📖 ~1 min read
Table of contents
Symptom & Impact
Root filesystem fills gradually, impacting package installs and service reliability under storage pressure.
Environment & Reproduction
Persistent journals with high log volume and no retention policy commonly trigger this in Buster.
Root Cause Analysis
Default journal retention may exceed available disk budget when noisy services generate sustained events.
Quick Triage
Run journalctl –disk-usage and identify top noisy units before deleting useful operational history.
Step-by-Step Diagnosis
Review journald.conf settings, event rates, and storage growth trend across incident periods.
Solution – Primary Fix
Set SystemMaxUse and RuntimeMaxUse, vacuum old entries, and reduce excessive application log verbosity.
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Solution – Alternative Approaches
Forward journals to central logging and keep minimal local retention on constrained nodes.
Verification & Acceptance Criteria
Disk usage remains within budget and journal growth no longer causes operational alerts.
Rollback Plan
Restore previous journald retention values if shortened history blocks audit requirements.
Prevention & Hardening
Apply log budget thresholds and automated checks for abnormal event spikes per service.
Related Errors & Cross-Refs
No space left on device, failed writes to /var/log/journal, and journal rotation pressure.
Related tutorial: View the step-by-step tutorial for Debian 10.
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Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
systemd-journald and journald.conf documentation for Debian 10 capacity planning.
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