Una vez obtenido el soporte USB Básico, usted querrá conectar un dispositivo de almacenamiento USB a su router, por ejemplo, una memoria USB, un disco duro USB, etc… Este artículo le dará los pasos y requerimientos para lograrlo..
Note que este artículo trata, principalmente, acerca de agregar espacio adicional a la memoria flash interna. Mover el root-fs a un espacio de almacenamiento externo se describe en el artículo extroot.
El proceso sigue el siguiente curso:
/dev/
. Por ejemplo /dev/sda
como el dispositivo, con /dev/sda1
, /dev/sda2
, … , como las particiones. O, en caso de no estar particionado ccon una tabla de particiones y tener un único sistema de archivos, puede accederse directamente dentro de i.e. /dev/sda
. Los dispositivos subsecuentes que agregue serán /dev/sdb
, /dev/sdc
y así sucesivamente. Asegúrese de que los requerimientos del sistema de archivos se cumplen al instalar los paquetes de kernel correctos para soportar los sistemas de archivo que requiere específicamente (ver Storage);/etc/config/fstab
y puede configurarlo como root file system using extroot.When your USB device is properly recognised by the system, using the proper driver kernel packages listed in Basic USB support, the following packages facilitate USB storage support:
kmod-usb-storage
required … Kernel support for USB Mass Storage devices.kmod-fs-<file_system>
required … the file system you formatted your partition in. Common examples include kmod-fs-ext4, kmod-fs-hfs, kmod-fs-hfsplus, kmod-fs-msdos, kmod-fs-ntfs, kmod-fs-reiserfs and kmod-fs-xfs.kmod-usb-storage-extras
optional … Kernel support for some more drivers, such as for SmartMedia card readers.kmod-scsi-core
Any mass storage is a generic SCSI device. ![]() | Before the Attitude Adjustment release, other optional packages included: block-hotplug for USB recognition upon plug-in and block-extroot required for rootfs on external storage. In r26314 the three opkg packages block-mount , block-extroot and block-hotplug have been merged into a single package block-mount . |
e2fsprogs
additional This package contains essential ext2/ext3/ext4 filesystem utilities for formatting and checking for errors on ext2/ext3/ext4 filesystems like mkfs.ext3, mkfs.ext4, fsck and other core utilities.The following will install USB storage support, assuming USB works already, install ext4 file system support and mount a connected USB drive, pre-partitioned with a Linux swap partition and an ext4 partition.
opkg update opkg install kmod-usb-storage block-mount kmod-fs-ext4 mkswap /dev/sda1 swapon /dev/sda1 mkdir -p /mnt/share mount -t ext4 /dev/sda2 /mnt/share -o rw,sync
Note that partitions are usually auto detected, so this should work as well using default settings:
mount /dev/sda2 /mnt/share
Another example is how to use an external usb stick with a FAT32 partition (but we'll keep ext4 support also). See also Storage.
opkg update opkg install kmod-usb-storage block-mount block-hotplug kmod-fs-ext4 kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1 mkdir -p /mnt/usb mount -t vfat /dev/sda1 /mnt/usb
You may create an empty file to indicate that the disk is not plugged in so that you don't put files directly onto NAND by doing
umount /mnt/usb #make sure the disk isn't mounted before doing this touch /mnt/usb/USB_DISK_NOT_PRESENT chmod 555 /mnt/usb chmod 444 /mnt/usb/USB_DISK_NOT_PRESENTThis will prevent only processes not running as root from writing onto NAND (see this discussion). You can of course also use this file in your own scripts.
The good news first: OpenWrt can use encrypted disks almost out-of-the-box.
The bad news is, there are some things to keep in mind.
Devices with 32 MB memory may run short of free memory. Symptoms can be that LUCI is displaying the Login page instead of the actual target page or that the out-of-memory killer starts killing tasks, so strange failures happen. Monitor the memory, e,g. using the free
command.
Decryption and encryption may slow down the system. cryptsetup benchmark
will show some numbers that can be compare for different platform. Unfortunately, only the hash algorithms work, the crypto algorithm tests currently (15.05, rampis) fail with
Required kernel crypto interface not available. Ensure you have algif_skcipher kernel module loaded.
uptime
command, details of the output are explained in this article
Using Linux hard disk encryption with LUKS is straight forward:
opkg install cryptsetup lvm2 kmod-crypto-aes kmod-crypto-misc kmod-crypto-xts kmod-crypto-iv kmod-crypto-cbc kmod-crypto-hash kmod-dm
echo sha256_generic >/etc/modules.d/11-crypto-misc
cryptsetup luksOpen /dev/encrypted_partition usbstorage_luks && mount /dev/mapper/usbstorage_luks /mnt/mountpoint
umount /mnt/mountpoint && cryptsetup luksClose usbstorage_luks
Please refer to the existing documentations, e.g.
<none yet>