📖 ~1 min read
Table of contents
Symptom & Impact
Critical services restart during business hours, causing brief outages.
Environment & Reproduction
Occurs when unattended-upgrades runs with default restart behavior.
Root Cause Analysis
Automatic package post-install hooks restart daemons immediately after updates.
Quick Triage
Confirm unattended-upgrades execution window and restarted units.
Step-by-Step Diagnosis
Map package update events to service restart timestamps.
Solution – Primary Fix
Constrain unattended-upgrades and defer restarts to maintenance windows.
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Solution – Alternative Approaches
Disable unattended upgrades and move to orchestrated patch pipelines.
Verification & Acceptance Criteria
No unexpected restarts occur outside approved maintenance windows.
Rollback Plan
Restore previous unattended-upgrades config if patch latency becomes unacceptable.
Prevention & Hardening
Align restart policies with maintenance windows and high-availability design.
Related Errors & Cross-Refs
Related to apt lock contention and package postinst script failures.
Related tutorial: View the step-by-step tutorial for Debian 13.
View all Debian 13 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Debian unattended-upgrades and operational patching guidance.
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