how to enable usb on openwrt after upgrade version

you should learn it before this.

1. enable usb

   opkg update
   
   opkg install ca-certificates coreutils-nohup fdisk  e2fsprogs kmod-fs-ext4 kmod-usb-storage kmod-usb-storage-extras
   

   then, use fdisk and mkfs.ext4 to enable it.

2. maybe need a monitor script

   cat /v2.sh
   #!/bin/sh
   v2=$(ps|grep v2ray|grep -v grep|awk '{print $1}')
   if [[ -z "$v2" ]]
   then
       cd /usb/v2ray_armv7 && nohup /usb/v2ray_armv7/v2ray -config /usb/v2ray_armv7/config.json &
   fi
   

3. automount

   echo "mount /dev/sda1 /usb" >> /etc/rc.local
   crontab -l |(cat;echo "*/1 * * * * /v2.sh")| crontab -