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Pre-requisites.
- Verify the running kernel version:
uname -sr
Example output: Linux 4.18.0-513.11.1.el8_9.x86_64.
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List installed kernel packages:
rpm -q kernel
Example output:
kernel-4.18.0-513.9.1.el8_9.x86_64
kernel-4.18.0-513.11.1.el8_9.x86_64
kernel-4.18.0-513.24.1.el8_9.x86_64
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Take a snapshot of the VM before proceeding with the cleanup steps. It is a must.
Cleanup Steps.
Remove older kernel versions.
Use the following command to remove older kernels, keeping only the latest two:
yum remove $(yum repoquery --installonly --latest-limit=-2 -q)
Important Note:
Before confirming the removal, verify that the output includes all three components of the same kernel version:
- Kernel.
- Kernel-core.
- Kernel-modules.
Example output:
Removing:
kernel x86_64 4.18.0-513.9.1.el8_9 @baseos
kernel-core x86_64 4.18.0-513.9.1.el8_9 @baseos
kernel-modules x86_64 4.18.0-513.9.1.el8_9 @baseos
If the versions match and are not the currently running kernel, press y to confirm.
Post-Cleanup Verification.
- Recheck installed kernels:
rpm -q kernel
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Ensure the current kernel is still installed:
uname -r
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Reboot to verify system stability:
reboot
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