Cloud-init stalls first boot networking on cloned images

📖 ~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

First boot hangs or delays because cloud-init cannot complete network setup.

Environment & Reproduction

Ubuntu 16.04 cloud images cloned across platforms with mismatched metadata sources.

Root Cause Analysis

Cloud-init waits on unavailable data source or conflicting network configuration.

Quick Triage

Check cloud-init status and identify blocking stage in boot logs.

Step-by-Step Diagnosis

Inspect datasource detection, network config artifacts, and cloud-init stage timings.

Solution – Primary Fix

Configure correct datasource list, clean stale state, and reinitialize cloud-init.

Solution – Alternative Approaches

Disable unneeded modules and bake provider-specific image variants.

Verification & Acceptance Criteria

Instance boots consistently with cloud-init complete and network online.

Rollback Plan

Revert cloud-init config changes and restore baseline image state.

Prevention & Hardening

Maintain per-cloud image pipelines and validate first-boot behavior automatically.

Related Errors & Cross-Refs

cloud-init timeout, datasource not found, and network-online wait failures.

Related tutorial: View the step-by-step tutorial for Ubuntu 16.04 LTS.

View all Ubuntu 16.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Cloud-init and Ubuntu image lifecycle operational documentation.