📖 ~1 min read
Table of contents
Symptom & Impact
Host runs out of space, causing write failures and service disruptions during peak logging periods.
Environment & Reproduction
Occurs on Ubuntu 18.04 when persistent journald storage is enabled without retention caps.
Root Cause Analysis
Continuous high-volume logs accumulate indefinitely, exhausting root or /var partition capacity.
Quick Triage
Quantify log usage quickly and reclaim emergency space to restore critical service availability.
Step-by-Step Diagnosis
Measure journal footprint, identify noisy units, and confirm retention settings in journald configuration.
Solution – Primary Fix
Apply size and age limits, vacuum existing logs safely, and restart journald to enforce new retention.
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Solution – Alternative Approaches
Forward logs centrally, move logs to dedicated volume, or tune service log verbosity.
Verification & Acceptance Criteria
Disk usage stabilizes below threshold and log rotation behavior remains predictable under load.
Rollback Plan
Revert journald retention values if diagnostics retention becomes insufficient for compliance.
Prevention & Hardening
Set baseline retention policy in images and monitor log-growth alerts proactively.
Related Errors & Cross-Refs
Link inode exhaustion and runaway application logs; include matching Ubuntu observability tutorial.
Related tutorial: View the step-by-step tutorial for Ubuntu 18.04 LTS.
View all Ubuntu 18.04 LTS tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Consult journald.conf docs, system logging best practices, and Ubuntu storage maintenance guides.
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