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Today I Learned as a

Support Engineer

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How to Execute Command (with Arguments) on Multiple Windows Servers using PowerShell

This PowerShell script is useful when you have access to multiple Windows servers and need to run the same command on all of them. For example, I needed to run an executable that can be found on both nodes (AppNode1, AppNode2) in path C:\scripts\myapp.exe of a multi-node cluster:

How To Catch EBUSY Event on Windows using NodeJS

Introduction During a debugging session of one of our NodeJS microservices misbehaving on a Windows Server 2019 instances, I opened the microservice log to begin investigating the faulty behavior. But when I scrolled down to the timestamp where I was supposed to start investigating, I found out that the log was full of the following…

Dotless Emails Regex Validation

Introduction One of our customers recently attempted (for reason unknown to us) to log into our platform using Okta Single Sign On (SSO) and OpenID-Connect with emails missing a top-level domain (TLD) while they could log in just fine with a standard email address. While most of us in the day-to-day use the standard email…

Hack The Box ‘Archetype’ Challenge

What is Hack The Box? Hack The Box is a website offering vulnerable machines for practising hacking skills. The goal of the ‘Labs’ are to hack into the system and capture the flag (CTF) which can be found in a text file in the desktop of a regular and an administrator user. On my pursuit…

Debugging NodeJS Microservice with Shared Storage on Kubernetes

Introduction One of our largest customer recently had a problem loading a list of resources from our web application. The problem was a blocker for the customer and required to identify the problem and provide a workaround, if possible. I was assigned the task as I was the SME in this area (NodeJS microservices, infrastructure…

Installing PiHole On Raspberry Pi 4, MicroK8s running Ubuntu 20.04 (focal)

PiHole, What’s That? The Wikipedia definition should be sufficient in explaining what the software does: Pi-hole or Pihole is a Linux network-level advertisement and Internet tracker blocking application which acts as a DNS sinkhole and optionally a DHCP server, intended for use on a private network I wanted to deploy it for a few reasons:…


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