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To err is human, but to really foul things up requires a computer.
Home Development Web PHP runkit on debian squeeze

PHP runkit on debian squeeze

The more packages you install on your OpenWRT, the more space you need. If your router has an USB port, here is a simple way to replace the JFFS flash partition with an external USB stick or hard drive.

Install packages

First, install needed modules and a few programs.

~$ opkg install kmod-scsi-core kmod-usb-core kmod-usb2 kmod-usb-storage
~$ opkg cfdisk e2fsprogs swap-utils

Plug your USB key and check kernel messages. It should give you the path to your USB drive.

~$ dmesg
usb.c: USB disconnect on device 01:03.2-2 address 2
hub.c: new USB device 01:03.2-1, assigned address 3
scsi1 : SCSI emulation for USB Mass Storage devices
Vendor: VBTM Model: Store 'n' Go Rev: 1.04
Type: Direct-Access ANSI SCSI revision: 02
Attached scsi removable disk sdb at scsi1, channel 0, id 0, lun 0
SCSI device sdb: 1001472 512-byte hdwr sectors (513 MB)
sdb: Write Protect is off
/dev/scsi/host1/bus0/target0/lun0: p1 p2 p3
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 3

Prepare USB device

Now partition & format your usb stick as follows.

~$ cfdisk /dev/scsi/host1/bus0/target0/lun0/disc
cfdisk (util-linux-ng

Disk Drive: /dev/scsi/host1/bus0/target0/lun0/disc
Size: 512753664 bytes, 512 MB
Heads: 16 Sectors per Track: 62 Cylinders: 1009

NameFlags Part Type FS Type [Label] Size (MB)
disc1 Primary Linux ext3 [storage] 463.21
disc2 Primary Linux swap / Solaris 49.27

Format the first linux ext3 partition.

~$ mke2fs -j /dev/scsi/host1/bus0/target0/lun0/part1
mke2fs 1.40.11 (17-June-2008)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
113344 inodes, 452320 blocks
22616 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67633152
56 block groups
8192 blocks per group, 8192 fragments per group
2024 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 20 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

And mount it

~$ mkdir -p /mnt/root
~$ mount /dev/discs/disc0/part1 /mnt/root

We may also need some swap just in case the router runs out of memory

~$ mkswap /dev/discs/disc0/part2
~$ swapon /dev/discs/disc0/part2

Copy all fs into new mounted partition.

~$ tar cvO -C / bin/ etc/ root/ lib/ sbin/ usr/ www/ var/ | tar x -C /mnt/root
~$ mkdir -p /mnt/root/tmp && mkdir -p /mnt/root/dev && mkdir -p /mnt/root/proc && mkdir -p /mnt/root/jffs && mkdir -p /mnt/root/mnt/openwrt && mkdir -p /mnt/root/sys

Use the new partition as root partition

Here comes the interesting part. Create a new script in init.d to mount the usb drive at startup.

~$ cat > /etc/init.d/mountusb << EOF
#!/bin/sh /etc/rc.common


start () {
echo "loading USB and ext3 modules"

for module in usbcore usb-ohci uhci ehci-hcd scsi_mod sd_mod usb-storage jbd ext3; do
insmod $module
sleep 2s

[ "$FAILSAFE" != "true" ] && [ -b $EXTERNAL_PARTITION ] && {
mount $EXTERNAL_PARTITION /mnt/root
[ -x /mnt/root/sbin/init ] && {
mount -o move /proc /mnt/root/proc && \
pivot_root /mnt/root /mnt/root/mnt/openwrt && {
mount -o move /mnt/openwrt/dev /dev
mount -o move /mnt/openwrt/tmp /tmp
~$ chmod +x /etc/init.d/mountusb
~$ cd /etc/rc.d/ && ln -s ../init.d/mountusb S06mountusb

This script uses pivot_root to make /mnt/root the new / and will move the current root folder to /mnt/root/mnt/openwrt. The other mount commands will make sure the /proc, /dev & /tmp are updated.

Now reboot your router "et voilĂ "! You're ready to fill all this space with new packages & stuff.


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3.26 Copyright (C) 2008 / Copyright (C) 2007 Alain Georgette / Copyright (C) 2006 Frantisek Hliva. All rights reserved."