# MEV Bot L2 Deployment Guide

## 🚀 Production Deployment - Arbitrum L2 Optimized

This guide covers deploying the MEV bot with full L2 message processing capabilities for maximum competitive advantage on Arbitrum.

## Prerequisites

### System Requirements
- **CPU**: 8+ cores (16+ recommended for high-frequency L2 processing)
- **RAM**: 16GB minimum (32GB+ recommended)
- **Storage**: 100GB SSD (fast I/O for L2 message processing)
- **Network**: High-bandwidth, low-latency connection to Arbitrum nodes

### Required Services
- **Arbitrum RPC Provider**: Alchemy, Infura, or QuickNode (WebSocket support required)
- **Monitoring**: Prometheus + Grafana (optional but recommended)
- **Alerting**: Slack/Discord webhooks for real-time alerts

## Quick Start

### 1. Clone and Build
```bash
git clone https://github.com/your-org/mev-beta.git
cd mev-beta
go build -o mev-bot ./cmd/mev-bot/main.go
```

### 2. Environment Setup
```bash
# Create environment file
cat > .env << EOF
# Arbitrum L2 Configuration
ARBITRUM_RPC_ENDPOINT="wss://arb-mainnet.g.alchemy.com/v2/YOUR_ALCHEMY_KEY"
ARBITRUM_WS_ENDPOINT="wss://arb-mainnet.g.alchemy.com/v2/YOUR_ALCHEMY_KEY"

# Performance Tuning
BOT_MAX_WORKERS=25
BOT_CHANNEL_BUFFER_SIZE=1000
BOT_POLLING_INTERVAL=0.25

# Monitoring
METRICS_ENABLED=true
METRICS_PORT=9090

# Alerting
SLACK_WEBHOOK="https://hooks.slack.com/services/YOUR/SLACK/WEBHOOK"
DISCORD_WEBHOOK="https://discord.com/api/webhooks/YOUR/DISCORD/WEBHOOK"
EOF
```

### 3. Production Configuration
```bash
# Copy production config
cp config/config.production.yaml config/config.yaml

# Update with your API keys
sed -i 's/YOUR_ALCHEMY_KEY/your-actual-key/g' config/config.yaml
sed -i 's/YOUR_INFURA_KEY/your-actual-key/g' config/config.yaml
```

### 4. Start the Bot
```bash
# With environment variables
source .env && ./mev-bot start

# Or with direct flags
METRICS_ENABLED=true ./mev-bot start
```

## Advanced Deployment

### Docker Deployment
```dockerfile
# Dockerfile
FROM golang:1.24-alpine AS builder
WORKDIR /app
COPY . .
RUN go build -o mev-bot ./cmd/mev-bot/main.go

FROM alpine:latest
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=builder /app/mev-bot .
COPY --from=builder /app/config ./config
CMD ["./mev-bot", "start"]
```

```bash
# Build and run
docker build -t mev-bot .
docker run -d \
  --name mev-bot-production \
  -p 9090:9090 \
  -p 8080:8080 \
  -e ARBITRUM_RPC_ENDPOINT="wss://your-endpoint" \
  -e METRICS_ENABLED=true \
  -v $(pwd)/data:/data \
  -v $(pwd)/logs:/var/log/mev-bot \
  mev-bot
```

### Docker Compose (Recommended)

The project includes a production-ready `docker-compose.yml` with auto-restart capabilities:

```bash
# 1. Copy the environment template
cp .env.example .env

# 2. Edit .env with your configuration
nano .env

# 3. Build and start the container
docker compose up -d

# 4. Check status
docker compose ps
docker compose logs -f mev-bot
```

The `docker-compose.yml` includes:
- `restart: always` - Container restarts automatically on failure or reboot
- Health checks - Monitors container health
- Resource limits - Prevents resource exhaustion
- Security hardening - Runs with minimal privileges

#### Auto-Start on Boot with systemd

To ensure the Docker container starts on boot, create a systemd service:

```bash
# 1. Copy the service file
sudo cp scripts/mev-bot.service /etc/systemd/system/

# 2. Reload systemd
sudo systemctl daemon-reload

# 3. Enable auto-start on boot
sudo systemctl enable mev-bot.service

# 4. Start the service
sudo systemctl start mev-bot.service

# 5. Check status
sudo systemctl status mev-bot.service
```

The systemd service will:
- Start automatically on system boot
- Pull latest image on start (if configured)
- Restart on failure
- Integrate with system logs (`journalctl -u mev-bot`)

