9 July 2026
Cheat sheets for the AZ-900, AZ-104, AZ-204, and AZ-400 Microsoft certification exams, covering cloud fundamentals, identity/storage/networking, App Service/Functions/Service Bus, and CI/CD pipelines and release strategies respectively.
Tagged “az-400”
← All articles3 July 2026
Seven Microsoft certifications in a year, capped off with AZ-305: the actual order taken vs. the order recommended in hindsight, and why AZ-104 → AZ-305 back-to-back makes the most sense.
14 June 2026
A full AZ-400 cheat sheet: DevOps terms and definitions, branch strategies, tooling, deployment strategies, and test types.
10 June 2026
Why building a personal website during AZ-400 prep was one of the best calls made: real custom domains, TLS, and production-like deployments for demos turned abstract Azure concepts into a genuine portfolio.
9 June 2026
14k impressions and 88 reactions on a post about the AZ-400 lab's unclear instructions — including one comment from someone who failed the exam for the same reason, which is exactly why the AZ-400 cheat sheet followed the next day.
4 June 2026
Renewing AZ-204 in about 30 minutes on memory alone, right after passing AZ-400 — next up, full focus on AZ-305's architecture and governance content.
3 June 2026
The full story behind the AZ-400 lab quick-start tip: confused by a blank-desktop VM with no visible browser, until the taskbar's quick-start Edge icon revealed the way into the Azure Portal and Azure DevOps.
29 May 2026
Six Microsoft certifications in twelve months of evenings and weekends, capped by an 863/1000 score on AZ-400 — the certification order so far, and AZ-305 up next.
24 May 2026
When Whizlabs and Tutorials Dojo hadn't caught up to the April 2026 AZ-400 exam update (hybrid CI/CD, GitOps with Flux v2 + ArgoCD), generating custom scenario questions with AI to fill the gap — including one where the AI itself got a nuanced hybrid setup wrong first.
23 May 2026
80% on the Whizlabs AZ-400 final mock, first attempt, 5 days before the real exam — solid improvement from earlier practice tests after focusing hard on weak areas.
19 May 2026
Building the blue/green + feature-flag demo for AZ-400 practice: adding a user header, moving a feature from an env variable to an App Configuration flag — and the real debugging story, a 502 traced to GitHub Actions mangling a multi-line prompt.
16 May 2026
Building a reusable Azure DevOps YAML pipeline for a small .NET helper library: AI-assisted (Aider + Qwen2.5) unit tests, automated SemVer NuGet packaging to GitHub Packages, restore caching, a dotnet format style gate, and the Cache@2 quirk that needed a manual mkdir to fix.
7 May 2026
The build log for koorevaar.com itself: three evenings from buying the domain to a portfolio built with Aider+Qwen2.5, GitHub Actions pipelines, and a Terraform-deployed Azure Container Apps text-analysis demo behind a Cloudflare Worker + phi3:mini.
2 May 2026
A 60-second canary deployment demo: traffic split at the ingress controller between blue and green environments, plus a sticky-session example, all served over a real HTTPS production URL.
2 May 2026
Week 3 of an AZ-400 side project: a full Terraform + AKS + Traefik pipeline covering infrastructure, blue/green + canary deployment, and teardown — with real execution times for each stage, down to seconds for a blue/green traffic switch.
27 April 2026
A permanent, always-HTTPS demo domain that costs almost nothing when idle: a Cloudflare Worker + KV serves a static placeholder page, then instantly re-routes to a freshly provisioned AKS backend the moment a new ephemeral demo starts.
26 April 2026
The first working blue-green deployment on AKS for AZ-400 practice: three pipelines split across infrastructure provisioning, deployment, and Traefik IngressRoute-based promotion between two Git-branch environments.
25 April 2026
Adding a detect-language endpoint to the sentiment API, backed by AI-assisted unit tests (Aider + Qwen) that also run on main, a feature-branch flow set up for blue-green then canary, and a Flask route-ordering gotcha (routes must be defined before the blocking app.run() call).
19 April 2026
The sentiment API goes live via a real two-pipeline, cross-subscription Azure DevOps setup: Terraform cluster creation feeding a second deploy pipeline through cross-pipeline artifact passing, arm64/amd64 cost-split nodepools, end-to-end deploy in 2 minutes.
11 April 2026
From sandbox success to a full CI/CD pipeline in a day: Terraform for AKS, Spot nodepools, a clean LLM-adapter pattern, Traefik on ARM64, ConfigMap-driven prompts, and a cross-subscription, bootstrap-plus-main-stage pipeline — all on €45 of remaining credits.
10 April 2026
The first working milestone: a self-hosted sentiment-analysis service running in the Whizlabs AKS sandbox — Terraform + PowerShell automation, a multi-container Ollama/LLM-adapter/Flask architecture, and ConfigMap-driven prompts with proper health probes.
5 April 2026
Kicking off a self-hosted LLM sentiment-analysis platform on AKS: a Flask API, an LLM adapter layer, Ollama (phi3:mini) in-cluster, Terraform for IaC, and Traefik ingress via Helm — the plan before any of it exists yet.