FreeBSD 8.2 -> 9.0 upgrade

gistfile1.sh

# (Systems running 7.[34]-RELEASE, 8.[12]-RELEASE, 9.0-BETA[123], or 9.0-RC[123] can upgrade as follows)
# http://www.freebsd.org/releases/9.0R/installation.html

# upgrade to latest update for current version (required for upgrading to 9.0)
freebsd-update fetch
freebsd-update install

# fetch and install upgrades
freebsd-update -r 9.0-RELEASE upgrade
freebsd-update install

# reboot into new kernel
reboot

# install new system, keep old shared libraries
freebsd-update install

# install pkg_ng, fetch pkg database, migrate to pkg_ng
pkg_add -r ftp://ftp.freebsd.org/pub/FreeBSD/ports/amd64/packages-9-current/Latest/pkg.tbz
cp /usr/local/etc/pkg.conf.sample /usr/local/etc/pkg.conf
rehash
pkg update
pkg2ng

# upgrade installed packages
pkg upgrade -fy

# remove shared libraries
freebsd-update install

# reboot to FreeBSD 9.0
reboot