Listen error: unable to monitor directories for changes

Question

I am getting the following error while running my rails app in Ubuntu server

FATAL: Listen error: unable to monitor directories for changes. Visit https

Answer 1

1000 is way too small, try with 524288 as explained in the wiki page: https://github.com/guard/listen/wiki/Increasing-the-amount-of-inotify-watchers

Listen uses inotify by default on Linux to monitor directories for changes. It's not uncommon to encounter a system limit on the number of files you can monitor. For example, Ubuntu Lucid's (64bit) inotify limit is set to 8192.

and

If you are running Debian, RedHat, or another similar Linux distribution, run the following in a terminal:

echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p

If you are running ArchLinux, run the following command instead

echo fs.inotify.max_user_watches=524288 | sudo tee /etc/sysctl.d/40-max-user-watches.conf && sudo sysctl --system