How an interactive PowerShell script grew into a catalog-driven factory that stands up complete nested VCF 9.1 instances — hosts, bringup, supervisor, fleet components — from a single request form. The design rules that made it survivable, and the traps that shaped them.
Terraform has plan. Kubernetes has –dry-run. Your vRO workflows have nothing — unless you give them a validateOnly input and make the wrapper cascade it. A short argument for the single most valuable checkbox in the lab factory, with the failures it caught.
esxihostdeploy.ps1 was 400 lines of ovftool and PowerCLI behind a menu. It became a cloud template, two vRO actions and two subscriptions — and the interesting part is deciding where each behaviour belongs. The full mapping, four non-obvious decisions, and the ‘yes’ that isn’t ’true’.
Stage 2 of the lab factory: a vRO workflow that turns an environment number into a complete VCF 9.1 deployment spec, runs the installer’s own validation, starts bringup and hands back a task id — because the request dies long before the eight-hour build does. Plus how the wrapper slips the two-hour leash.