YUM GPG Key Verification Failures

📖 ~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

RHEL 7 yum transactions fail when package signatures cannot be validated against configured GPG keys.

Environment & Reproduction

yum install reports NOKEY, BAD SIGNATURE, or Public key for package is not installed messages.

Root Cause Analysis

Missing key import, expired repository key, incorrect gpgkey URL, or MITM proxy replacing metadata.

Quick Triage

Verify gpgcheck settings in repo files, run rpm -qa gpg-pubkey, and test repository metadata refresh with yum makecache.

Step-by-Step Diagnosis

Inspect journalctl -xe and /var/log/yum.log for exact key ID and package name failing verification.

Solution – Primary Fix

Open repo definitions to confirm gpgkey URLs and import required key material with rpm –import before retrying.

Solution – Alternative Approaches

Import the correct key, clear metadata using yum clean all, run yum makecache, and reattempt the failed yum transaction.

Verification & Acceptance Criteria

If key retrieval uses HTTPS through a local proxy, ensure SELinux permits proxy behavior and firewalld allows outbound connectivity.

Rollback Plan

Validate affected services with systemctl status and service status after package installation succeeds.

Prevention & Hardening

Use yum history undo if package replacement after key fix introduced regressions in runtime components.

Related Errors & Cross-Refs

Track key rotation dates, mirror vendor keys internally, and enforce repository integrity checks in automation.

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

See man rpm, man yum, and Red Hat documentation for secure package signing workflows on RHEL 7.