Have to wipe LVM after repeated reinstall

[Christopher Boumenot <boumenot@xxxxxxxxx>]

Greetings,

I have been noticing a problem with anaconda when repeatedly installing 
a server with a disk configuration involving LVM.  Anaconda will fail 
because it cannot create the volume group VolumeGroup00.  After looking 
at the disk, it is clear why - the volume group still exists.  To get 
around this I wrote a simple %pre script that destroys all PGs, VGs, and 
LVs it knows about.  A copy of that script may be found at the bottom of 
this email.  Is this the correct solution, or should Anaconda be 
handling this?  I have verified this behavior on RHEL 4u2, and CentOS 4u4.

---> kickstart.cfg <----
install
text
url --url http://192.168.1.88/centos/4.4-i386
skipx
mouse none
#reboot
authconfig --enablemd5 --enableshadow
lang en_US.UTF-8
langsupport --default en_USs.UTF-8 en_US.UTF-8
keyboard us
firewall --disabled
selinux --disabled
bootloader --location=mbr
timezone --utc US/Eastern
network --device eth0 --bootproto dhcp
clearpart --all --initlabel
partition pv.00 --size 1 --grow
volgroup VolumeGroup00 pv.00
logvol /    --vgname VolumeGroup00 --size 4000  --name=root.fs
logvol swap --vgname VolumeGroup00 --size 2048  --name=swap.fs
logvol /var --vgname VolumeGroup00 --size 8192  --name=var.fs
logvol /usr --vgname VolumeGroup00 --size 4096  --name=usr.fs
logvol /opt --vgname VolumeGroup00 --size 16384 --name=opt.fs

%packages --resolvedeps
@Web Server


# Destroy anything related to LVM
%pre --interpreter /usr/bin/python
import os, re, sys

lvm = "/usr/sbin/lvm.static"

fouth = open("/tmp/lvm_wipe.log", 'w')
print >>fouth, "Starting LVM wipe ..."

if not os.path.exists(lvm):
    print >>fouth, "Error: cannot find %s" % lvm
    sys.exit(1)


for lv in (os.popen("%s lvscan" % lvm).readlines()):
    m = re.match(r".*'([^']+)'", lv)
    if m:
        cmd = "%s lvremove %s" % (lvm, m.group(1))
        print >>fouth, cmd
        print >>fouth, os.popen(cmd).read()

for vg in (os.popen("%s vgscan" % lvm).readlines()):
    m = re.match(r'\s*Found volume group "([^"]+)"', vg)
    if m:
        cmd = "%s vgremove %s" % (lvm, m.group(1))
        print >>fouth, cmd
        print >>fouth, os.popen(cmd).read()


for pv in (os.popen("%s pvscan" % lvm).readlines()):
    m = re.match(r'\s+PV (\S+)', pv)
    if m:
        cmd = "%s pvremove %s" % (lvm, m.group(1))
        print >>fouth, cmd
        print >>fouth, os.popen(cmd).read()

fouth.close()


Thanks,
Christopher