RedHat 8.9 back to 8.8
Can I roll back the kernel from 8.1 back to the one that was shipped in 8.0? Should I?
Yes you can... should you is a different story.
yum downgrade kernel
Should do it.
More on reddit.comSo an app team in my org needs their recently updated to 8.9 systems, permanently rolled back to 8.8. What's the best way to perform this rollback so the systems is back on 8.8 every time it boots, etc.?
Ouch. The update to 8.1 broke a third-party kernel module that had been running fine in 8.0, but apparently is incompatible with the 4.18.0-147.3.1.el8_1.x86_64 kernel. The developer distributes the kernel module via an .rpm that installs to DKMS.
Is it possible in 8.1 to roll back to the kernel from 8.0? Is that advisable?
Red Hat Enterprise Linux 6.4 is just Red Hat Enterprise Linux 6.0 with all updates rolled into it. "Downgrading" would mean going to 5.x. If something isn't "certified" for RHEL 6.4 it's just lagging behind, or perhaps it is incompatible with a specific update (if so, I'd be rather suspicious of a package that breaks with Red Hat's very conservative package update policy).
RedHat says the correct solution is to install the appropriate kernel version, then downgrade to the previous minor release:
How to downgrade kernel and redhat-release to a previous minor version of Red Hat Enterprise Linux
https://access.redhat.com/solutions/186763
# yum list kernel-2.6.32-358*
...
kernel.x86_64 2.6.32-358.23.2.el6 rhel-6.2-server-for-rhs-2.0-rpms
# yum install kernel-2.6.32-358.23.2.el6
# Reboot
# yum downgrade redhat-release
Confirm the downgrade:
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.4 (Santiago)
Actually, downgrade wouldn't work for kernel. The right command would be localinstall:
#yum localinstall ./kernel....rpm
If you have more then 5 kernels yum will delete oldest.
rpm -ivh <kernel.rpm> --oldpackage
does the job in centos
This will install your kernel, now make sure the grub entries are proper and then you can reboot and boot into this kernal