📖 ~1 min read
Table of contents
Symptom & Impact
Host boots to emergency shell, preventing application service startup and remote orchestration tasks.
Environment & Reproduction
Usually follows fstab edits, missing mount dependencies, or critical service unit failures during boot.
Root Cause Analysis
Boot dependency chain breaks due to invalid mount config, failed fsck, or incorrect default target setting.
Quick Triage
Use emergency console to run `systemctl –failed`, inspect `/etc/fstab`, and read boot logs with journalctl.
Step-by-Step Diagnosis
Validate each failing unit dependency, test mounts manually, and inspect `journalctl -b -p err` output.
Solution – Primary Fix
Repair fstab/unit errors, set correct default target, and reboot to multi-user with healthy services.
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Solution – Alternative Approaches
Temporarily mask failing non-critical service, then perform staged root-cause repair during maintenance window.
Verification & Acceptance Criteria
System reaches multi-user target and all business-critical services become active automatically.
Rollback Plan
Revert recent boot config changes and select known-good kernel/target if issue reappears.
Prevention & Hardening
Validate fstab and unit changes in staging with reboot tests before production rollout.
Related Errors & Cross-Refs
`systemctl get-default && systemctl set-default multi-user.target && journalctl -b -n 150`
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
RHEL 7 boot target and systemd dependency troubleshooting references for recovery operations.
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