📖 ~1 min read
Table of contents
Symptom & Impact
System boots into unexpected kernel or fails to present expected boot option after maintenance.
Environment & Reproduction
Following automated cleanup on RHEL 8, grub2 menu lacks latest or required kernel entry.
Root Cause Analysis
Aggressive prune logic removed required packages or grub2 config was not regenerated correctly.
Quick Triage
Check rpm -qa kernel* list, grub2-editenv output, and journalctl around cleanup execution time.
Step-by-Step Diagnosis
Compare installed kernels against /boot loader entries and validate grub2 config target path for platform.
Solution – Primary Fix
Reinstall needed kernel package with dnf, regenerate grub2 config, and set default entry explicitly.
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Solution – Alternative Approaches
Keep multiple known-good kernels and adjust cleanup retention policy in automation scripts.
Verification & Acceptance Criteria
Correct kernel appears in grub menu, selected default persists, and reboot completes successfully.
Rollback Plan
Boot previous kernel manually from grub and revert recent cleanup script or package state changes.
Prevention & Hardening
Implement guarded kernel retention, post-update boot validation, and approval gates for cleanup jobs.
Related Errors & Cross-Refs
Closely related to failed initramfs generation and package transaction interruptions during updates.
Related tutorial: View the step-by-step tutorial for rhel-8.
View all rhel-8 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Consult RHEL 8 bootloader, kernel lifecycle, and dnf history documentation from Red Hat.
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