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2bee34031c
Add a read-only _check_host_readiness() that runs once after the Docker daemon connection is established. It reads /proc/sys inotify/file-max limits and /proc/filesystems (for FUSE), and logs a warning with the exact commands to fix when they are too low for heavy containers -- XRd wants ~4000 inotify instances per node against a stock default of 128. The server runs unprivileged (only the setuid ubridge helper has root), so it can only check, not set; the warning tells the admin exactly what to raise once. Stays silent when the limits are already sufficient.