Be aware that the kernel limits the number of watches. You can see the limit in /proc/sys/fs/inotify/max_user_watches which is usually set to 8192. This means lsyncd cannot watch more than 8192 directories unless you change the kernel setting. Lsyncd itself has no limits.なんだって。 なのでsysctl.confに fs.inotify.max_user_watches = 65536を書いて sudo sysctl -p