On Wed, Feb 20, 2013 at 07:57:22AM -0600, Pat Riehecky wrote:
> On 02/19/2013 10:14 AM, Graham Allan wrote:
> >On Mon, Feb 18, 2013 at 07:33:37PM -0700, Orion Poplawski wrote:
> >>On 02/18/2013 02:01 PM, Ken Teh wrote:
> >>>During a kickstart install, how are drives mapped? I notice that sata0
> >>>is not always sda. This is especially true when there are very large
> >>>drives in the mix.
> >>The sd* letters are simply handed out in order of enumeration and,
> >>as you noted, is not deterministic. If you need that, use the
> >>/dev/disk/by-{id,label,path,uuid} labels.
> >For this reason we use a script during the kickstart %pre section which
> >attempts to examine the available drives and determine which is the
> >appropriate one to install on (also waits for confirmation if an
> >unexpected partition table is found).
> >
> >G.
>
> Any chance you can share that script? It sounds interesting!
Well I hope I haven't oversold this - it's not a miracle cure but it
works for our environment.
Back in the SL3/4/5 days we made some basic assumptions in kickstart
%pre that if there was an hda device, that would be the OS drive,
otherwise use sda. If a workstation didn't match that model, we'd
generally beat on it until it did :-) IIRC SL6 changed so that ATA drives,
and any connected usb drives, appeared as sd* devices, and you couldn't be
certain about the ordering.
There will be lots of deeply unfashionable things in this script such as
using regular drive partitions instead of LVM, using separate /var,
etc... Also please remember it's been hacked together as edge cases were
discovered so it's not pretty, or commented as well as it might be.
It tries to examine all candidate drives (after eliminating USB devices)
and will select a drive for installation if it either contains no
partition table, or finds a /boot directory (actually that hardly seems
foolproof, there might be better choices). Otherwise if it finds an
unfamiliar partition table, it prints it and asks for confirmation.
The rest of the script is concerned with stashing away ssh keys and
suchlike, for restoration after a reinstall.
Here goes, hope vim didn't mangle it overmuch during pasting, and don't
judge it too harshly!
%pre
##################
# Figure out where to install to
#Make sure USB storage devices are GONE
modprobe -r usb_storage
mkdir /mnt/tmp
for i in `ls /dev/sd?`; do
CANDIDATE_DISK="$i"
echo "UMPHYS: Checking $CANDIDATE_DISK for partition table" | tee -a /tmp/ks.log >> /dev/tty3
if parted -s "$CANDIDATE_DISK" print >/dev/null; then
echo "parted found a partition table" | tee -a /tmp/ks.log >> /dev/tty3
if mount "${CANDIDATE_DISK}1" /mnt/tmp; then
if [ -d /mnt/tmp/boot ]; then
INSTALL_DISK=$CANDIDATE_DISK
echo "Found /boot on ${CANDIDATE_DISK}1, using $CANDIDATE_DISK as system disk" | tee -a /tmp/ks.log >> /dev/tty3
umount /mnt/tmp
break
else
echo "Couldn't find /boot on ${CANDIDATE_DISK}1, moving on to next disk..." | tee -a /tmp/ks.log >> /dev/tty3
umount /mnt/tmp
fi
umount /mnt/tmp
fi
else
echo "Failed to mount ${CANDIDATE_DISK}1, moving on to next disk..." | tee -a /tmp/ks.log >> /dev/tty3
fi
else
echo "parted found no partition table, using $CANDIDATE_DISK as system disk" | tee -a /tmp/ks.log >> /dev/tty3
INSTALL_DISK="$CANDIDATE_DISK"
break
fi
done
if [ "${INSTALL_DISK}x" = "x" ]; then
echo "****************************************************" >> /dev/tty1
echo "Initial check failed to find a suitable system disk!" >> /dev/tty1
echo "****************************************************" >> /dev/tty1
for i in `ls /dev/sd?`; do
CANDIDATE_DISK="$i"
if mount "${CANDIDATE_DISK}1" /mnt/tmp; then
if ! [ -d /mnt/tmp/boot ]; then
