📖 ~1 min read
Table of contents
Symptom & Impact
Critical daemon repeatedly restarts and remains unavailable, affecting dependent applications.
Environment & Reproduction
Typically appears after package relocation, custom scripts, or unit overrides.
Root Cause Analysis
ExecStart references a binary path that no longer exists or is not executable by the service user.
Quick Triage
Inspect unit and override files to verify final merged command path.
Step-by-Step Diagnosis
Validate target executable permissions, shebang, and SELinux/AppArmor context where applicable.
Solution – Primary Fix
Correct ExecStart path, reload systemd metadata, and restart service.
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Solution – Alternative Approaches
Use stable symlink targets or wrapper scripts with version-agnostic paths.
Verification & Acceptance Criteria
Service remains active without restart storms and passes health checks.
Rollback Plan
Restore previous unit file from backup and restart old binary release.
Prevention & Hardening
Enforce unit validation in deployment pipelines with service smoke tests.
Related Errors & Cross-Refs
Related to 203/EXEC exit code, permission denied, and working directory issues.
Related tutorial: View the step-by-step tutorial for Debian 13.
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Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
systemd.unit and systemd.service manuals.
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