# 06 - TROUBLESHOOTING — Home
**Purpose:** Common issues, error resolutions, and debugging guides for Syslog infrastructure.

## Overview

This section provides solutions for common technical problems across the Syslog infrastructure stack. Each guide includes symptoms, root causes, and step-by-step fixes.

## Troubleshooting Categories

### **Proxmox & Virtualization**
- VM won't start or crashes
- GPU passthrough failures
- Network connectivity issues
- Storage performance problems
- Resource allocation errors

### **GPU & Hardware**
- AMD GPU detection failures
- ROCm driver installation issues
- Temperature and cooling problems
- Performance degradation
- Compatibility issues

### **AWS Cloud**
- EC2 instance connectivity
- S3 bucket access errors
- VPC networking issues
- Cost overrun alerts
- Security group misconfigurations

### **AI Agents & Models**
- Model loading failures
- Inference performance issues
- Agent communication errors
- API connectivity problems
- Memory allocation errors

### **Networking & Security**
- Firewall blocking issues
- DNS resolution failures
- SSL/TLS certificate problems
- Authentication errors
- Rate limiting and throttling

## Troubleshooting Methodology

### **Step 1: Gather Information**
- Error messages and logs
- System status and metrics
- Recent changes or updates
- User reports and symptoms

### **Step 2: Isolate the Problem**
- Reproduce the issue
- Identify affected components
- Check dependencies and connections
- Verify configurations

### **Step 3: Diagnose Root Cause**
- Check logs and monitoring
- Test individual components
- Compare with known working state
- Identify configuration drift

### **Step 4: Apply Fix**
- Implement solution
- Test thoroughly
- Document the fix
- Update monitoring alerts

### **Step 5: Prevent Recurrence**
- Update documentation
- Add monitoring checks
- Create automation scripts
- Train team members

## Quick Reference

### **Common Commands**
```bash
# Check system logs
journalctl -xe --no-pager | tail -100

# Check GPU status
rocm-smi
nvidia-smi

# Check network connectivity
ping -c 4 8.8.8.8
traceroute google.com

# Check disk space
df -h
du -sh /path/to/directory

# Check running processes
top -b -n 1 | head -20
ps aux | grep -i process_name
```

### **Log Locations**
- **Proxmox:** `/var/log/pve/`
- **System:** `/var/log/syslog`, `/var/log/messages`
- **GPU:** `/var/log/kern.log` (dmesg)
- **AWS:** CloudWatch Logs
- **Applications:** Application-specific log directories

## Emergency Procedures

### **Critical Issues**
1. **Service Down:** Check status, restart if needed, investigate root cause
2. **Data Loss:** Stop writes, assess backup, restore from backup
3. **Security Breach:** Isolate system, preserve logs, investigate scope
4. **Performance Crisis:** Throttle traffic, scale resources, optimize

### **Contact Escalation**
- **Level 1:** System administrators
- **Level 2:** Technical lead
- **Level 3:** External support (vendor, consultant)
- **Level 4:** Emergency response team

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*This troubleshooting guide is a living document. Update it with new issues and solutions as they are discovered.*