U盘启动Openwrt

Openwrt版本为OpenWrt Chaos Calmer 15.05

一、安装需要的包

opkg update

 opkg install block-mount kmod-fs-ext4 kmod-usb-storage-extras

二、挂载U盘

把U盘进行格式化成ext4

mount /dev/sda1 /mnt

tar -C /overlay -cvf - . | tar -C /mnt -xf -

umount /mnt

三、写入命令

block detect > /etc/config/fstab; \
   sed -i s/option$'\t'enabled$'\t'\'0\'/option$'\t'enabled$'\t'\'1\'/ /etc/config/fstab; \
   sed -i s#/mnt/sda1#/overlay# /etc/config/fstab; \
   cat /etc/config/fstab;

查看fstab文件，配置是否和下面一样

 vi /etc/config/fstab

config 'global'
        option  anon_swap       '0'
        option  anon_mount      '0'
        option  auto_swap       '1'
        option  auto_mount      '1'
        option  delay_root      '5'
        option  check_fs        '0'

config 'mount'
        option  target  '/overlay'
        option  uuid    'c91232a0-c50a-4eae-adb9-14b4d3ce3de1'
        option  fstype  'ext4'
        option  enabled '1'

config 'swap'
        option  uuid    '08b4f0a3-f7ab-4ee1-bde9-55fc2481f355'
        option  enabled '1'

config 'mount'
        option  target  '/data'
        option  uuid    'c1068d91-863b-42e2-bcb2-b35a241b0fe2'
        option  enabled '1'

检查能否挂载成功

root@OpenWrt:~# mount /dev/sda1 /overlay
root@OpenWrt:~# df
Filesystem           1K-blocks      Used Available Use% Mounted on
rootfs                     896       244       652  27% /
/dev/root                 2048      2048         0 100% /rom
tmpfs                    14708        64     14644   0% /tmp
/dev/mtdblock6         7759872    477328   7221104   6% /overlay
overlayfs:/overlay         896       244       652  27% /
tmpfs                      512         0       512   0% /dev
/dev/sda1              7759872    477328   7221104   6% /overlay
root@OpenWrt:~#

重启路由器完成操作

root@OpenWrt:~# df
Filesystem           1K-blocks      Used Available Use% Mounted on
rootfs                 7759872    477328   7221104   6% /
/dev/root                 2048      2048         0 100% /rom
tmpfs                    14708        64     14644   0% /tmp
/dev/mtdblock6         7759872    477328   7221104   6% /overlay
overlayfs:/overlay     7759872    477328   7221104   6% /
tmpfs                      512         0       512   0% /dev
/dev/sda1              7759872    477328   7221104   6% /overlay
/dev/sda3            242846048    163864 230323224   0% /data
root@OpenWrt:~#

参考：https://wiki.openwrt.org/doc/howto/extroot

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