Set file system event monitoring (inotify)
An event monitoring tool such as inotify can be configured for notifying processes about file system events (including file creation, deletion, and updates). The Linux system puts a limit on the number of inotify watches assigned to each user. To increase the limit, edit etc/sysctl.conf to add a line:
fs.inotify.max_user_watches =524288
Run the command:
$ sudo sysctl -wfs.inotify.max_user_watches=524288