Coding is always fun. Recently I found a coding challenge for Event Streams https://developer.ibm.com/learningpaths/ibm-event-streams-badge/event-streams-coding-challenge/. The coding challenge is simple and straightforward — is to write a Kafka consumer application based on the template code provided. There is no sample answer to verify for the expected outcome. I learned something new from this coding challenge, the example given implements ConsumerRebalanceListener, this allows developer to have greater control over the partitions and the offset of each partition for event processing.

ArgoCD is gaining its popularity in GitOps and DevOps space as de-facto tool for application deployment based on Kubernetes and Openshift. For custom domain, it is common to use Kubernetes’s ingress to register the domain name. In Red Hat OpenShift, it will be using route . There are many example…

It’s been awhile since I worked on Hyperledger Fabric. Recently I had revisited some of the materials built by my ex-teammate Jaren and Aldred and I would to use Hyperledger Explorer in order to monitor the transactions within the network. Hyperledger Explorer is relatively simple to setup, especially when you…

Recently I got involved into discussion about international traveler and one of the important element is vaccination certification. Singapore government is innovative and leveraging blockchain technology to verify the authenticity of the vaccination certification. Open Attestation Open Attestation is an open-sourced framework to endorse and verify documents using the blockchain. GovTech is…

Time passed pretty quickly. The certificates generated in previous post are soon going to expire in one week time. If previous post, I am using other domain name, but the steps to renew will be the same. Therefore it is important to renew the certificate and key and replace the…

I tend to ensure the application or service endpoint that exposed to internet is secure in connection. I have been using Let’s Encrypt to generate the certificate for past year, however the process is tedious. A simple web application needs to be developed with generated token in order to accept…

A Kubernetes operator is an application-specific controller that extends the functionality of the Kubernetes API to create, configure, and manage instances of complex applications on behalf of a Kubernetes user. It becomes more and more widely adopted by community. …

I was doing some testing on IBM Edge Application Manager (IEAM) version 4.2, one of the deployment pattern is to use IEAM to manage Raspberry Pi, as I didn’t have a physical device with me, therefore I decided to use Raspberry Pi OS as Guest OS on VMWare Fusion. …

Log is essential for developer and system engineer to understand the behaviour of application before any troubleshooting can be done. When application behaves normally, it kinda useless and occupying valuable resources such as memory and disk space. When user encountered error in using application, log becomes main source of information…