Scripts and packaging needed to create an LRP that can upgrade a legacy CentOS 6.5 system to CentOS 7.2
cd into the scripts directory and run the following scripts:
./makeNmUsbUpgrade.sh <version> <NMCentOSUpgrade-directory> <kickstart-build-directory> [buildRPMS-num]./makePreCheckLrp.sh <version>./makeUpgradeLrp.sh <version> <iso-usb-directory>
for example:
./makeNmUsbUpgrade.sh 3.2.1.108 /home/jgress/wk /home/jgress/kickstart 71
./makePreCheckLrp.sh 3.2.1.108
./makeUpgradeLrp.sh 3.2.1.108 /home/jgress/kickstart
It is possible to boot an iso image from a physical partition using grub2. To upgrade NetMon with CentOS 6.5 to NetMon with CentOS 7.2 using an lrp, the following is necessary:
- Install and configure grub2 on the CentOS 6.5 system.
- Delete the existing physical volume on the sda2 partition which contains the root, home, and swap logical volumes.
- Recreate a new sda partitioning to add a third partition large enough to hold the iso image.
- Create an ext2 file system on the new sda3 partition, and copy the iso image into that partition
- Modify the initramfs-2.6.32-573.7.1.el6.x86_64.img to perform the repartitioning. The "init" script in the initramfs is modified to do the following:
- Repartition the sda drive as described above.
- Copy the iso image into the sda3 partition.
- Reboot the system and run the iso image.
- The iso image must be properly prepared to recreate the root, home, and swap partitions while reusing the existing /usr/local and pcap partitions. The iso image must also be able to move the metadata and configuration in /usr/local to a saved location during the install and then recover the saved data so it is available when the upgraded system starts up.
- Upgrade iso.usb file
- Modified initrd-nuclear.img file
- grub custom menu options file
- grub2 rpm file
- script to check system for suitability to perform the upgrade successfully
- script to install and configure grub2
- script to copy iso and initrd files to proper locations
- script to save metadata and configuration
- script to configure grub to reboot with option 2 and reboot the system.
- System is running 2.6.32-573.7.1.el6.x86_64 linux kernel.
- System has /boot partition on /dev/sda1 partition.
- System has /dev/sda1 partition starting at sector 2048 and size 1024000.
- System has /dev/sda2 partition starting at sector 1026048 and size 583817216.
- System has vg_probe00 volume group allocated on /dev/sda2 partition.
- System has vg_probe01 volume group allocated on /dev/sdb1 partition.
- System has lv_data logical volume on vg_probe01 volume group.
- System has lv_pcapX logical volume on vg_probe01 volume group, where X is blank, 0, 1, or 2.
- /dev/mapper/vg_probe01-lv_data is mounted on /usr/local mount point.
- Removable disk media (USB drives) are not connected to the system.
- Start with the /boot/initramfs-2.6.32-573.7.1.el6.x86_64.img
- unpack the initramfs from the /boot directory. For example:
mkdir initrdcd initrdgunzip -c /boot/initramfs-2.6.32-573.7.1.el6.x86_64.img | cpio -i –make-directories
- Add sdaDiskPart to initrd:
# partition table of /dev/sda
unit: sectors
/dev/sda1 : start= 2048, size= 1024000, Id=83, bootable
/dev/sda2 : start= 1026048, size=114483200, Id=8e
/dev/sda3 : start=115509248, size= 10240000, Id=83
/dev/sda4 : start= 0, size= 0, Id= 0
- Add the following to the init script just after the
rdbreak=initqueue:
[ -x /bin/plymouth ] && /bin/plymouth --hide-splash
echo
echo
echo Nuclear Option - reformat sda drive
sleep 5
sda2CheckCnt=0
echo Wait for sda2 drive
while [ ! -e /dev/sda2 ] && [ $sda2CheckCnt -le 60 ]; do
sda2CheckCnt=$((sda2CheckCnt+1))
echo $sda2CheckCnt Waiting for sda2
sleep 1
done
if [ ! -e /dev/sda2 ]; then
echo
echo
echo Break to shell. sda2 not found.
echo Upgrade can not be applied.
echo type \"exit\" to reboot.
