📖 ~1 min read
Table of contents
Symptom & Impact
Critical service is terminated unexpectedly causing partial outage.
Environment & Reproduction
Appears during traffic spikes, leaks, or memory overcommit scenarios.
Root Cause Analysis
Kernel OOM killer selects process when memory and reclaim are exhausted.
Quick Triage
Capture OOM logs and memory pressure indicators immediately.
Step-by-Step Diagnosis
Analyze dmesg OOM traces and per-process memory usage patterns.
Solution – Primary Fix
Tune service limits, add memory headroom, and fix leak sources.
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Solution – Alternative Approaches
Apply cgroup isolation and workload shedding during peaks.
Verification & Acceptance Criteria
No OOM terminations under expected and peak traffic profiles.
Rollback Plan
Revert limit changes if they destabilize unrelated workloads.
Prevention & Hardening
Set memory SLO alerts and profile usage continuously.
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Related Errors & Cross-Refs
Related to swap thrashing, latency spikes, and watchdog restarts.
Related tutorial: View the step-by-step tutorial for debian-9.
View all debian-9 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Linux memory management and Debian performance tuning guides.
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