Solve the device is busy problem when umount removes the mount

Generally, this problem occurs in VPS hosts that are purchased by default or have been mounted. If we need to remount or remount to another directory, we need to remove the mounted directory first and use the umount command. Remove. But sometimes there will be a "device is busy" prompt.

Solution:

fuser -km /www

According to the above script, change to our own corresponding directory, and then execute the umount removal mount command and no error will be reported.

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