Ubuntu 22.04 Time Drift from Conflicting NTP Services

📖 ~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

System clock drifts, causing TLS validation failures, log ordering issues, and authentication problems.

Environment & Reproduction

Ubuntu 22.04 with systemd-timesyncd and chrony/ntpd simultaneously active, often after migration or role changes.

Root Cause Analysis

Competing time daemons discipline the clock differently, creating oscillation and persistent skew under unstable network conditions.

Quick Triage

Run timedatectl, systemctl list-units ‘*time*’ ‘*chrony*’ ‘*ntp*’, and compare current offset with chronyc tracking.

Step-by-Step Diagnosis

Identify enabled daemons, inspect their config sources, and correlate offset drift with service restarts in journal logs.

Solution – Primary Fix

Keep one authoritative NTP service (commonly chrony), disable others, restart selected daemon, and verify synchronization status.

Solution – Alternative Approaches

Use systemd-timesyncd only for simple endpoints, or deploy internal NTP hierarchy with explicit fallback peers.

Verification & Acceptance Criteria

Offset remains within policy threshold, timedatectl shows synchronized, and TLS/auth workflows succeed consistently.

Rollback Plan

Re-enable prior time service and restore old config if single-daemon migration impacts specialized timing requirements.

Prevention & Hardening

Standardize one time-sync stack per host role and monitor offset/jitter through infrastructure observability.

Related Errors & Cross-Refs

Related Ubuntu 22.04 errors include Kerberos clock skew, certificate not yet valid, and inconsistent distributed logs.

Related tutorial: View the step-by-step tutorial for Ubuntu 22.04 LTS.

View all Ubuntu 22.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

man timedatectl, chrony documentation, Ubuntu time synchronization guides, and NTP operational best practices.