π ~1 min read
Table of contents
Symptom & Impact
Critical processes are terminated by OOM killer, causing application outages and data loss risk.
Environment & Reproduction
More frequent on memory-constrained VMs with swap disabled.
free -h && swapon --showRoot Cause Analysis
Insufficient virtual memory headroom combined with workload spikes exhausts available RAM.
Quick Triage
Confirm recent OOM events and identify victim processes.
dmesg -T | grep -i 'out of memory'Step-by-Step Diagnosis
Inspect memory pressure metrics and per-process usage trends.
vmstat 1 5 && ps aux --sort=-%mem | head
Solution – Primary Fix
Add properly sized swapfile and tune swappiness for workload profile.
Still having issues? Our Managed IT Services team can diagnose and resolve this for you. Get in touch for a free consultation.
sudo fallocate -l 4G /swapfile && sudo chmod 600 /swapfile && sudo mkswap /swapfile && sudo swapon /swapfile
Solution – Alternative Approaches
Scale memory resources or enforce cgroup limits to prevent host-wide pressure spikes.
Verification & Acceptance Criteria
No new OOM kills under expected load and swap activity remains within acceptable bounds.
Rollback Plan
Disable and remove swapfile if policy disallows swap on specific storage tiers.
Prevention & Hardening
Set memory alerts, right-size services, and tune allocator limits for peak scenarios.
Related Errors & Cross-Refs
Related to kernel panic on low-memory systems and abrupt service restarts.
Related tutorial: View the step-by-step tutorial for Ubuntu 26.04 LTS.
View all Ubuntu 26.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Ubuntu memory management and swap tuning documentation.
Need Expert Help?
If you cannot resolve this yourself, our team offers hands-on Server Management, Managed IT Services, and flexible Support Plans. Contact us today β we respond within one business day.
