CentOS Stream 10 – Common Problem 082 – 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

firewalld rich rules dropped after reload on CentOS Stream 10 disrupts services and slows incident response until the root cause is resolved.

Environment & Reproduction

Permanent rich rules disappear from runtime after firewalld reload due to syntax errors.

firewall-cmd --list-all
firewall-cmd --permanent --list-rich-rules

Root Cause Analysis

Misalignment between network configuration and CentOS Stream 10 defaults causes the failure path described above.

Quick Triage

Confirm package state, service status, and recent changes before deeper diagnostics.

systemctl status
rpm -qa | grep -i 
journalctl -p err -b --no-pager | tail -100

Step-by-Step Diagnosis

Capture detailed logs, configuration deltas, and runtime state to isolate the failing component.

journalctl -u firewalld -n 200
firewall-cmd --check-config

Solution – Primary Fix

Apply the targeted configuration change and restart the relevant services to restore expected behavior.

sudo firewall-cmd --permanent --remove-rich-rule=''
sudo firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address=10.0.0.0/24 accept'
sudo firewall-cmd --reload

Solution – Alternative Approaches

Migrate complex rule sets to nftables via firewalld’s nftables backend.

Verification & Acceptance Criteria

Validate the fix with deterministic checks and ensure no regressions in dependent services.

firewall-cmd --list-rich-rules
ss -tnlp

Rollback Plan

Revert configuration and restart services to return to the previous known-good state.

cp /etc/firewalld/zones/.xml.old /etc/firewalld/zones/.xml
firewall-cmd --reload

Prevention & Hardening

Validate firewalld config with –check-config in CI before deploy.

Related Errors & Cross-Refs

Related: rich rules, nftables backend; see also adjacent topics in the CentOS Stream 10 common problems series.

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

CentOS Stream documentation, Red Hat upstream guides, and CentOS Stream 10 release notes covering this subsystem.