Chapter 6. Performing post-upgrade tasks
This procedure lists major tasks recommended to perform after an in-place upgrade to RHEL 8.
Prerequisites
- The system has been upgraded 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.
- The status of the in-place upgrade has been verified 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 remaining RHEL 7 packages.
Locate remaining RHEL 7 packages:
# rpm -qa | grep -e '\.el[67]' | grep -vE '^(gpg-pubkey|libmodulemd|katello-ca-consumer)' | sort
Determine the old kernel version:
# cd /lib/modules && ls -d *.el7*
Remove weak modules from the old 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
Remove the old kernel from the bootloader entry:
# /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
If you upgraded using RHUI on AWS or Microsoft Azure and your software certification is not available on a later minor release version, lock your system to a minor release version supported by your certification.
# echo '8.x' > /etc/yum/vars/releasever- Re-evaluate and re-apply your security policies. Especially, change the SELinux mode to enforcing. For details, see Applying security policies.