📖 ~1 min read
Table of contents
Symptom & Impact
Critical application service is inactive after reboot, causing downtime and failed upstream health checks.
Environment & Reproduction
Reboot host and run systemctl status ; failure is reproducible when dependency target is missing.
Root Cause Analysis
Incorrect unit dependencies, permission errors, stale PID files, or invalid ExecStart command paths.
Quick Triage
Use systemctl status, systemctl cat, and journalctl -u -b for immediate failure context.
Step-by-Step Diagnosis
Validate unit syntax with systemd-analyze verify, inspect dependent units, and check SELinux AVC denials.
Solution – Primary Fix
Correct unit directives, run systemctl daemon-reload, remove stale runtime files, then systemctl restart and enable service.
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Solution – Alternative Approaches
Use override files in /etc/systemd/system/.d instead of editing vendor unit files directly.
Verification & Acceptance Criteria
Service is active after reboot, no restart loops appear, and dependent targets reach healthy state.
Rollback Plan
Revert unit override changes and restore last known working unit from version control backup.
Prevention & Hardening
Add startup checks to CI/CD, maintain unit files as code, and monitor systemd failed units.
Related Errors & Cross-Refs
Related: Unit entered failed state, Dependency failed, and SELinux denied execute on service binary.
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 systemd and journalctl guides in official RHEL 8 administration documentation.
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