RHEL 7 yum GPG Key Mismatch on Repository Metadata

📖 ~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 transactions abort with signature or key mismatch errors. Security patching is delayed and downstream service upgrades cannot proceed.

Environment & Reproduction

Observed when repository keys rotate, mirror metadata is stale, or proxies serve outdated artifacts. systemctl and journalctl reveal timing around failed update jobs.

Root Cause Analysis

The configured GPG key does not match signed metadata or package payload. firewalld egress filtering and SELinux policy can block key retrieval endpoints.

Quick Triage

List imported RPM keys, verify repo baseurl and gpgkey entries, and inspect yum and journalctl output. Confirm network path through firewalld and service proxy settings.

Step-by-Step Diagnosis

Validate key fingerprints from trusted source, test mirror freshness, and check for transparent proxy cache issues. Review SELinux audit logs for blocked key fetches.

Solution – Primary Fix

Import the correct GPG key, clean yum cache, refresh metadata, and retry transactions. Restart update automation service via systemctl and verify journalctl success entries.

Solution – Alternative Approaches

Switch to vetted mirror endpoints, use internal repository mirroring, or enforce signed metadata validation centrally.

Verification & Acceptance Criteria

yum update completes without signature errors, and package authenticity checks pass. Scheduled service patch jobs run successfully.

Rollback Plan

Revert repository changes and restore previous trusted key set from backup if needed. Undo related package changes using yum history.

Prevention & Hardening

Track key rotation notices, automate fingerprint verification, and monitor failed signature events in journalctl. Maintain strict firewalld and SELinux policy clarity.

Related Errors & Cross-Refs

Related problems include expired repo certificates and metadata checksum mismatch. See linked tutorial 9062 for repository trust-chain management.

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

Consult man yum, man rpmkeys, man systemctl, man service, man firewall-cmd, SELinux docs, and man journalctl.