Cheatsheets
Linux troubleshooting steps

Linux troubleshooting steps

Check system logs

Review log files under /var/log/ (e.g., syslog, dmesg, and auth.log) for system errors, security events, or crashes.
Monitor resource usage with top or htop

Use top or htop to analyze CPU, memory, and process usage to identify performance bottlenecks.
Verify disk usage

Check available disk space using df -h and disk usage per directory with du -sh to avoid running out of space.
Inspect network connectivity

Use ping, traceroute, and netstat to troubleshoot network connectivity and open ports.
Check process status

Use ps or systemctl to verify if services are running and to investigate processes that are consuming excessive resources.
Audit file permissions

Ensure correct file and directory permissions with ls -l to prevent access or execution issues.
Update system packages

Run apt-get update or yum update to ensure all installed packages and kernels are up to date and secure.

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Linux troubleshooting steps