CentOS Stream 10 – Common Problem 102 – Diagnosis and Fix

📖 ~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

Daemon fails to start or bind ports with AVC denials in audit log.

Environment & Reproduction

Triggered by custom paths, non-default ports, or new ports in services.

Root Cause Analysis

SELinux policy lacks a label or boolean for the new configuration.

Quick Triage

Inspect ausearch -m AVC –start recent and journalctl for denials.

Step-by-Step Diagnosis

Use sealert and audit2allow to enumerate exact denied operations.

Solution – Primary Fix

Apply targeted semanage fcontext, restorecon, and boolean toggles.

Solution – Alternative Approaches

Switch service to permissive domain with semanage permissive briefly.

Verification & Acceptance Criteria

Service starts and ausearch shows no AVC after warm-up.

Rollback Plan

Remove custom policy module with semodule -r if regression occurs.

Prevention & Hardening

Document required booleans and labels in configuration management.

Related Errors & Cross-Refs

Related to httpd_can_network_connect and port_t labelling errors.

Related tutorial: View the step-by-step tutorial for centos-stream-10.

View all centos-stream-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Red Hat SELinux User and Administrator guides.