CentOS Stream 8 troubleshooting methods

CentOS Stream 8 System Troubleshooting Guide

This article provides systematic steps to help you effectively troubleshoot CentOS Stream 8 system failures. Please try the following in order:

1. Network connection test:

• Use the ping command to test network connectivity (for example: ping google.com ).
• Use the curl command to check the HTTP request response (for example: curl google.com ).
• Use ip link command to view the status of the network interface and confirm whether the network interface is operating normally and is connected.

2. IP address and gateway configuration verification:

• Use ip addr or ifconfig command to check the network interface configuration to ensure that the IP address, subnet mask and gateway settings are correct.

3. DNS resolution check:

• Use nslookup or dig command to check whether the domain name resolution is normal (for example: nslookup google.com ).

4. Firewall Rule Review:

• Use iptables -L command to view the firewall rules and confirm whether the rules allow necessary network traffic. If necessary, add or delete rules. (Note: Be careful when operating firewall rules, as incorrect operations may cause the system to fail to access the network).

5. Network service status confirmation:

• Use the systemctl status command to check the status of network-related services (for example: systemctl status network ), and use the systemctl start or systemctl restart command to start or restart the service.

6. System log analysis:

• Check the system log file /var/log/messages or /var/log/syslog for error messages and exception records.
• Use the journalctl command to view more detailed system logs and use filter conditions to find specific errors (for example: journalctl -xe to view recent errors).

7. File system integrity check:

• Use df -h and du -sh commands to check disk space usage to troubleshoot insufficient disk space.
• Use the fsck command to check and fix file system errors (for example: fsck /dev/sda1 Note: Before executing the fsck command, please make sure that the system has backed up important data, as incorrect operations may lead to data loss ).

8. Service status monitoring:

• Using systemctl status<service_name></service_name> Commands check the running status of a specific service.

9. Software source configuration check:

• If you encounter problems that the software package cannot be downloaded or updated, please check the software source configuration file in the /etc/yum.repos.d/ directory to ensure that the software source is configured correctly, and try to replace the software source.

10. System resource monitoring:

• Use top , htop , vmstat , iostat and other system monitoring tools to monitor the use of resources such as CPU, memory, disk I/O and network I/O in real time to help locate performance bottlenecks.

11. Hardware status check:

• Check the operating status of hardware devices (such as CPU, memory, hard disk, network card) to ensure that the hardware is not faulty.

12. Advanced diagnostic tools:

• Use the strace command to track system calls and signals to help locate problems in the program.
• Use perf command to perform performance analysis to find performance bottlenecks.

If the above steps still fail to resolve the problem, please refer to the relevant documentation or seek technical support. Remember to back up important data before performing any system-level operations.

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