= Upgrading Xen machine from etch to lenny =

This is hairy, so be prepared. Upgrading the domU's to lenny is not a problem and should be done first. When you are ready to upgrade the dom0:

== On each domU ==

 * make sure udev is installed and install the most recent linux xen modules (you should only need the xen modules if you are doing something like decrypting a volume in your domU)
{{{
aptitude install udev linux-modules-2.6.26-2-xen-686
}}}
 * make sure /etc/securetty has xvc0 and hvc0 
{{{
egrep "xvc0|hvc0" /etc/securetty
}}}
 * change tty1 to hvc0 in /etc/inittab
{{{
sed -i 's#1:2345:respawn:/sbin/getty 38400 tty1#1:2345:respawn:/sbin/getty 38400 hvc0#' /etc/inittab
}}}

== On the dom0 ==

 * For each domU config file in /etc/xen/ update kernel and ramdisk lines and add extra line:
{{{
kernel      = '/boot/vmlinuz-2.6.26-2-xen-686'
initrd      = '/boot/initrd.img-2.6.26-2-xen-686'
ramdisk     = '/boot/initrd.img-2.6.26-2-xen-686'
extra       = 'console=hvc0'
}}}
 * edit /boot/grub/menu.lst
{{{
# xenhopt=dom0_mem=268440 com1=115200,8n1 console=com1
# xenkopt=console=hvc0
# kopt=root=/dev/mapper/vg_XXXXXX0-dom0 ro console=ttyS0,115200n8
}}}
 * edit /etc/inittab
{{{
sed -i "s#T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100#T0:23:respawn:/sbin/getty -L hvc0 115200 vt100#" /etc/inittab
}}}
 * perform etch -> lenny upgrade on dom0 - allow debconf to install new versions of /etc/xen-tools/xen-tools.conf and /etc/xen/xend-config.sxp.
 * update two xen files with needed customizations:
  * /etc/xen-tools/xen-tools.conf
{{{
lvm  = vg_gramsci0
dist = lenny
}}}
  * /etc/xen/xend-config.sxp
{{{
# (network-script network-dummy)
(network-script network-bridge)
}}}
 * ensure recent plain kernel is installed:
{{{
aptitude install linux-image-686
}}}
 * ensure xen tools are properly upgraded:
{{{
aptitude install xen-utils-3.2-1 aptitude install xen-linux-system-2.6.26-2-xen-686
}}}
 * reboot
 * if all goes smoothly, purge all old linux/xen packages