CentOS Stream 10 – Common Problem 065 – Diagnosis and Fix

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

After kernel upgrade the new kernel is not selectable from the GRUB menu.

Environment & Reproduction

Triggered when /etc/grub2.cfg is not regenerated after kernel installation.

Root Cause Analysis

BLS snippet generation failed or grub2-mkconfig did not run.

Quick Triage

List installed kernels with `dnf list installed kernel` and BLS entries in /boot/loader/entries.

Step-by-Step Diagnosis

Verify BLS configuration is enabled and entries exist.

Solution – Primary Fix

Regenerate with `grub2-mkconfig -o /boot/grub2/grub.cfg` and `grubby –info=ALL`.

Solution – Alternative Approaches

Set default kernel with `grubby –set-default /boot/vmlinuz-…`.

Verification & Acceptance Criteria

GRUB menu lists the new kernel and it becomes the default.

Rollback Plan

Reset default kernel to the previous one if the new entry fails to boot.

Prevention & Hardening

Schedule kernel updates with `dnf-automatic` and validate post-install hooks.

Related Errors & Cross-Refs

Often co-occurs with initramfs rebuild failures and secure-boot issues.

Related tutorial: View the step-by-step tutorial for centos-stream-10.

View all centos-stream-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

CentOS Stream 10 GRUB and BLS reference materials.