[EXTERNAL] Reinstall and keep data LV

[Aaron Morrison]

We use pre/post script to backup / restore certain data on LVM and SW 
Raid systems...

Obviously, you'll need to modify which LVM names to mount, etc, but this 
should get you started....

#!/bin/bash
mkdir -p /mnt/oldroot
## mdadm scan for raid to save drive
mkdir -p /etc/mdadm
mdadm --examine --scan >>/etc/mdadm/mdadm.conf
mdadm --assemble --scan
#
# Look for old LVM root
# In RHEL6, we deprecate mounting non-lvm file systems
#
mounted=""
lvm=""
# Check for lvm disk existence
if lvm lvmdiskscan -l 2>1 /dev/null|grep -q '[1-9] LVM physical'; then
    # root volume group scan
    VGNAME=$(lvm vgdisplay -C --noheadings|grep -i root|awk '{print $1}')
    # enable rootvg
    lvm vgchange -a y \$VGNAME
    # root and var logvols we care about
    LVROOT=$(lvm lvdisplay -C --noheadings $VGNAME|grep -i volroot|awk 
'{print $1}')
    LVVAR=$(lvm lvdisplay -C --noheadings $VGNAME|grep -i volvar|awk 
'NR==1{print $1}')
    mount /dev/$VGNAME/$LVROOT /mnt/oldroot
    mount /dev/$VGNAME/$LVVAR /mnt/oldroot/var
    mounted="true"
    lvm="true"
    (cd /mnt/oldroot; tar cvpf /tmp/oldfiles.tar etc/krb5.keytab 
etc/ssh/ssh_host_* etc/exports var/spool/cron/ var/cfengine/ppkeys/ )
    if [ -n $mounted ] ; then
       cd /;
       umount /mnt/oldroot/var
       umount /mnt/oldroot
    fi
    if [ -n $lvm ]; then
       lvm vgchange -a n $VGNAME
    fi
else
    echo "Warning! Unable to mount old filesystem for backup/restore for 
system files..."
fi
##stop sw raid if any
mdadm --stop --scan


Markus Falb wrote:
> Hi,
> I am struggling!
> I want to reinstall LVM based installs. I want to keep some LVs (data)
> but want to overwrite the other LVs(system)
>
> First I did a kickstart of RHEL 7, here the storage related lines
>
> ...snip
> zerombr
> clearpart --all --initlabel
> part pv.0 --fstype=lvmpv --grow --asprimary
> part /boot --fstype=xfs --size 1000 --asprimary --label BOOT
> volgroup rhel_rhellv01 pv.0
> logvol / --vgname=rhel_rhellv01 --name=root --size 5000 --fstype=xfs
> logvol /home --vgname=rhel_rhellv01 --name=home --fstype=xfs --size \
>    1000 --fsoptions="defaults,nodev,nosuid,noexec"
> logvol swap --fstype="swap" --name=swap --vgname=rhel_rhellv01 --size 1000
> snap...
>
> Next I tried a reinstall with a modified kickstart
>
> ...snip
> bootloader --location=mbr --append="rhgb quiet crashkernel=auto"
> part /boot --fstype=xfs --size 1000 --asprimary --label BOOT \
>    --onpart=/dev/disk/by-id/ata-QEMU_HARDDISK_QM00003-part1
> part pv.0 --fstype=lvmpv --grow --asprimary \
>    --onpart=/dev/disk/by-id/ata-QEMU_HARDDISK_QM00003-part2 --noformat
> volgroup rhel_rhellv01 --noformat
> logvol / --vgname=rhel_rhellv01 --name=root --size 5000 --fstype=xfs \
>    --useexisting
> logvol /home --vgname=rhel_rhellv01 --name=home --fstype=xfs --size \
>    1000 --fsoptions="defaults,nodev,nosuid,noexec" --noformat
> logvol swap --fstype="swap" --name=swap --vgname=rhel_rhellv01 --size \
>    1000 --useexisting
> snap...
>
> this is working with RHEL 7 (so my kickstart is not totally wrong)!
>
> but with RHEL 8
>
> error: logical volume "root" given in logvol command does not exist
>
> What is wrong with my kickstart? What should I change that it works
> with RHEL 8 too?
>
> Best Regards, Markus
>
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