**Issue**
You are trying to tail -f on a file (/var/log/messages , secure or any text file), the command is throwing the below message and command is also not working
tail: cannot watch `messages': No space left on device
**Solution**
Just edit the sysctl.conf file with vi /etc/sysctl.conf and add/change the below line.
fs.inotify.max_user_watches=16384
Then run,
sysctl -p
The issue is fixed 🙂
