# umount /dev/sda2
umount: /: target is busy.
perhaps
umount: /dev/sda2: device is busy
This is because some users are using files on the current disk. There are two solutions:
① Force uninstall (not recommended)
umount -l /dev/sda2
② After confirming with the user, close the processes related to these open files
see:
lsof /dev/sda2
Kill program:
lsof /dev/sda2 | awk ‘{print $2}’ | xargs kill -9
Uninstall:
umount /dev/sda2
Errors are reported as follows:
umount /data/nginx/html/pc/static
umount.nfs4: /data/nginx/html/pc/static: device is busy
1. Through fuser, See which process is occupying the file
fuser -m -v /data/nginx/html/pc/static/test
– M indicates the file system or block device (in mount state) where the specified file is located. All processes accessing the file system are listed
– V indicates verbose mode. The process is displayed in PS mode, including PID, user, command and access fields
If the prompt: – bash: fuser: command not found, it indicates that there is no corresponding package,
Solution:
yum install psmisc -y
2. Kill the corresponding process,
kill -9 Corresponding process code
3. Cancel the mount again
umount /data/nginx/html/pc/static