echo
/bin/sh
# Reboot the system
echo b > /proc/sysrq-trigger
fi
# Delete any remnants of the root physical volume with its volume group and logical volumes.
echo Delete the root physical volume
echo
echo
/sbin/lvm pvremove -ff -y /dev/sda2
/bin/dd if=/dev/zero of=/dev/sda2 count=1k bs=16k
sleep 1
# Format the sda drive with new partitions
/sbin/sfdisk --force /dev/sda < /sdaDiskPart
sleep 1
# reload the new disk partitioning into the kernel
/sbin/hdparm -z /dev/sda
sleep 1
/sbin/mkfs.ext2 /dev/sda3
echo sda drive reformated
echo
echo
ls -lh /dev/sda*
echo
echo
sleep 2
- Add the following to the init script just after the
source_all pre-mount:
echo
echo
echo Copy iso image to new sda3 partition ...
mkdir /usrlocal
mount /dev/mapper/vg_probe01-lv_data /usrlocal
mkdir /lrup
mount /dev/sda3 /lrup
cp /usrlocal/iso/nm_install* /lrup/
echo iso image copied to sda3 partition
echo Waiting for unmount of lrup partition.
until umount /lrup
do
echo Waiting for unmount of lrup partition.
sleep 1
done
echo
echo
echo Backup configuration data to be restored after the upgrade.
mkdir -p /usrlocal/save
mv /usrlocal/probe/conf /usrlocal/save/
mv /usrlocal/probe/userLua /usrlocal/save/
mkdir -p /usrlocal/save/apiLua
mv /usrlocal/probe/apiLua/usr /usrlocal/save/apiLua
mkdir -p /usrlocal/save/elasticsearch
mv /usrlocal/probe/db/elasticsearch/data /usrlocal/save/elasticsearch/
# Remove all remaining remnants of CentOS 6.5 Network Monitor before upgrading
rm -rf /usrlocal/probe/
rm -rf /usrlocal/www/
rm -rf /usrlocal/kibana*
echo Waiting for unmount of usrlocal partition.
until umount /usrlocal
do
echo Waiting for unmount of usrlocal partition.
sleep 1
done
# The third grub boot menu option is to install from the iso file in sda3
echo
echo Change grub to boot the third menu option on next boot
mkdir /boot
mount /dev/sda1 /boot
sed -i -e "s/next_entry=.*$/next_entry=3/g" /boot/grub/grubenv
echo Waiting for unmount of boot partition
until umount /boot
do
echo Waiting for unmount of boot partition
sleep 1
done
sleep 2
# Reboot the system
echo b > /proc/sysrq-trigger
cp /sbin/sfdisk sbin/cp /sbin/mkfs.ext2 sbin/cp -a /lib64/libext2fs.so.2* lib64/cp -a /lib64/libcom_err.so.2* lib64/cp -a /lib64/libe2p.so.2* lib64/yum install hdparm-9.43-4.el6.x86_64cp /sbin/hdparm sbin/
- From the initrd directory:
find ./ | cpio -H newc -o >/tmp/initrd-cpiogzip -c /tmp/initrd.cpio > /boot/initrd-nuclear.img
During the reformatting of the sda drive in the initrd; configuration and metadata in /usr/local/probe partition is moved to a a save directory outside /usr/local/probe. The /usr/local/probe directory is deleted to ensure a clean install is completed with a new /usr/local/probe directory.
Also /usr/local/www and /usr/local/kibana* are removed; again to ensure a clean install of those components.
- Move /usr/local/probe/db/elasticsearch/data to /usr/local/save/data
- Move /usr/local/probe/conf/* files to /usr/local/save/conf
- Move /usr/local/probe/userLua/* files to /usr/local/save/userLua
- Move /usr/local/probe/apiLua/usr/* files to /usr/local/save/apiLua/usr
- chown files that need new ownership
chown -R elasticsearch:dpi /usr/local/probe/db/elasticsearch/datachown -R dpi:dpi /pcap0
- Restore nm.yaml settings saved in /usr/local/save/conf/nm.yaml
- Can the entire nm.yaml file be restored?
- pcapInterface may need to be updated to modify ethX or other non bond0 setting.
- Restore apiLua/usr/* files to /usr/local/probe/apiLua/usr