echo -e "\n\nCouldn't find /boot on ${CANDIDATE_DISK}1" >> /dev/tty1
echo -n "Partition table for ${CANDIDATE_DISK}:" >> /dev/tty1
fdisk -l ${CANDIDATE_DISK} >> /dev/tty1
doit="default"
while ! echo "$doit" | grep -P "([Y|y]es|[N|n]o)" > /dev/null 2>&1; do
echo -n "Install linux on ${CANDIDATE_DISK}? [Yes/No] " >> /dev/tty1
read doit
done
if echo "$doit" | grep -P "[Y|y]es" > /dev/null 2>&1; then
INSTALL_DISK="$CANDIDATE_DISK"
umount /mnt/tmp
break
else
echo "moving on to next disk..." >> /dev/tty1
fi
umount /mnt/tmp
fi
else
echo -ne "\n\nPartition table for ${CANDIDATE_DISK}:" >> /dev/tty1
fdisk -l ${CANDIDATE_DISK} >> /dev/tty1
doit="default"
while ! echo "$doit" | grep -P "([Y|y]es|[N|n]o)" > /dev/null 2>&1; do
echo -n "Install linux on ${CANDIDATE_DISK}? [Yes/No] " >> /dev/tty1
read doit
done
if echo "$doit" | grep -P "[Y|y]es" > /dev/null 2>&1; then
INSTALL_DISK="$CANDIDATE_DISK"
break
else
echo "moving on to next disk..." >> /dev/tty1
fi
fi
done
if [ "${INSTALL_DISK}x" = "x" ]; then
echo -e "\n****************************************************" >> /dev/tty1
echo "Failed to find a suitable system disk" >> /dev/tty1
echo "The system will be rebooted when you press Ctrl-C or Ctrl-Alt-Delete." >> /dev/tty1
echo "****************************************************" >> /dev/tty1
while true; do
sleep 1
done
fi
fi
echo "Installing linux to $INSTALL_DISK" | tee -a /tmp/ks.log >> /dev/tty3
echo "Installing linux to $INSTALL_DISK" >> /dev/tty1
echo "****************************************************" >> /dev/tty1
# Done figuring out where to install
###################
#Write a file out to be included below for disk config
cat << EOF > /tmp/partitions
clearpart --drives=$INSTALL_DISK --initlabel --all
zerombr yes
part swap --recommended --ondisk=$INSTALL_DISK
part / --size=25600 --ondisk=$INSTALL_DISK
part /var --size=4096 --ondisk=$INSTALL_DISK
part /export/scratch --size=128 --grow --ondisk=$INSTALL_DISK
EOF
# Salvage files from an old installation if possible
mkdir /tmp/physkeys
echo "Attempting to salvage files..." | tee -a /tmp/ks.log >> /dev/tty3
for i in `fdisk -l $INSTALL_DISK | grep ^/dev | grep -v '\(swap\|lvm\|extended\)' | cut -b 1-9`; do
echo "Mounting $i (label '`e2label $i`') to /mnt/tmp" | tee -a /tmp/ks.log >> /dev/tty3
mount $i /mnt/tmp
# SSH keys
if [ -d /mnt/tmp/etc/ssh ]; then
echo "Found ssh keys. Stashing"| tee -a /tmp/ks.log >> /dev/tty3
mkdir /tmp/physkeys/ssh
cp -p /mnt/tmp/etc/ssh/ssh_host_* /tmp/physkeys/ssh
fi
# X config
if [ -f /mnt/tmp/etc/X11/xorg.conf ]; then
echo "Found xorg.conf. Stashing"| tee -a /tmp/ks.log >> /dev/tty3
mkdir /tmp/physkeys/X11
cp -p /mnt/tmp/etc/X11/xorg.conf /tmp/physkeys/X11
fi
# Cfengine keys (sep /var partition)
if [ -d /mnt/tmp/cfengine/ppkeys ]; then
echo "Found cfengine ppkeys. Stashing"| tee -a /tmp/ks.log >> /dev/tty3
mkdir /tmp/physkeys/cfengine
cp -p /mnt/tmp/cfengine/ppkeys/* /tmp/physkeys/cfengine #*/
fi
# Cfengine keys (integrated /var)
if [ -d /mnt/tmp/var/cfengine/ppkeys ]; then
echo "Found cfengine ppkeys. Stashing"| tee -a /tmp/ks.log >> /dev/tty3
mkdir /tmp/physkeys/cfengine
cp -p /mnt/tmp/var/cfengine/ppkeys/* /tmp/physkeys/cfengine #*/
fi
# Crontabs
if [ -d /mnt/tmp/spool/cron ]; then
echo "Found cron. Stashing"| tee -a /tmp/ks.log >> /dev/tty3
mkdir /tmp/physkeys/cron
cp -p /mnt/tmp/spool/cron/* /tmp/physkeys/cron #*/
fi
umount /mnt/tmp
done
%end
--
-------------------------------------------------------------------------
Graham Allan
School of Physics and Astronomy - University of Minnesota
-------------------------------------------------------------------------
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