Short, honest write-ups of the ideas that come up in interviews and on the job. Each one teaches the concept properly, cites the Microsoft documentation, and points back to the class that drills it until it sticks.
Most lists of in-demand skills are a pile of buzzwords with no shape. Here is the shape: one direction things are moving, the skills moving with it, and a few worth quietly letting go.
The distance between resetting passwords and running production infrastructure is real, but it is smaller than it looks — and none of it is the part people spend their nights worrying about.
A budget is the thirty-second insurance policy against a runaway cloud bill — it emails you as actual or forecasted spend climbs toward your threshold. The catch everyone misses: it warns, it does not stop the spending.
A private endpoint is how you consume a service privately; Private Link Service is the mirror image — how you publish yours, behind a Standard Load Balancer, so customers connect over a private endpoint instead of a public IP. The pattern behind private SaaS on Azure.
The oldest sin in web apps is a password in a config file. Key Vault references delete it with no code change: the app setting stops holding the secret and starts pointing at it, resolved at runtime by a managed identity.
Running one VM is easy; running forty identical ones that add and remove themselves with demand is a job you do not want to do by hand. A scale set is Azure doing it from a single image — the building block under autoscale and AKS node pools.
The scariest moment in running a web app is the deploy. Slots turn it into a non-event: push to a warm staging copy, swap it into production with nothing dropped, and swap straight back if the new build misbehaves.
They share a portal and get confused constantly, but they answer opposite questions. Backup is a time machine for your data; Site Recovery is a standby engine that keeps the whole workload running when a site goes down. Most estates need both.
One workspace per team, per environment, per region? Microsoft's answer is blunt: start with one and split only when a hard requirement forces it. The real drivers are residency, access, retention, and cost — not the org chart.
Most traffic is encrypted now, which is great for privacy and terrible for a firewall reading nothing. The Premium tier adds TLS inspection and a signature-based IDPS so it can open the tunnel and match what is really flowing against known attacks.
Both route users to the nearest healthy region — but Front Door stands in the traffic path with a CDN, TLS offload, and a WAF, while Traffic Manager just answers a DNS query and vanishes. Which one you need depends entirely on where it sits.
Give a VM a public IP and open port 3389, and the internet's bots start guessing passwords within minutes. Bastion is how you get a shell on a private VM over TLS from the portal — no public IP, no open management port, no jump box to patch.
Your VMs need to reach the internet without wearing a target. One managed resource gives a whole subnet a clean, private way out through static IPs — and quietly fixes the SNAT-port-exhaustion bug most people only meet at 2am.
Every connection starts with one question: what IP is this name? Public zones answer the internet, private zones answer your virtual network, and a surprising amount of "the network is down" turns out to be DNS in a trench coat.
It does not read your requests — it reads your connections. A layer-4 look at how Azure spreads TCP and UDP across a backend pool, skips the sick instances with health probes, and where Application Gateway takes over.
A datacenter losing power and a whole geography going offline are two different disasters. A zone protects you from one, a second region from the other — here is which insurance your workload actually needs.
The moment your Bicep grows past a toy, one giant file becomes unreadable and you start pasting the same block everywhere. Modules are how infrastructure-as-code learns what every programmer knows: factor it into reusable functions.
Someone with legitimate delete rights fat-fingers the wrong resource group and the production database goes with it. Resource locks make that specific disaster impossible — even for people who are allowed to delete.
People say "Azure DevOps" meaning the pipeline, but that is one of five services. The suite covers the whole journey a feature takes — planned, coded, built, tested, shipped — and the integration is the point.
Your datacenter needs to talk to Azure. You can send that traffic through an encrypted tunnel over the public internet, or over a private circuit that never touches it — shared road or private rail.
Sizing a server for your worst hour means paying for that hour all day. Autoscale flips it: the app grows instances when the crowd arrives and gives them back when it leaves — the elasticity you moved to the cloud for.
You need to let one client read one blob for one hour — without handing over the master key to your whole storage account. A shared access signature is exactly that: scoped, time-limited access baked into a URL.
Terraform's state file is the ledger of everything it built — and by default it sits on one person's machine. In a team, that is a corruption or a deleted file away from disaster. The fix is a remote backend in Azure Storage.
Every VM needs a disk, and Azure gives you a spectrum from bargain spinning-platter to blistering SSD. Choose the wrong end and you overpay for speed you never use, or throttle the workload you were trying to run.
Hosting a web app used to mean owning a server — patching an OS, praying on release night. App Service takes all of that off your plate and leaves the one thing that matters: your code.
One subscription is easy to govern. Fifty is a nightmare if you configure each by hand. Management groups are the layer above subscriptions where you set a rule once and let inheritance push it to all of them.
You built an image; now it needs a home your pipeline can push to and production can pull from — privately, securely, close to where it runs. That home is a registry, and Azure's is ACR.
The create dialog asks for a "type" before you have stored a byte — and unlike most Azure settings, you cannot change it later. What the choices mean, and why standard general-purpose v2 is almost always right.
Sooner or later two Azure networks need to talk. Peering lets them — privately, over Microsoft's backbone, no gateway, no public internet. There is just one rule (non-transitivity) that surprises everyone.
Collecting telemetry is worthless if nobody looks until a customer complains. An alert rule watches the data; an action group decides who gets told and what happens next — three alerts that fire beat forty that get muted.
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