FreeBSD 12 – /etc/fstab Entry Errors Trigger Single-User Boot – Corrective Procedure

📖 ~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

System enters single-user mode because one or more filesystems fail to mount at boot.

Environment & Reproduction

Common after disk changes, GPT relabeling, or manual fstab edits.

cat /etc/fstab
glabel status

Root Cause Analysis

Mount identifiers or options in fstab do not match current disk layout.

Quick Triage

Validate each mount target and test manual mounts.

mount -a
ls /dev/gpt

Step-by-Step Diagnosis

Compare fstab entries with actual labels and filesystems.

gpart show
zfs list
cat /etc/fstab

Solution – Primary Fix

Correct mount identifiers and options, then retry mount sequence.

cp /etc/fstab /etc/fstab.bak.$(date +%F)
vi /etc/fstab
mount -a

Solution – Alternative Approaches

Use GPT labels consistently to avoid device-node renumbering issues.

Verification & Acceptance Criteria

All required filesystems mount and system boots to normal multi-user state.

mount | head -n 40

Rollback Plan

Restore backed-up fstab if corrected layout still fails under production workload.

Prevention & Hardening

Require peer review for fstab edits and pre-reboot mount validation checklist.

Related Errors & Cross-Refs

mount: /path: No such file or directory, filesystem check failed at boot.

Related tutorial: View the step-by-step tutorial for freebsd-12.

View all freebsd-12 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

fstab(5), mount(8), and FreeBSD storage administration docs.