The 50000-51000 docker-compose port range spawned ~2000 docker-proxy
host processes (~3.5 GB RSS) under Docker's default userland-proxy.
The 1001-port pool was symptom treatment — collisions only matter for
multi-VP-on-shared-bind, but the cost was paid by every install.
Each VP now gets a non-overlapping 10-port slice computed from its id
(VP 1 -> 50000-50009, VP 2 -> 50010-50019, ...). Class constants are
gone; VirtualPrinterFTPServer takes passive_port_min/max instance args.
Wraps modulo PASSIVE_MAX_SLOTS = 100, with the existing 10-attempt
random retry as same-slot collision fallback.
Compose default narrowed to 50000-50029 (3 VPs). Proxy-mode VPs forward
the real printer's full range and stay on the separate TCPProxy
constants. Compose comment rewritten to acknowledge Linux multi-service
hosts as a primary bridge-mode audience and drop an over-stated
"confirmed by reporter" claim about userland-proxy=false.
maziggy
d597d36d5b