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e7dfe9c7c4
Docker node stop took ~5s every time. The stop API grace period
(params t=5, unchanged since 2015) was always exhausted: the business
process (often an interactive shell) ignores SIGTERM, and GNS3 doesn't
depend on graceful shutdown — _fix_permissions and /gns3volumes already
persist container state before stop() is called.
Use POST /containers/{id}/kill (SIGKILL, zero delay) instead of stop.
The 409 (container already stopped) replaces the previous 304 handling
for the race where the container exits between the state check and the call.
t=5 traced to commit 33edbefa3 (2015-10-14) "Docker cleanup and
improvements" — introduced with no recorded rationale.