#### Managing the Production Container

```bash
# View logs
docker compose logs -f mev-bot

# Restart the container
docker compose restart mev-bot
# Or using systemd
sudo systemctl restart mev-bot

# Stop the container
docker compose down
# Or using systemd
sudo systemctl stop mev-bot

# Update and restart
git pull origin master
docker compose up -d --build
# Or using systemd
sudo systemctl reload mev-bot

# View container stats
docker stats mev-bot-production
```

### Advanced Docker Compose Configuration

For a full monitoring stack with Prometheus and Grafana:

```yaml
# docker-compose.full.yml (example)
version: '3.8'

services:
  mev-bot:
    build: .
    container_name: mev-bot-l2
    restart: always
    ports:
      - "9090:9090"  # Metrics
      - "8080:8080"  # Health checks
    environment:
      - ARBITRUM_RPC_ENDPOINT=${ARBITRUM_RPC_ENDPOINT}
      - ARBITRUM_WS_ENDPOINT=${ARBITRUM_WS_ENDPOINT}
      - BOT_MAX_WORKERS=25
      - BOT_CHANNEL_BUFFER_SIZE=1000
      - METRICS_ENABLED=true
      - LOG_LEVEL=info
    volumes:
      - ./data:/data
      - ./logs:/var/log/mev-bot
      - ./config:/app/config
    networks:
      - mev-network
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
      interval: 30s
      timeout: 10s
      retries: 3

  prometheus:
    image: prom/prometheus:latest
    container_name: mev-prometheus
    restart: unless-stopped
    ports:
      - "9091:9090"
    volumes:
      - ./monitoring/prometheus.yml:/etc/prometheus/prometheus.yml
      - prometheus_data:/prometheus
    command:
      - '--config.file=/etc/prometheus/prometheus.yml'
      - '--storage.tsdb.path=/prometheus'
      - '--web.console.libraries=/etc/prometheus/console_libraries'
      - '--web.console.templates=/etc/prometheus/consoles'
    networks:
      - mev-network

  grafana:
    image: grafana/grafana:latest
    container_name: mev-grafana
    restart: unless-stopped
    ports:
      - "3000:3000"
    environment:
      - GF_SECURITY_ADMIN_PASSWORD=admin
    volumes:
      - grafana_data:/var/lib/grafana
      - ./monitoring/grafana-dashboard.json:/etc/grafana/provisioning/dashboards/mev-dashboard.json
    networks:
      - mev-network

volumes:
  prometheus_data:
  grafana_data:

networks:
  mev-network:
    driver: bridge
```

### Monitoring Setup

#### Prometheus Configuration
```yaml
# monitoring/prometheus.yml
global:
  scrape_interval: 15s

scrape_configs:
  - job_name: 'mev-bot'
    static_configs:
      - targets: ['mev-bot:9090']
    scrape_interval: 5s
    metrics_path: '/metrics/prometheus'
```

#### Grafana Dashboard
```json
{
  "dashboard": {
    "title": "MEV Bot L2 Monitoring",
    "panels": [
      {
        "title": "L2 Messages/Second",
        "type": "graph",
        "targets": [
          {
            "expr": "mev_bot_l2_messages_per_second"
          }
        ]
      },
      {
        "title": "Net Profit (ETH)",
        "type": "singlestat",
        "targets": [
          {
            "expr": "mev_bot_net_profit_eth"
          }
        ]
      },
      {
        "title": "Error Rate",
        "type": "graph",
        "targets": [
          {
            "expr": "mev_bot_error_rate"
          }
        ]
      }
    ]
  }
}
```

## Performance Optimization

### L2 Message Processing Tuning

#### High-Frequency Settings
```yaml
# config/config.yaml
bot:
  polling_interval: 0.1        # 100ms polling
  max_workers: 50              # High worker count
  channel_buffer_size: 2000    # Large buffers
  
arbitrum:
  rate_limit:
    requests_per_second: 100   # Aggressive rate limits
    max_concurrent: 50
    burst: 200
```

#### Memory Optimization
```bash
# System tuning
echo 'vm.swappiness=1' >> /etc/sysctl.conf
echo 'net.core.rmem_max=134217728' >> /etc/sysctl.conf
echo 'net.core.wmem_max=134217728' >> /etc/sysctl.conf
sysctl -p
```

### Database Optimization
```yaml
database:
  max_open_connections: 100
  max_idle_connections: 50
  connection_max_lifetime: "1h"
```

## Security Configuration

### Network Security
```bash
# Firewall rules
ufw allow 22/tcp    # SSH
ufw allow 9090/tcp  # Metrics (restrict to monitoring IPs)
ufw allow 8080/tcp  # Health checks (restrict to load balancer)
ufw deny 5432/tcp   # Block database access
ufw enable
```

