CentOS Stream 10 – Common Problem 030 – 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

nmcli connection up succeeds but interface keeps DHCP from old config.

Environment & Reproduction

Hosts migrated to keyfile plugin where ifcfg-* still exists.

cat /etc/os-release
uname -r
rpm -qa | grep 

Root Cause Analysis

Legacy ifcfg-* file shadows the keyfile profile.

Quick Triage

Confirm package, network, SELinux and firewall state.

nmcli -f NAME,DEVICE,UUID con show
ls /etc/NetworkManager/system-connections/
ls /etc/sysconfig/network-scripts/

Step-by-Step Diagnosis

Drill into network/nmcli state and recent journal entries to isolate the failure.

nmcli con show 
journalctl -u NetworkManager -n 100

Solution – Primary Fix

Apply the standard remediation for network/nmcli on CentOS Stream 10.

sudo mv /etc/sysconfig/network-scripts/ifcfg- /root/backup/
sudo systemctl restart NetworkManager
sudo nmcli con up 

Solution – Alternative Approaches

Convert legacy ifcfg-* via nmcli connection migrate.

Verification & Acceptance Criteria

Validate the fix with positive functional checks before closing.

ip a show 
nmcli -f IP4 con show 

Rollback Plan

Revert to the previous known-good configuration if the fix regresses.

cp /root/backup/ifcfg- /etc/sysconfig/network-scripts/
systemctl restart NetworkManager

Prevention & Hardening

Codify the fix in configuration management and add monitoring.

Manage profiles with nmstatectl declarative YAML.

Related Errors & Cross-Refs

DNS resolution loss and route metric conflicts.

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

NetworkManager keyfile documentation.