📖 ~1 min read
Table of contents
Symptom & Impact
Server stops in emergency shell after reboot and production services do not come online.
Environment & Reproduction
Following yum kernel updates on RHEL 7, reboot triggers failed mount units tied to invalid UUID entries.
Root Cause Analysis
fstab references stale identifiers or missing volumes, blocking normal boot target progression.
Quick Triage
From console, run journalctl -xb and systemctl –failed to identify first failing mount or dependency.
Step-by-Step Diagnosis
Compare blkid output with fstab UUIDs, verify LVM activation, and check dracut/initramfs consistency.
Solution – Primary Fix
Correct fstab entries, use nofail where appropriate, rebuild initramfs if needed, then reboot to multi-user target.
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Solution – Alternative Approaches
Boot previous kernel from GRUB as temporary workaround while validating storage mapping changes.
Verification & Acceptance Criteria
System reaches normal target, mounts are active, and application services recover without manual intervention.
Rollback Plan
Restore previous fstab and kernel selection, then schedule controlled remediation window.
Prevention & Hardening
Run pre-reboot fstab validation and maintain documented disk UUID inventory for each host.
Related Errors & Cross-Refs
Related to NFS boot mount timing and systemctl dependency failed job messages.
Related tutorial: View the step-by-step tutorial for rhel-7.
View all rhel-7 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Use RHEL emergency mode and dracut troubleshooting guides for safe recovery procedures.
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