🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026

📖 ~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 clock drifts or jumps because multiple time synchronization daemons compete for control.

Environment & Reproduction

Frequent time corrections, inconsistent timestamps in journalctl, and authentication or TLS errors in applications.

Root Cause Analysis

Both chronyd and ntpd enabled, legacy startup scripts left active, or configuration migration not completed.

Quick Triage

Use systemctl status chronyd, systemctl status ntpd, and timedatectl to determine active synchronization components.

Step-by-Step Diagnosis

Inspect journalctl for competing daemon messages and repeated step adjustments.

Illustrative mockup for rhel-7 — rhel7-119-chronyd-ntpd-conflict.webp
system logs showing chronyd and ntpd conflict on the same host — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Review unit enablement and configuration files to ensure only one authoritative time daemon remains active.

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Illustrative mockup for rhel-7 — rhel7-119-disable-ntpd-enable-chronyd.webp
Disabling ntpd and enabling chronyd for consistent time sync — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Disable and stop ntpd, enable chronyd, restart chronyd, and verify stable tracking with chronyc tracking and sources.

Verification & Acceptance Criteria

Ensure firewalld allows UDP 123 traffic as needed; SELinux defaults generally allow chronyd operation.

Rollback Plan

Confirm single-daemon operation with systemctl and monitor time stability over several sync intervals.

Prevention & Hardening

If chronyd cannot meet constraints, revert to prior daemon model in a controlled, single-service configuration.

Standardize on one time service in system build templates and audit enabled units periodically.

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 RHEL 7 time synchronization guides and chrony migration notes.

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