There may be simpler possibilities for installing ElasticSearch on Docker. However, here, we will choose a way that can be easily expanded for production use: the installation of ElasticSearch on Kubernetes via Helm charts. While installing ElasticSearch using Helm implements…
Kubernetes (8) – Automatic TLS Certificates signed by Let’s Encrypt
In this tutorial, we will expose a kubernetes application via HTTPS with a valid Let's Encrypt certificate. A certificate manager will help us to automatically receive and provision a trusted TLS certificate. It is trusted since Let's Encrypt has signed the…
Kubernetes (7) – Ingress Controller on a multi-node Cluster (HTTP + HTTPS)
You will find here step by step instructions on how to install an ingress controller on a Kubernetes multi-node cluster with an example application on both, HTTP and HTTPS. In our last blog post, we have installed a Kubernetes Ingress…
Kubernetes (6) – HTTPS Applications via Ingress Controller on Minikube
In this blog post, we will show how to create Kubernetes HTTPS applications with a redirection from HTTP to HTTPS. For that, we will create a and mount a self-signed wildcard certificate to an NginX-based Kubernetes ingress controller. We will…
Kubernetes (5) Local Persistent Volumes – A Step-by-Step Tutorial
Kubernetes local volumes go beta. However, what is it, a Kubernetes local volume? Last time, we have discovered, how to use Kubernetes hostPath volumes. However, we also have seen, that hostPath volumes work well only on single node clusters. Here,…
Kubernetes (4): Persistent Volumes – Hello World
In this blog post, we will start our first persistent kubernetes application. In our role as an administrator, we first will create a persistent volume. Then, in our role as a developer, we will create a persistent volume claim. Later,…
Kubernetes (3) – Installing a Kubernetes Cluster with kubeadm
In the blog post, we will learn how to create a kubernetes cluster with the help of kubeadm. We will deploy a Kubernetes master on a CentOS system before we will join a second CentOS system as Kubernetes Node. After describing…
MYSQL Backup & Restore on OpenShift
Two weeks ago, I have created a WordPress installation on an OpenShift test system. It is very convenient that OpenShift has provided me with persistent volumes for WordPress and database. However, those volumes are not easily accessible on the OpenShift…
Hello World Kubernetes Service on Minikube – Kubernetes Series (2)
This is part 2 of a series on Kubernetes a la minikube. Minikube is (probably) the easiest way of installing a small Kubernetes system including a graphical user interface. In part 1 we have shown how to install such a system on…
WordPress Password Reset through Database Update or WP CLI
In this post, I have summarized how I have performed a password recovery of a WordPress installation. I have followed the instructions here. I have performed a WordPress password reset via database (Step 1 through 6) as well as a WordPress password…
Kubernetes (1) – Installing Minikube on CentOS
In this blog post tutorial, we will learn, how to install a single node Kubernetes cluster via minikube. We will install minikube on CentOS 7 natively without the need for any virtual machine layer. This post is inspired by the…
Installing WordPress via OpenShift
If you happen to have access to a running OpenShift installation, this blog post can help you to install a WordPress in a quick and convenient way. In other cases, you can either check out one of our "HowTo install Openshift" tutorials…
Install WordPress via Docker Compose
In this blog post, we will learn how to install a WordPress solution via Docker Compose. The solution consists of a MySQL container and a WordPress container. We will show, how to install Docker and Docker Compose. before we define the…
How to Install OpenShift on Fedora – a Quick Installation Guide
Are you reviewing Docker orchestration systems like Kubernetes, DC/OS or OpenShift? In this blog post, let us learn how to install a standalone OpenShift Origin system on Fedora. OpenShift Installation on Fedora is a tough nut. As an example, read this…
How to get rid of nested Subscriptions using RxJS flatMap and switchMap
"Nested subscriptions are bad programming style". That is, what many programmers tell us. But: how can we get rid of nested subscriptions? In this little step-by-step tutorial, we will demonstrate how to use flatMap to improve an Angular 6 based REST…
Consuming a REST Service with Angular 4.3+: a Step-by-step Guide
This is an earlier version of a post about consuming a REST service with Angular. A new, fully reworked version for Angular 6+ can be found here. In both versions, I describe how to use angular 4.3+ HttpClientModule. In the…
Angular 6 Docker Example
In this Angular Docker Example, we will take an existing Angular 6 application and run it in a Docker container. We will show, how to create a Docker image in a modern two-stage process. We then will spin up the application…
Decision-Making in Self-Management Organizations Using Systemic Consensus
Frederic Laloux writes in his amazing, world-changing, and ground-breaking book “Reinventing Organizations” that self-management works without consensus. “It is worth repeating that these decision-making processes work without consensus.” He continues that “for some reason, many people naturally assume that in…
Practical Application of Agility Scales’ Value Grid Tool
Imagine the following scenario. You are working as a Scrum Master with a Scrum team in a project. Your Scrum team is one of two Scrum teams in the project working together with a bunch of business analysts. The project…
The Big Picture – The Overarching Change of Mankind
There are groups of people researching different topics, each one in its own finite space, rarely looking beyond their own subject, but all related to the overarching change we are currently going through. There are people talking about modern, agile…
