Troubleshooting

Go beyond the basics of journalctl — output formats, field-level filtering, full-text search, persistent storage, disk management, user services, and exporting logs for analysis.

Where Linux logs live, how to read the systemd journal with journalctl, how to work with traditional log files, and practical patterns for finding what you need when something breaks.

A methodical approach to diagnosing network problems on Linux — working layer by layer from physical connectivity to application-level issues.