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Node Security

Overview​

Learn about security best practices for running Circle Layer nodes.

Security Fundamentals​

1. System Security​

  • Regular updates
  • Firewall configuration
  • Access control
  • Resource limits

2. Network Security​

  • DDoS protection
  • Rate limiting
  • Port security
  • VPN usage

3. Application Security​

  • Secure configuration
  • Access management
  • Key security
  • Monitoring

Implementation​

1. System Hardening​

# Update system
sudo apt update
sudo apt upgrade -y

# Configure firewall
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow ssh
sudo ufw allow 26656/tcp
sudo ufw enable

### 2. Access Control
# Create service user
sudo useradd -m -s /bin/bash circlelayer
sudo usermod -aG docker circlelayer

# Set permissions
sudo chown -R circlelayer:circlelayer ~/.circlelayer

### 3. Monitoring Setup
# security-monitor.yml
alerts:
  - name: unauthorized_access
    condition: "failed_login_attempts > 3"
    action: "block_ip"
  
  - name: resource_abuse
    condition: "cpu_usage > 90%"
    action: "notify_admin"

## Best Practices

### 1. Key Management
- Secure storage
- Regular rotation
- Backup procedures
- Access control

### 2. Network Protection
- Use VPN
- Enable TLS
- Rate limiting
- DDoS protection

### 3. Monitoring
- Log analysis
- Alert system
- Performance monitoring
- Security scanning

## Incident Response

### 1. Detection
- Monitor logs
- Check metrics
- Review alerts
- Analyze patterns

### 2. Response
- Isolate node
- Block threats
- Update security
- Notify team

### 3. Recovery
- Restore backup
- Update systems
- Review logs
- Document incident

## Maintenance

### 1. Regular Tasks
- Update software
- Check logs
- Review access
- Test backups

### 2. Security Audits
- System scan
- Config review
- Access audit
- Update policies

### 3. Documentation
- Security procedures
- Incident reports
- Update logs
- Policy changes