The Depenguinator - Upgrading linux to FreeBSD

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                The Depenguinator - Upgrading linux to FreeBSD
http://www.daemonology.net/blog/2008-01-29-depenguinator-2.0.html
Without further ado, here are the steps I needed to upgrade an
Ubuntu 7.10 system to FreeBSD 7.0-RC1:

Install some bits which the depenguinator needs which aren't included
in the default Ubuntu install.
apt-get install curl
apt-get install bsdtar
apt-get install libc6-dev
apt-get install zlib1g-dev

Download the depenguinator and verify its SHA256 hash.
curl http://www.daemonology.net/depenguinator/depenguin-2.0.tar.gz > depenguin-2.0.tar.gz
sha256sum depenguin-2.0.tar.gz
The computed SHA256 hash should be
aa5d98dd3998545600f5af1d406196832ef8bea59cb022bc3a5efb303ac57cf7.

Extract the depenguination code.
tar -xzf depenguin-2.0.tar.gz
cd depenguin-2.0

Create the depenguinator configuration file.
mv depenguinator.conf.dist depenguinator.conf
nano depenguinator.conf
This configuration file contains basic networking configuration
parameters, so that the system can get back online after it boots
into FreeBSD.

Download the FreeBSD disc1 ISO image and verify its SHA256 hash (change
"7.0" and "7.0-RC1" as appropriate.)
curl ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/ISO-IMAGES/7.0/7.0-RC1-i386-disc1.iso > disc1.iso
sha256sum disc1.iso
Compare the SHA256 hash against the hash contained in the announcement
signed by the FreeBSD release engineer -- we've never found any signs
of Evil People deliberately tampering with release ISO images, but a
few years ago there was a mirror which was corrupting ISO images due
to a faulty network switch.

Create the disk image.  Change "7.0-RC1" to the appropriate release
name, and replace ~/.ssh/authorized_keys by the path to the
SSH public keys you want to be authorized to login as root.
sh -e makeimage.sh disc1.iso 7.0-RC1 ~/.ssh/authorized_keys

Turn off swapping.
swapoff -a

Write the disk image to the partition which used to contain the swap
space (in my case, /dev/sda2).
dd if=disk.img of=/dev/sda2

Add FreeBSD to GRUB's list of operating systems, and set it as the
default system to boot into.  In my case, this meant adding
title   FreeBSD
root    (hd0,1)
makeactive
chainloader +1
to /boot/grub/menu.lst and changing the default line
to default 3.

Reboot into FreeBSD.
shutdown -r now

After waiting for the system to reboot, SSH back in; FreeBSD is now
running in a memory disk; so now you can slice, partition, and create
file systems on the hard drive(s) and install FreeBSD however you wish.
If you find this useful, please consider
donating to the
FreeBSD Foundation and sending
me an email to let me know that you have done so -- it's remarkably
gratifying to see such a concrete demonstration that people appreciate
what I've done.
Now go forth and depenguinate!
               
               
               
               
               

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