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Chapter 8. Performing post-upgrade tasks
The following major tasks are recommended after an in-place upgrade to RHEL 8.
Prerequisites
- You have upgraded the system following the steps described in Performing the upgrade from RHEL 7 to RHEL 8 and you have been able to log in to RHEL 8.
- You have verified the status of the in-place upgrade following the steps described in Verifying the post-upgrade status of the RHEL 8 system.
Procedure
After performing the upgrade, complete the following tasks:
Remove any remaining
Leapp
packages from the exclude list in the/etc/dnf/dnf.conf
configuration file, including thesnactor
package. During the in-place upgrade,Leapp
packages that were installed with theLeapp
utility are automatically added to the exclude list to prevent critical files from being removed or updated. After the in-place upgrade, you must remove theseLeapp
packages from the exclude list before they can be removed from the system.-
To manually remove packages from the exclude list, edit the
/etc/dnf/dnf.conf
configuration file and remove the desiredLeapp
packages from theexclude
list. To remove all packages from the
exclude
list:# yum config-manager --save --setopt exclude=''
-
To manually remove packages from the exclude list, edit the
Remove remaining RHEL 7 packages, including remaining
Leapp
packages.Determine old kernel versions:
# cd /lib/modules && ls -d *.el7*
Remove weak modules from the old kernel. If you have multiple old kernels, repeat the following step for each kernel:
# [ -x /usr/sbin/weak-modules ] && /usr/sbin/weak-modules --remove-kernel <version>
Replace <version> with the kernel version determined in the previous step, for example:
# [ -x /usr/sbin/weak-modules ] && /usr/sbin/weak-modules --remove-kernel 3.10.0-1160.25.1.el7.x86_64
NoteIgnore the following error message, which is generated if the kernel package has been previously removed:
/usr/sbin/weak-modules: line 1081: cd: /lib/modules/<version>/weak-updates: No such file or directory
Remove the old kernel from the boot loader entry. If you have multiple old kernels, repeat this step for each kernel:
# /bin/kernel-install remove <version> /lib/modules/<version>/vmlinuz
Replace version with the kernel version determined in the previous step, for example:
# /bin/kernel-install remove 3.10.0-1160.25.1.el7.x86_64 /lib/modules/3.10.0-1160.25.1.el7.x86_64/vmlinuz
Locate remaining RHEL 7 packages:
# rpm -qa | grep -e '\.el[67]' | grep -vE '^(gpg-pubkey|libmodulemd|katello-ca-consumer)' | sort
Remove remaining RHEL 7 packages, including old kernel packages, and the
kernel-workaround
package from your RHEL 8 system. To ensure that RPM dependencies are maintained, useYUM
orDNF
when performing these actions. Review the transaction before accepting to ensure no packages are unintentionally removed.For example:
# yum remove kernel-workaround $(rpm -qa | grep \.el7 | grep -vE 'gpg-pubkey|libmodulemd|katello-ca-consumer')
Remove remaining
Leapp
dependency packages:# yum remove leapp-deps-el8 leapp-repository-deps-el8
Remove any remaining empty directories:
# rm -r /lib/modules/*el7*
Optional: Remove all remaining upgrade-related data from the system:
# rm -rf /var/log/leapp /root/tmp_leapp_py3 /var/lib/leapp
ImportantRemoving this data might limit Red Hat Support’s ability to investigate and troubleshoot post-upgrade problems.
Disable YUM repositories whose packages cannot be installed or used on RHEL 8. Repositories managed by RHSM are handled automatically. To disable these repositories:
# yum config-manager --set-disabled <repository_id>
Replace <repository_id> with the repository ID.
Replace the old rescue kernel and initial RAM disk with the current kernel and disk:
Remove the existing rescue kernel and initial RAM disk:
# rm /boot/vmlinuz-*rescue* /boot/initramfs-*rescue*
Reinstall the rescue kernel and related initial RAM disk:
# /usr/lib/kernel/install.d/51-dracut-rescue.install add "$(uname -r)" /boot "/boot/vmlinuz-$(uname -r)"
NoteIf your system’s kernel package has a different name, such as on real-time systems, replace
kernel-core
with the correct package name.If your system is on the IBM Z architecture, update the zipl bootloader:
# zipl
- Re-evaluate and re-apply your security policies. Especially, change the SELinux mode to enforcing. For details, see Applying security policies.
Verification
Verify that the old kernels have been removed from the bootloader entry:
# grubby --info=ALL | grep "\.el7" || echo "Old kernels are not present in the bootloader."
Verify that the previously removed rescue kernel and rescue initial RAM disk files have been created for the current kernel:
# ls /boot/vmlinuz-*rescue* /boot/initramfs-*rescue* # lsinitrd /boot/initramfs-*rescue*.img | grep -qm1 "$(uname -r)/kernel/" && echo "OK" || echo "FAIL"
Verify the rescue boot entry refers to the existing rescue files. See the grubby output:
# grubby --info $(ls /boot/vmlinuz-*rescue*)