设置devlabel规则
每次USB插入时，linux创建的设备文件可能不一样，有时候是/dev/sdb1有时候是/dev/sdc1,可以用fdisk -l命令查看。所以需要为usb建立label不管设备文件是哪个，都有一个固定的label的连接指向它。
先用udevadm info -a -p $(udevadm info -q path -n /dev/sdb1)查看U盘信息，再在/etc/udev/rules.d/下面新建一个文件如：11-usb-serial.rules，写入：
DRIVERS=="usb", SYMLINK+="usb"如果希望做更多的限制，可以参考Writing udev rules
这样每次U盘插入时就会生成一个如下的软连接：
lrwxrwxrwx 1 root root 4 May 31 12:34 /dev/usb -> sdb1设置自动加载
安装autofs工具：sudo yum install autofs
配置/etc/auto.master：
## Sample auto.master file# This is a 'master' automounter map and it has the following format:# mount-point [map-type[,format]:]map [options]# For details of the format look at auto.master(5).#/home/aqui/mnt /etc/auto.usb## NOTE: mounts done from a hosts map will be mounted with the# "nosuid" and "nodev" options unless the "suid" and "dev"# options are explicitly given.##/net -hosts## Include /etc/auto.master.d/*.autofs# The included files must conform to the format of this file.#+dir:/etc/auto.master.d## Include central master map if it can be found using# nsswitch sources.## Note that if there are entries for /net or /misc (as# above) in the included master map any keys that are the# same will not be seen as the first read key seen takes# precedence.#+auto.master新建/etc/auto.usb：
usb -fstype=auto,rw,nosuid,nodev :/dev/usb这样每次U盘插入时就会自动mount到/home/aqui/mnt/usb
还可以修改/etc/autofs.conf里的timeout来设置mount point空闲多少秒之后自动umount
最后，输入以下命令设置开机自启和重启autofs：
sudo systemctl enable autofssudo systemctl restart autofs