Yum Update Fails Due to Insufficient /var Cache Space

📖 ~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

Yum aborts mid-transaction with write errors, delaying security patching and compliance deadlines.

Environment & Reproduction

Occurs when `/var` is undersized for large update sets, kernel packages, or retained caches.

Root Cause Analysis

Temporary RPM payload storage in `/var/cache/yum` exceeds available space during transaction staging.

Quick Triage

Check `/var` utilization, run `yum clean all`, and confirm systemctl service health after freeing space.

Step-by-Step Diagnosis

Measure package download footprint, inspect old kernels and logs, and review journalctl ENOSPC events.

Solution – Primary Fix

Clear cache, remove obsolete kernels safely, extend `/var` if needed, and rerun yum transaction.

Solution – Alternative Approaches

Use local mirror and staged updates to reduce per-run cache pressure on constrained hosts.

Verification & Acceptance Criteria

`yum update` completes fully and post-update reboot/services behave normally without disk alerts.

Rollback Plan

If package state is partial, use yum history rollback and restore pre-maintenance snapshot.

Prevention & Hardening

Enforce minimum `/var` sizing standards and scheduled cache cleanup in baseline operations.

Related Errors & Cross-Refs

`package-cleanup –oldkernels –count=2 && yum clean all && journalctl -xe`

Related tutorial: View the step-by-step tutorial for rhel-7.

View all rhel-7 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

RHEL 7 yum operations and disk planning guidance for update-heavy production systems.