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Event Sourcing and CQRS Explained (Are they worth the hassle?)

Software Architecture

Event Sourcing and CQRS Explained (Are they worth the hassle?)

Event Sourcing and CQRS are possibly the most fascinating architectural patterns in the software world, especially when combined with an event-driven architecture (EDA). In this article, we explain both patterns highlighting advantages and disadvantages of these approaches. In the conclusion, I will give you my personal opinion on whether these

GitOps Explained: Is it worth it?

GitOps Explained: Is it worth it?

If you’re thinking of adopting GitOps or want to know more about it, this is the right article for you. I’ll explain it and show its benefits, but most importantly I’ll cover the drawbacks which are not mentioned by other videos or blogs. I’ll stick to

Backend for Frontend Pattern Explained

Software Architecture

Backend for Frontend Pattern Explained

In this article, I cover the “Backend for Frontend” pattern mentioned by Sam Newman in his “Building Microservices” book. You can also find the same content in video format on my YouTube channel. Introduction There are times when the typical general-purpose API backed by a microservice is not enough to

The only Two Good Reasons for Microservices

Software Architecture

The only Two Good Reasons for Microservices

Stop making microservices the goal of your architecture. There’s nothing more complex to build and operate than a distributed system. That’s why we really need to have good reasons to adopt a “microservices architecture”. If you search the web for advantages of microservices, you’ll find this list.

Domain-Driven Design Explained: Anemic Models

Software Architecture

Domain-Driven Design Explained: Anemic Models

In this article, we explain the concept of anemic model which is extremely common in modern applications. We also try to identify why anemic models are so popular, as well as proposing solutions to mitigate this issue. What is an Anemic Model? A model is anemic when its objects have

Domain Driven Design (DDD) Explained

Software Architecture

Domain Driven Design (DDD) Explained

Domain Driven Design (DDD) is one of the pillars of object oriented software development. You must understand it really well if you want to produce future proof code and designs. Despite it looks intimidating to most developers, the concepts of DDD are really straight-forward and to some extent based on

REST APIs Explained

In this article, we will explain what are REST APIs, also known are RESTful APIs, and how we can design them and implement them quickly. What is an API? First we need to define what an API is. An API is a contract between a provider and a user that

Reduce the size of Docker images with few steps

One of the advantages of using Docker images is that they are portable. However, portability is directly related to the size. A mobile phone wouldn’t be really “mobile” if it weighed 10 Kg. The same applies to Docker images. We want our containers to be as slim as possible.

Immutable Kubernetes Pods

Immutable Kubernetes Pods are absolutely necessary if you are deploying your applications in a containerized environments and you want them to be secure. Despite this, most developers and teams do not use immutable pods. In this tutorial, I will explain in a simple manner what they are and why they

Install and Learn Kubernetes in 10 minutes

In this tutorial, I will show you how to install and learn the basics of Kubernetes in just 10 minutes. We will be using a super-lightweight certified distribution of Kubernetes: MicroK8s by Canonical. This distribution requires very little resources and can run on Linux, Windows and macOS. For the purpose

Install Maven on Ubuntu 22.04

In this tutorial, we install the latest version of Maven on Ubuntu 22.04. Unfortunately, the Ubuntu repository ships an old version of Maven which is not compatible with the recent versions of the Java Development Kit (JDK). We will proceed with the manual installation. Pre-requisites Before proceeding with the

Install Java Temurin JDKs instead of OpenJDK

The OpenJDK Docker image (openjdk) has been deprecated, thus you need to immediately migrate to another distribution if you wish to receive feature and security updates. The Eclipse Temurin are a set of Java JDKs offered by Adoptium. In this article, I show you how to install Temurin on different

Kubernetes CKAD CKA CKS Certification Exam Tips

Kubernetes is hands down the most disruptive technology that we have seen in the IT industry in recent years. It is loved by software developers, operators, and business owners. It is pure expression of what DevOps means from a technical perspective. Holding a Kubernetes certification is something I strongly advice

Configure microk8s NGINX Ingress

This is a very simple and short tutorial which helps you configure your NGINX Ingress on microk8s. A common use case is enabling the use-forwarded-headers flag so that NGINX passes incoming X-Forwarded-* headers to upstreams. Verify Addon Presence Let’s verify that the our ingress addon is enabled and running

Easy centralized logging on Kubernetes with Grafana Loki

Centralized Log Management is an essential solution for modern software development, especially when utilizing cloud native technologies. In Kubernetes, your application runs in pods which are relatively ephemeral i.e., disposable entities. Trailing the logs of pods is simply a nightmare and in general a very bad idea. A better

Expose TCP and UDP services with the Kubernetes Nginx Ingress Controller

This tutorial will show how to expose TCP or UDP services running in your Kubernetes cluster such as MySQL or any other database with the Nginx Ingress Controller. As you may know, the Kubernetes Ingress caters exclusively for HTTP and HTTPS traffic. If you want to expose other kind of

Kubernetes Free TLS Certificate Management

Kubernetes Free TLS Certificate Management

How to Create and Manage TLS Certificates for Free on a Kubernetes cluster with Nginx and cert-manager. Using HTTPS to publish your website or expose your API is a must nowadays. Luckily, long gone are the days where you needed to spend hundreds of dollars and time to create and

Install Nginx Ingress Controller on Kubernetes and MicroK8s

Install Nginx Ingress Controller on Kubernetes and MicroK8s

Nginx is the most popular Ingress Controller with Kubernetes. We find it in many Kubernetes distributions enabled by default. In this post, I will show you install and configure the Nginx Ingress Controller in few steps. Existent Installation Check Before going ahead and installing the Nginx Ingress Controller, we verify

Will be back

End of last year I was dishing out blog posts regularly. Then it came Christmas and I decided to wrap up some very interesting articles on Kubernetes. The problem was that I started too much at one go and eventually never completed. Google Search was kind enough to send me

Easiest Kubernetes Install ever! Certified Kubernetes with just one command line

Easiest Kubernetes Install ever! Certified Kubernetes with just one command line

Kubernetes has a fairly complex architecture. For years, developers and operators shied away from trying it out because of its complex installation. Its popularity pushed the community to find ways to simplify this process and tools like kubeadm were created. However, even kubeadm is not straightforward for most. Today I

The secret recipe of successful Agile and DevOps

The secret recipe of successful Agile and DevOps

For years, I wanted to write about my take on Agile and DevOps. I never did because I feel there is no value in expressing an opinion if it’s not backed by facts. Today, I am finally in the position of sharing my opinion after having tried and tested

Install Wordpress on Kubernetes

Install Wordpress on Kubernetes

WordPress is without doubt the leading content management tool on the internet. It’s simple to use and it has an endless set of features and plugins. However, its setup and upgrade are not always straightforward. Today, I will teach you how to run it in just few minutes on

Enable X-Forwarded-* Headers in Kubernetes Nginx Ingress Controller

Enable X-Forwarded-* Headers in Kubernetes Nginx Ingress Controller

If you experienced some issues with your application not redirecting to HTTPs or the correct host on Kubernetes, you are not alone. While refreshing some clusters, I started experiencing this issue as well. I immediately checked the configuration of my Load Balancer but it looked perfectly fine. After digging through