The desktop failed to start in a browser that had cached noVNC 1.6
from the Debian desktop image: its vnc.html, which has no clipboard
Clear button, ran the Ubuntu image's 1.3 ui.js, which wires one up
and threw "Cannot read properties of null". websockify sends only
Last-Modified, so browsers cache noVNC on a guess, and it answers a
revalidation with 304 when the file on disk is older than the copy.
Serve noVNC through websockify-no-store, which adds Cache-Control:
no-store to every response, and from /novnc/ rather than /, so no
browser holds a stale copy at the paths the desktop now uses.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
kubestronaut-sim runs each exam task on a host of its own - a kind (kubeadm)
cluster in rootless podman, or a QEMU/KVM Ubuntu VM for the CKS tasks that
need their own kernel (Falco, AppArmor) - and puts a browser desktop in front
of them, the way killer.sh and sailor.sh do.
- ksim, sim/: the engine (sessions, drills, study mode, grading, coverage,
audit), host and VM lifecycle, the desktop
- images/: exam host images (common, CKS variant with its tools, VM guest)
- cka/ (131 tasks), ckad/ (105), cks/ (110): task banks, curricula with
study notes, reference solutions and scripted solutions
Every domain of every track has at least 17 pool tasks. `./ksim audit` proves
a task three ways: it seeds cleanly on its own host, scores nothing before
anyone has worked on it, and reaches full marks when its scripted solution is
run on the host as `candidate`. All 346 tasks pass (CKA audited 2026-10-13,
CKAD and CKS 2026-10-12).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JZPd3GGWyxTgAkL6a4gAJz
