Recent articles

Deploy APIs from your CI/CD pipeline with the 3scale REST API

In the past years, I spent time (maybe too much) designing and implementing CI/CD pipelines around 3scale. This led to the birth of the threescale_cicd ansible role. I also helped on the design of the 3scale_toolbox and crafted a Jenkins shared library as well as sample CI/CD pipelines using the 3scale_toolbox. I had the opportunity to train colleagues and transmit this knowledge but I never took the time to set it down on paper. Continue reading

Consistent DNS name resolution for virtual machines and containers

When developing on microservices, developers need to run a mix of software. Some of them running in containers, others in virtual machines, some others in the cloud and the rest on the developer’s workstation. Microservices having a lot of connections between themselves in addition to technologies such as TLS or OpenID Connect implies DNS names to be consistent. Consistent DNS names means that no matter if a client on the developer workstation, on a VM or on a container, trying to reach a server on the developer workstation, on a VM or on a container, the server DNS name must always be the same. This article explains how to setup a developer workstation on Fedora, with Libvirt VMs and Podman containers and achieve consistent DNS name resolution. Continue reading

Deploy OpenShift Single Node in KVM

Starting with version 4.8, OpenShift can now officially be installed on a single virtual machine (instead of three). This effectively lowers the resources requirements and open up new possibilities for home labs or developer workstations. This article explores how to deploy OpenShift Single Node (SNO) using KVM on your Fedora workstation. Continue reading

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