Jun 16How to successfully apply at GSoC (and other similar efforts )[ This used to be a draft on my hard disc for much too long ] For over 15 years there is Google Summer of Code (GSoC) and each year in spring there is the same ritual: students apply to the various mentoring organisations in the hope to be part…Gsoc3 min readGsoc3 min read
May 22A small tale about testing and what a coffee machine has to do with itI am a big fan of testing in production. That does not mean I don’t test via unit test or in staging, but all those environments are different enough from the production environment, that they only (may) give hints if the production code will work or not. Last week our…Testing3 min readTesting3 min read
Published inITNEXT·Aug 17, 2022Distributed Tracing with Quarkus, Python, Open Telemetry and Jaeger (Part 3)The last two parts (1, 2) of this series focussed on Tracing basics and instrumentation of Quarkus and Python code for http requests. A very popular mechanism for data transfer is Apache Kafka. In this post, we’ll look at how to instrument code for use with Kafka and get trace…Opentelemetry5 min readOpentelemetry5 min read
Published inITNEXT·Aug 10, 2022Distributed Tracing with Quarkus, Python, Open Telemetry and Jaeger (Part 2)In the last part we looked at instrumenting some Quarkus and Python code to obtain traces, which we forwarded to Jaeger. Unfortunately, the two were not connected and thus we could not get the full picture. Let’s fix that. Each trace as well as each span has a unique ID…Opentelemetry4 min readOpentelemetry4 min read
Published inITNEXT·Aug 10, 2022Distributed Tracing with Quarkus, Python, Open Telemetry and Jaeger (Part 1)In a microservices world, there is no easy way of attaching a debugger or profiler to one component to understand why it exposes a certain behaviour. Profiling one component may reveal that it is someone elses problem. I have worked in the past with OpenTracing, but as this is now…Opentelemetry6 min readOpentelemetry6 min read
Published inITNEXT·Jun 6, 2022My toolbox: WiresharkIn my previous toolbox article I talked about HttpToolkit and how awesome it is to see http requests in action. There is an older tool, which is probably the Swiss Army knife of network debugging tools (and yes, I am old enough to have contributed to its predecessor tcpdump), Wireshark. …Wireshark3 min readWireshark3 min read
Published inITNEXT·May 10, 2022Using Minikube on M1 MacsOn x86-based CPUs it is quite normal to run Linux containers and also Kubernetes. With the new M1-CPU based Macs, there are still challenges. There are instructions on the Minikube homepage, which even mention M1-Macs, but did not work for me. The following is how I got going: First I…Apple2 min readApple2 min read
Published inITNEXT·Apr 27, 2022My toolbox: HttpToolkit[ This is the first article in an upcoming series of toolbox ones that showcase some of the tools I use in my development work ] Often enough I need to find out the details of HTTP requests to reverse-engineer some API or to understand error responses where my used…Development3 min readDevelopment3 min read
Published inITNEXT·Apr 25, 2022How to use request-scoped tokens with cachingIn a project I am working on I need to get tokens from a single-signon (SSO) -server to be able to talk to another service. That token has a limited lifespan and needs to be refreshed from time to time. The setup here is relatively simple. And in theory My…Quarkus2 min readQuarkus2 min read
Published inITNEXT·Nov 15, 2021(Re)introducing x2svgBack in the day, in 2008 to be more concrete, I needed to visualise data structures like DTDs or XML schemas. I created x2svg and put it on SourceForge. Fast forward to fall of 2021. I am looking into JsonSchema and Avro and need a way to visualise the long…SVG2 min readSVG2 min read
