Kubernetes Cost Transparency

The cloud promises transparency into the cost of our applications and technical services. However, Kubernetes, even when managed by one of the big cloud service providers, usually gets charged as a black box, and is often used by dozens or hundreds of applications in your organization. This post outlines the necessary steps to approach cost transparency for your Kubernetes clusters from an organizational perspective, proposes a high level technical design to start with and addresses some of the more common challenges and pitfalls.

Installing Arch Linux on UEFI with Full Disk Encryption

This is a step by step guide to installing Arch Linux on UEFI with full disk encryption. It deliberately contains no unnecessary words or bling. It is havily based on the Arch Linux wiki’s installation guide so if you’re ever stuck, just refer to it and the rest of the awesome Arch wiki. Download ISO Download the latest ISO from the Arch Linux website Create Bootable USB Stick You can skip this step if you just want to run Arch Linux in a VM.

Creating Grafana Dashboards for Node.js Apps on Kubernetes

Many Kubernetes deployments include Prometheus and Grafana, so application teams can monitor their applications. While using Grafana may be relatively straightforward for many, the Prometheus data model and its query language PromQL is unknown and unintuitive to many developers. This blog post explains how to create a dashboard with a popular set of metrics for your Node.js applications on Kubernetes. Prerequisites We assume you have access to a Kubernetes cluster with the following components installed:

Efficient Navigation in Vim

When editing a file, it is quite crucial that you can navigate your cursor around rather quickly. Vim and NeoVim allow for many different ways of doing so which, depending on the situation, can be more or less efficient and useful. This article examines the different ways of moving the cursor and compares them. Here, the term “efficiency” refers to navigating the cursor with as little time and effort (i.e. the number of keystrokes) as possible.

Run a Crypto Trading Bot on Cloud Foundry

Everybody is talking about Bitcoin and its peer currencies. The hype is so great that even small investors, who have no idea about financial constructs, like myself want to get aboard the investing and trading train. That’s why I recently decided to create my own account on GDAX and try my luck. Trading, at first, was fun but I realized pretty quickly that I’m not the kind of person who wants to watch their dashboard every five minutes.

Run WordPress on Cloud Foundry

WordPress runs a huge portion of all websites on the internet. It therefore seems obvious, to run this software on Cloud Foundry. There’s just one small problem: WordPress uses the file system to store all uploaded media. On Cloud Foundry and other container based systems, that doesn’t work because the container can be restarted at any time which would remove all stored files. For that reason, we need to externalize all file storage to a separate service.

Run Docker Registry on Cloud Foundry

If you work a lot with Docker, you are probably used to the concept of having a Docker Registry which allows you to store your images in a safe place. There’s a public registry that you can use for free at Docker Store. But what if you don’t want your images to be publicly available? What if you want to have your images in a safe place that you control? The solution is to deploy a private Docker registry.

Run Ghost on Cloud Foundry

This blog runs on Ghost. It’s a pretty light weight blogging platform based on Node.js. Let’s look into how it can be run on Cloud Foundry. Create Services To run Ghost, we’ll need two services: a database and an email server. First, let’s create the database. I’m using the Swisscom Application Cloud here but you can use any Cloud Foundry provider. We’ll create a small MariaDB service which works like MySQL and therefore can be used by Ghost.

Docker for Local Development

I’m using Docker. Daily. It has become a very valuable part of my toolchain because it allows me to quickly set up any backend my applications might need to run and tear it down the second I don’t need it anymore. Gone are the days when you had to have all kinds of databases and other services installed just to be able to run your apps locally. With Docker you can do all of that and isolate it from your machine.

Manage Buckets on Cloud Foundry S3 Services

S3 is a great concept to store static files and larger BLOBs. Let’s look into how we can use it in Cloud Foundry. S3 was originally created by Amazon Web Services but by now there are many 3rd party services that are compatible with the S3 API. Some Cloud Foundry providers have S3 compatible services available in their marketplace. If they don’t, you can create your own by creating a user-provided service and adding the respective S3 credentials (e.