Troubleshooting
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Systematic approaches to diagnosing Linux problems.
Overview
Section titled “Overview”Troubleshooting isn’t guesswork—it’s methodology. This section teaches systematic approaches to finding root causes, using logs effectively, and debugging at different levels of the stack.
Modules
Section titled “Modules”| # | Module | Description | Time |
|---|---|---|---|
| 6.1 | Systematic Troubleshooting | Methodologies: hypothesis-driven, divide & conquer, timeline | 25-30 min |
| 6.2 | Log Analysis | journald, syslog, log patterns, correlation | 25-30 min |
| 6.3 | Process Debugging | strace, ltrace, /proc, debugging hung processes | 30-35 min |
| 6.4 | Network Debugging | tcpdump, ss, connectivity issues, DNS problems | 30-35 min |
Why This Section Matters
Section titled “Why This Section Matters”Production issues don’t come with error messages. Systematic debugging skills help you:
- Find root causes faster — Not just symptoms
- Debug Kubernetes issues — Many have Linux causes
- Handle incidents — Methodical approach reduces MTTR
- Learn from failures — Understand what actually happened
Prerequisites
Section titled “Prerequisites”- Performance — USE method and metrics
- Networking — TCP/IP and iptables
- Security Hardening — SELinux/AppArmor denials
Key Takeaways
Section titled “Key Takeaways”After completing this section, you’ll understand:
- How to approach problems systematically
- How to use logs effectively
- How to trace process behavior
- How to debug network connectivity
Related Sections
Section titled “Related Sections”- Previous: Performance
- Next: Shell Scripting
- CKA: Cluster troubleshooting domain