CentOS Stream 10 – Common Problem 080 – Diagnosis and Fix

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

systemd-oomd kills workloads under memory pressure on CentOS Stream 10 disrupts services and slows incident response until the root cause is resolved.

Environment & Reproduction

systemd-oomd terminates user.slice services aggressively on memory-tight nodes.

systemctl status systemd-oomd
oomctl

Root Cause Analysis

Misalignment between systemd configuration and CentOS Stream 10 defaults causes the failure path described above.

Quick Triage

Confirm package state, service status, and recent changes before deeper diagnostics.

systemctl status
rpm -qa | grep -i 
journalctl -p err -b --no-pager | tail -100

Step-by-Step Diagnosis

Capture detailed logs, configuration deltas, and runtime state to isolate the failing component.

journalctl -u systemd-oomd -n 200
oomctl --dump
cat /proc/pressure/memory

Solution – Primary Fix

Apply the targeted configuration change and restart the relevant services to restore expected behavior.

sudo systemctl mask systemd-oomd
sudo systemctl restart [email protected]
sudo sysctl vm.swappiness=10

Solution – Alternative Approaches

Tune ManagedOOMSwap/MemoryHigh in unit drop-ins instead of disabling oomd.

Verification & Acceptance Criteria

Validate the fix with deterministic checks and ensure no regressions in dependent services.

oomctl
journalctl -u systemd-oomd -f

Rollback Plan

Revert configuration and restart services to return to the previous known-good state.

systemctl unmask systemd-oomd
systemctl start systemd-oomd

Prevention & Hardening

Right-size memory limits and add swap-on-zram where appropriate.

Related Errors & Cross-Refs

Related: PSI, oomctl, MemoryHigh; see also adjacent topics in the CentOS Stream 10 common problems series.

Related tutorial: View the step-by-step tutorial for centos-stream-10.

View all centos-stream-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

CentOS Stream documentation, Red Hat upstream guides, and CentOS Stream 10 release notes covering this subsystem.