proper nfs umount

Hi

if you try to umount an NFS mountpoint this way

root:~> umount /mountpoint

and your shell answer this way

umount: /mountpoint: device is busy
umount: /mountpoint: device is busy

then try killing all processes using the mountpoint and update the nfs export fs

root:~> fuser -k -m /mountpoint
root:~> exportfs -au

at this point, you can safely umount

root:~> umount /mountpoint

peace!

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