Replaces a bare nohup on irv-ml1:8410 that would not have survived a reboot,
handed over by waterland-dev. Tracks vh/waterland @ main (PR #4 merged; main
HEAD is exactly the pinned 8025366).
Build context is a checkout at /opt/waterland-studio/src, deliberately OUTSIDE
the compose dir — deploy-stack.sh rsyncs stacks/<stack>/ with --delete and
would otherwise eat it. The Dockerfile is passed out-of-context.
Three landmines, all measured:
1. Both uv extras are load-bearing at build AND run. jobs.py shells the
renderer out as a literal with no --extra flags, so uv
would re-sync at runtime and prune cupy — silently dropping to the numpy
path at ~21x wall time. UV_NO_SYNC pins it; UV_OFFLINE makes any failure
loud instead of quietly slow.
2. cupy needs CUDA HEADERS for its NVRTC compile, not just the driver and the
wheel's runtime libs. The host has a system CUDA toolkit so the nohup
process found them by accident; a slim image does not, and every render
died 1.7s in with 'Failed to find CUDA headers' printed through argparse's
usage banner — which reads like a CLI bug, not a missing toolkit. Fixed
with cupy-cuda12x[ctk] (hundreds of MB, vs ~6 GB for a -devel base).
3. The A6000 is host device 1 but container device 0, since compose exposes
exactly one GPU. CUDA_VISIBLE_DEVICES_TARGET=0 inside; copying the host's
value selects a device that does not exist.
/root/.cupy is a volume because the NVRTC compile costs ~17s: verified at
23.3s cold vs 6.1s warm, and re-verified across a restart (23.2s on a fresh
cache volume, 6.0s once populated). Warm 256^2+anim beats the 7.4s recorded
against bare metal, so containerising cost nothing.
Job store seeded with the 4 jobs from the displaced instance. Serial by design
(one replica, one card) and unauthenticated, so it stays LAN/WireGuard-only.
vh
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