Upgrade Oracle Linux 7 to 8 Using Leapp

Wednesday, July 27, 2022 Add a comment

by Ramses Soto-Navarro ramses@sotosystems.com, 7/27/2022

Overview
Pre-install Steps
Run Leapp Pre-upgrade
Verify Version 8 Local Repo
Run Leapp Upgrade
Verify New OS
Remove Old Kernels

Overview

Brief notes on how to run an online upgrade of Oracle Linux 7 to 8 using Leapp. Audience is experienced Linux administrators.

Pre-install Steps

Verify the /boot directory as empty as possible.

Verify that /tmp/ is in the root directory.

Remove NFS software: yum remove nfs-utils

Disable any unecessary mounts: vi /etc/fstab

Add proxy to yum: echo “proxy=http://172.24.80.26:3128” >> /etc/yum.conf

Clear yum lock: yum versionlock clear

Verify at least 20GB of free space on /var/ and /root/.

Disable all services except SSH.

Unregister from ULN.

Disable or remove Ksplice?

Disable any remote authentication, if using.

Verify locality: # cat /etc/locale.conf: LANG=”en_US.UTF-8”

Set locality: ocalectl set-locale LANG=en_US.UTF-8

Record the current OS version:

# cat /etc/os-release | tee ~/old-os-release.txt

Install Leapp and run the pre-upgrade:

# yum install leapp

Alternative install:

# yum install -y leapp --enablerepo=ol7_leapp,ol7_latest

Run Leapp Pre-upgrade

# leapp preupgrade --oraclelinux

To diagnose pre-requesites review the log and answer file:

# less /var/log/leapp/leapp-preupgrade.log
# less /var/log/leapp/answerfile

Example answer fix:

# leapp answer --section remove_pam_pkcs11_module_check.confirm=True

# less /var/log/leapp/leapp-report.txt

Verify Version 8 Local Repo

Verify that all necessary repositories for both version 7 and 8 are defined and enabled.

# cat /etc/yum.repos.d/leapp-upgrade-repos-ol8.repo
[ol8_baseos_latest]
name=Oracle Linux 8 BaseOS Latest ($basearch)
baseurl=https://yum$ociregion.$ocidomain/repo/OracleLinux/OL8/baseos/latest/$basearch/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
gpgcheck=1
enabled=1

# yum repolist

# yum install -y leapp-upgrade --enablerepo=ol7_leapp, ol7_latest

# sudo sed -i '/^enabled=0.*/a proxy=http://172.24.80.26:3128' /etc/yum.repos.d/leapp-upgrade-repos-ol8.repo

Run Leapp Upgrade

# screen

# leapp upgrade --oraclelinux

Verify New OS

It will boot to the OS-Upgrade boot entry, then resume to normal boots thereafter.

Verify that version 8 is now running:

# cat /etc/oracle-release
# uname -r

Verify the new kernel:

# grubby --default-kernel

Enable services.

Enable mounts.

rm -fr /root/tmp_leapp_py3

Enable Ksplice again then reboot; then run it.

Remove Old Kernels

# package-cleanup --oldkernels
# package-cleanup --problems

# grubby --remove-kernel=vmlinuz-5.4.17-2011.6.2.el7uek.x86_64
# grubby --info=ALL | grep kernel

# yum clean all
# sync

==== Links ====

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/upgrading_from_rhel_7_to_rhel_8/index

https://linuxhint.com/upgrade_rhel7_rhel8/

https://docs.oracle.com/en/learn/ol-linux-leapp/index.html

https://docs.oracle.com/cd/F22978_01/8/leapp/F36401.pdf

https://docs.oracle.com/en/operating-systems/oracle-linux/8/leapp/leapp-AboutLeapp.html#upgradingOL7Kvms

The End.

Posted by Ramses at 15:06:22 in

Soto Systems LLC