umount卸载失败

umount 卸载是报下面错误

[root@vue Packages]# umount /mnt
umount: /mnt: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

使用fuser查找占用/mnt 的进程

[root@vue Packages]# fuser -m /mnt
/mnt:                 3261c

若没有fuser命令，执行下面命令安装

[root@vue Packages]# yum install psmisc -y

杀死上面查找的进程 3261就是进程id

# ps aux |grep 3261
# kill -9 3261

或使用下面命令查找后直接杀死进程

fuser -m -k /mnt

再次查看 /mnt 是否被占用

# fuser -m /mnt

卸载

# umount /mnt