umount.nfs: device is busy

Issue You need to unmount a volume, but after using your command to umount it, you get this error: root@myserver:~ # umount /var/www/shared/ umount.nfs: /var/www/shared: device is busy No need to use the –force option, you must find the root cause. Solution This means that a process listens where you want to perform your action, you have to identify it and see to kill it. To do this, use the lsof command which allows you to have the list of processes listening on the desired tree