### API Key Security
```bash
# Use environment variables, never hardcode
export ARBITRUM_RPC_ENDPOINT="wss://..."
export ALCHEMY_API_KEY="..."

# Or use secrets management
kubectl create secret generic mev-bot-secrets \
  --from-literal=rpc-endpoint="wss://..." \
  --from-literal=api-key="..."
```

### Process Security
```bash
# Run as non-root user
useradd -r -s /bin/false mevbot
chown -R mevbot:mevbot /app
sudo -u mevbot ./mev-bot start
```

## Monitoring and Alerting

### Health Checks
```bash
# Simple health check
curl http://localhost:8080/health

# Detailed metrics
curl http://localhost:9090/metrics | grep mev_bot
```

### Alert Rules
```yaml
# alertmanager.yml
groups:
  - name: mev-bot-alerts
    rules:
      - alert: HighErrorRate
        expr: mev_bot_error_rate > 0.05
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "MEV Bot error rate is high"
          
      - alert: L2MessageLag
        expr: mev_bot_l2_message_lag_ms > 1000
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "L2 message processing lag detected"
          
      - alert: LowProfitability
        expr: mev_bot_net_profit_eth < 0
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: "Bot is losing money"
```

## Troubleshooting

### Common Issues

#### L2 Message Subscription Failures
```bash
# Check WebSocket connectivity
wscat -c wss://arb-mainnet.g.alchemy.com/v2/YOUR_KEY

# Verify endpoints
curl -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' \
  https://arb-mainnet.g.alchemy.com/v2/YOUR_KEY
```

#### High Memory Usage
```bash
# Monitor memory
htop
# Check for memory leaks
pprof http://localhost:9090/debug/pprof/heap
```

#### Rate Limiting Issues
```bash
# Check rate limit status
grep "rate limit" /var/log/mev-bot/mev-bot.log
# Adjust rate limits in config
```

### Logs Analysis
```bash
# Real-time log monitoring
tail -f /var/log/mev-bot/mev-bot.log | grep "L2 message"

# Error analysis
grep "ERROR" /var/log/mev-bot/mev-bot.log | tail -20

# Performance metrics
grep "processing_latency" /var/log/mev-bot/mev-bot.log
```

## Backup and Recovery

### Data Backup
```bash
# Backup database
cp /data/mev-bot-production.db /backup/mev-bot-$(date +%Y%m%d).db

# Backup configuration
tar -czf /backup/mev-bot-config-$(date +%Y%m%d).tar.gz config/
```

### Disaster Recovery
```bash
# Quick recovery
systemctl stop mev-bot
cp /backup/mev-bot-YYYYMMDD.db /data/mev-bot-production.db
systemctl start mev-bot
```

## Scaling

### Horizontal Scaling
```yaml
# kubernetes deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mev-bot-l2
spec:
  replicas: 3
  selector:
    matchLabels:
      app: mev-bot
  template:
    metadata:
      labels:
        app: mev-bot
    spec:
      containers:
      - name: mev-bot
        image: mev-bot:latest
        resources:
          requests:
            cpu: 2000m
            memory: 4Gi
          limits:
            cpu: 4000m
            memory: 8Gi
```

### Load Balancing
```nginx
# nginx.conf
upstream mev-bot {
    server mev-bot-1:8080;
    server mev-bot-2:8080;
    server mev-bot-3:8080;
}

server {
    listen 80;
    location /health {
        proxy_pass http://mev-bot;
    }
}
```

## Performance Benchmarks

### Expected Performance
- **L2 Messages/Second**: 500-1000 msgs/sec
- **Processing Latency**: <100ms average
- **Memory Usage**: 2-4GB under load
- **CPU Usage**: 50-80% with 25 workers

### Optimization Targets
- **Error Rate**: <1%
- **Uptime**: >99.9%
- **Profit Margin**: >10% after gas costs

## Support and Maintenance

### Regular Maintenance
```bash
# Weekly tasks
./scripts/health-check.sh
./scripts/performance-report.sh
./scripts/profit-analysis.sh

# Monthly tasks
./scripts/log-rotation.sh
./scripts/database-cleanup.sh
./scripts/config-backup.sh
```

### Updates
```bash
# Update bot
git pull origin main
go build -o mev-bot ./cmd/mev-bot/main.go
systemctl restart mev-bot

# Update dependencies
go mod tidy
go mod vendor
```

---

## ⚡ Quick Commands

```bash
# Start with monitoring
METRICS_ENABLED=true ./mev-bot start

# Check health
curl localhost:8080/health

# View metrics
curl localhost:9090/metrics

# Check logs
tail -f logs/mev-bot.log

# Stop gracefully
pkill -SIGTERM mev-bot
```

**Your MEV bot is now ready for production deployment with full L2 message processing capabilities!** 🚀