Following setting up a Debian chroot on the Pre, I wanted to be able to ssh into the chroot. This sets that up, including starting Debian's ssh on boot.
Actually, I went a step further and hooked Debian's
rc3.d init scripts into the Pre's webOS boot process,
so all services installed in Debian will start on boot.
So as a bonus, cron, at, etc will also work.
Since the Pre's EVDO IP address changes all the time, dynamic DNS is needed if you want to ssh in over EVDO. I used ez-ipupdate to handle that. (If you didn't want to ssh via EVDO, you could omit that part, and add "-i eth0" to both the firewall rules below.)
novacomand the cable to get a root shell, and
- Install ssh:
apt-get install openssh-server openssh-client
- Hook Debian init scripts into webOS startup:
cat > /media/pre-root/etc/event.d/debian_start <<EOF # start Debian services after webOS boot is complete to avoid delaying that start on stopped finish script echo "Starting Debian services..." chroot /media/debian /etc/init.d/rc 2 end script EOF
/etc/rc.localand add these commands to it:
# Add firewall rule to allow SSH access on port 22, # both wifi and EVDO. iptables -D INPUT -p tcp --dport 22 -j ACCEPT || true iptables -I INPUT -p tcp --dport 22 -j ACCEPT
- If you want to easily be able to determine the phone's address
while it's on wifi, you can use mDNS (hostname.local):
apt-get install avahi-daemon
- Install ez-ipupdate:
- Follow the prompts to configure ez-ipupdate to use dyndns or your preferred dyanmic DNS service. When it asks if ppp is used, say yes.
/etc/ez-ipupdate/default.confand make sure the interface is set to 'ppp0' (See Debian bug #536512 for why you need to do this currently.)
- Hook ez-ipupdate into webOS's ip-up script, so it is run
whenever the address changes:
HOOK=/media/pre-root/etc/ppp/ip-up.d/09ez-ipupdate-debian echo '#!/bin/sh' > $HOOK echo '/usr/sbin/chroot /media/debian /etc/ppp/ip-up.d/ez-ipupdate >/dev/null 2>&1 || true' >> $HOOK chmod a+x $HOOK
- Reboot the Pre. Now is a good time to learn that Orange+Sym+R on the keypad is equivilant to ctrl-alt-del. :-) The ssh daemon should be started automatically.
- Enable avahi for mdns for wifi.
- Cleanly stop Debian services on shutdown. Problem with doing this is that I can't just run '/etc/init.d/rc 0', because that will kill every process in webOS too, and hang the phone. It'd need a very custom runlevel to be set up in Debian.