Linux System Troubleshooting & Security Auditing
Diagnose Linux issues, audit security configs, and optimize systems fast
What You Can Do
Use structured analysis to rapidly identify root causes in system logs, uncover security misconfigurations, and pinpoint performance bottlenecks. You'll get actionable remediation steps with compliance checks and rollback procedures—no manual log parsing needed.
Features
Parse syslog, journalctl, auth logs, and application logs to spot errors, patterns, and anomalies
Review SSH hardening, firewall rules, file permissions, sudo settings, and user access controls
Analyze CPU, memory, disk I/O, and network metrics to identify resource bottlenecks
Flag common misconfigurations like weak SSH keys, open ports, unnecessary services, and privilege escalation risks
Check alignment with CIS Benchmarks, PCI-DSS, and HIPAA security standards
Get step-by-step fixes, explanations, and safe rollback procedures for each issue
Track security and performance changes over time to spot degradation
Example Output
Security Audit Output
- ✅ SSH Hardening: 7/8 checks passed
- ✓ PasswordAuthentication disabled
- ✗ PermitRootLogin still enabled (HIGH RISK)
- ⚠ Key-based auth configured but weak cipher suite
Remediation:
sudo sed -i 's/^PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config
sudo systemctl restart ssh
Performance Report
CPU: 78% peak usage on process mysqld during 14:00-15:00 window
Memory: Swap thrashing detected — recommend increasing buffer pool from 4GB to 6GB
Disk I/O: /var/log filling up at 15GB/day — log rotation needed
Score: 6.5/10 — Address PermitRootLogin, memory tuning, and disk space within 48 hours.
What's Included
- SKILL.md: Structured troubleshooting and audit workflow with decision trees
- Security Audit Checklist: 50+ configuration checks mapped to CIS Benchmarks
- Log Analysis Templates: Regex patterns and queries for common issues (auth failures, OOM, disk full, network errors)
- Performance Baseline Template: CPU, memory, disk, and network baseline snapshot for trending
- Remediation Decision Tree: Prioritized fixes from critical to cosmetic, with rollback steps
- Compliance Scorecard: PCI-DSS, CIS, and HIPAA alignment scorecard
- Incident Response Playbook: Step-by-step triage for common emergencies (unresponsive server, disk full, compromised account)
Who It's For
- Linux System Administrators — Quickly troubleshoot outages and routine maintenance
- DevOps Engineers — Audit production infrastructure and optimize deployment pipelines
- Security Teams — Run compliance audits and perform vulnerability assessments
- Cloud Platform Engineers — Secure and optimize cloud VMs, Kubernetes nodes, and on-prem infrastructure
- IT Operations Managers — Establish baselines, track compliance, and prioritize fixes across servers
Best For
- Incident response & emergency triage — Diagnose critical issues (high load, disk full, service crashes) in minutes
- Regular security posture assessment — Run monthly or quarterly audits to catch drift and misconfigurations
- Performance tuning projects — Identify bottlenecks and model improvements before making changes
- Compliance audits — Map current state to CIS Benchmarks, PCI-DSS, or HIPAA requirements
- Post-incident root cause analysis — Understand what happened, why, and what to change
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