Recent articles

How to run performance tests with K6, Prometheus and Grafana

K6 is a novel performance testing tool written in Go, using plain Javascript for the test definition and presenting the test results through Grafana. An existing article written in 2018 explains how to setup K6 with InfluxDB and Grafana, however Prometheus gained popularity over InfluxDB since then. Proper integration of K6 with Prometheus is a clear lack identified by the community. Here I explain how to integrate K6 with Prometheus using the existing StatsD support in K6, present the Grafana dashboard I built, and show how to use it. This integration fills a gap and provides a quick win for companies already using Prometheus. Continue reading

Build your own distribution based on Fedora CoreOS

Fedora CoreOS is a new Linux distribution from the Fedora Project that features filesystem immutability (you cannot change the system while it is running) and atomic upgrades (you cannot break your system if there is a crash or power loss during the upgrade). Upon installation, Fedora CoreOS (FCOS) can be tailored to your needs using Ignition files. Once installed, you can install RPMs, tweak configuration files, etc. This article tries to explore Fedora CoreOS customizability one step further by building your own distribution based on Fedora CoreOS. The idea would be to have everything wired in the Operating System image and minimal configuration in the Ignition file. Continue reading

Use JMeter to assess software performances

One of my side projects (the Telegram Photo Bot), have some performance issues that I will have to tackle. I could have jumped into the code and changed something, hoping it will improve performances. But that would be ineffective and unprofessional. So, I decided to have an honest measure of the current performances as well as a reproducible setup to have consistent measures over time. Continue reading

A cleanup playbook for 3scale

If you are running integration tests embedding 3scale or are doing a lot of 3scale demos, you might sooner or later have plenty of services declared in the 3scale Admin console, which could reveal difficult to work with. And with the new feature named API-as-a-Product, there are now Backends and Products to delete, making the cleanup by hand a bit tedious. This article explains how to cleanup a 3scale tenant using Ansible. Continue reading

Install Kubernetes operators in OpenShift using only the CLI

OpenShift 4 went all-in on Kubernetes operators: they are used for installation of the platform itself but also to install databases, middlewares, etc. There are more and more operators available on the Operator Hub. Most software now provide an operator and describe how to use it. Nevertheless, almost every software documentation I read so far, includes the steps to install the operator using the nice GUI of OpenShift 4. But since my OpenShift environments are provisioned by a playbook, I want to be able to install operators using the CLI only! Continue reading