Error

 Unable to monitor directories for changes because iNotify max watches exceeded

Context

I got the error after using the following command

rails generate migration addCommentsToProducts

OUtput

Solution

As the error message says, in order to solve the issue of inotify max watches being exceeded on Ubuntu, we can increase the number of inotify watchers.

Open a terminal

check the current value of inotify watchers with:

cat /proc/sys/fs/inotify/max_user_watches

Output

Increase the number of watches

sudo sysctl fs.inotify.max_user_watches=524288

OUtput

Make the change permanent

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

Output

Apply changes

sudo sysctl -p

Output

Try again

Now, you should be able to use the Rails generator or your command without encountering the inotify error.

Output

Done