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Linux troubleshooting is a critical skill for system administrators, DevOps engineers, and cybersecurity professionals. Below is a comprehensive guide to diagnosing and resolving common Linux issues, along with practical commands and steps.
Common Linux Issues & Solutions
1. High CPU Usage
Use top, htop, or `atop` to identify processes consuming excessive CPU.
top htop ps aux --sort=-%cpu | head -n 5
Kill problematic processes:
kill -9 <PID>
2. Memory Leaks
Check memory usage with:
free -h vmstat 1
Find memory-hogging processes:
ps aux --sort=-%mem | head
3. Disk Space Issues
Locate large files:
df -h du -sh | sort -rh | head
Clean up old logs:
journalctl --vacuum-size=100M
4. Network Connectivity Problems
Check network interfaces:
ip a ifconfig
Test connectivity:
ping google.com traceroute google.com
Inspect open ports:
ss -tulnp netstat -tulnp
5. Service Failures
Check service status:
systemctl status <service> journalctl -u <service> -xe
Restart a service:
systemctl restart <service>
6. Permission Issues
Fix incorrect permissions:
chmod 755 /path/to/file chown user:group /path/to/file
You Should Know:
- Log Analysis: Use
grep,awk, and `sed` to parse logs.grep "error" /var/log/syslog tail -f /var/log/nginx/error.log
- Kernel Debugging: Use `dmesg` for hardware-related errors.
dmesg | grep -i error
- Bash Scripting for Automation: Automate checks with:
!/bin/bash if [ $(df -h / | awk 'NR==2 {print $5}' | tr -d '%') -gt 90 ]; then echo "Disk space critical!" fi
What Undercode Say:
Linux troubleshooting requires a systematic approach—monitor system resources, analyze logs, and verify configurations. Mastering these commands enhances efficiency in diagnosing issues. Automation with scripting reduces manual intervention, making systems more resilient.
Expected Output:
A well-documented troubleshooting process with actionable commands for resolving Linux system issues efficiently.
(Note: No irrelevant URLs or non-IT content was found in the original post.)
References:
Reported By: Maaouiaadem Linux – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
