Ubuntu 16.04 LTS – cloud-init stalls and delays first boot provisioning – Fix & Prevention

📖 ~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 takes excessive time and configuration scripts do not finish.

Environment & Reproduction

Ubuntu 16.04 cloud image in virtualized or private cloud environment.

Root Cause Analysis

Datasource probing or network dependency prevents timely cloud-init completion.

Quick Triage

Check cloud-init status and inspect /var/log/cloud-init.log entries.

Step-by-Step Diagnosis

Identify datasource timeout points and unavailable metadata endpoints.

Solution – Primary Fix

Set correct datasource list, fix network availability, and rerun cloud-init.

Solution – Alternative Approaches

Disable unused cloud-init modules for static provisioning workflows.

Verification & Acceptance Criteria

cloud-init reaches done state and all intended config is applied.

Rollback Plan

Restore original cloud-init config and instance metadata settings.

Prevention & Hardening

Template validated datasource config across image builds.

Related Errors & Cross-Refs

Network interface initialization failures can trigger cloud-init stalls.

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 datasource selection and debugging guides.