and correct. But the approach is high-level so not many code examples.

At 321 pages and 34 chapters, it is not the most extensive book, and it is an easy read because so much of the advice makes perfect sense. But it still has so much depth that I think it can be read multiple times to get all the nuggets of wisdom.

A different view on the book is from Blaine Osepchuk. The only criticism I have of the book is that some of the chapters feel more like intros and does not cover the theme adequately.

I have collected my notes from the book here for all to benefit. But the notes do not give the book the needed credit so please take the time to read it.

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OAuth and OpenID Connect for dummies

To learn more about how and why OAuth 2 works the way it does, I took part in a workshop hosted by as part of the Nordic APIS summit 2018. The workshop covered the basics of OAuth 2 and OpenID Connect. I have worked a little bit with OAuth 2  before so I knew the basics, but the workshop helped me gain a better understanding of the protocol and the different parts of it.

I have tried to describe the learnings I had from the workshop here both for my reference and it might help others understand OAuth 2 better.

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Scalable baseline website setup with authentification and VueJS, Amazon S3 and .net core 2.1

For my projects, I need a generic website setup that I can reuse for multiple projects.

I want to try out the following setup. A frontend build in Vue served as static files from Amazon S3. A backend built with .net core 2.1 as a REST API presented with Swagger. Finally, using Googles firebase authentification for login requirements.

Since I need a baseline platform for multiple projects, it needs to be generic enough to allow me to reuse the setup. Most of my projects need a similar setup with a frontend exposed to anonymous users and a backend dashboard which requires authentification.

In this article, I am going to cover how I set up the Vue frontend. In later articles, I will cover the authentification and the backend.

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