App & Server Deep Dive

Master application lifecycle and production deployment patterns
Time: 45-60 minutes • Level: Advanced • Prerequisites: Essentials - App & Server

🎯 What You’ll Learn

• Application lifecycle hooks and management
• Multiple server coordination
• Graceful shutdown patterns
• Health checks and readiness probes
• Hot reload strategies
• Production monitoring and observability
• Custom listeners (FastHTTP, HTTP2, etc.)
• Zero-downtime deployment

📚 Topics

1. Application Lifecycle

Master app lifecycle management:

• Initialization hooks
• Startup sequence
• Shutdown sequence
• Cleanup and resource management

2. Multiple Server Management

Coordinate multiple servers:

• Server grouping
• Port management
• Server dependencies
• Coordinated shutdown

3. Graceful Shutdown

Handle shutdown properly:

• Request draining
• Connection cleanup
• Timeout configuration
• Signal handling

4. Health & Readiness

Implement health checks:

• Liveness probes
• Readiness probes
• Startup probes
• Custom health checks

5. Hot Reload

Update without downtime:

• Configuration reload
• Code hot swap
• Zero-downtime updates
• Canary deployments

6. Production Monitoring

Observe your application:

• Metrics collection
• Request tracing
• Error tracking
• Performance profiling

7. Custom Listeners

Use alternative HTTP servers:

• FastHTTP integration
• HTTP/2 and HTTP/3
• Unix socket listeners
• TLS configuration

8. Production Hardening

Secure and optimize:

• Rate limiting
• Request size limits
• Timeout configuration
• Resource limits

📂 Examples

All examples are in the examples/ folder:

01 - Lifecycle Hooks

Application initialization and shutdown.

02 - Multiple Servers

Coordinate multiple HTTP servers.

03 - Graceful Shutdown

Handle shutdown gracefully.

04 - Health Checks

Implement liveness and readiness probes.

05 - Production Monitoring

Metrics, tracing, and profiling.

🚀 Quick Start

# Run any example
cd docs/02-deep-dive/05-app-and-server/examples/01-lifecycle-hooks
go run main.go

# Test with provided test.http

📖 Prerequisites

Before diving in, make sure you understand:

• App & Server basics
• Server configuration
• Application structure

🎯 Learning Path

1. Understand lifecycle → Control app flow
2. Manage servers → Coordinate multiple servers
3. Shutdown gracefully → Handle termination
4. Add health checks → Enable monitoring
5. Monitor production → Observe behavior
6. Optimize → Improve performance
7. Deploy → Production best practices

💡 Key Takeaways

After completing this section:

• ✅ You’ll manage application lifecycle effectively
• ✅ You’ll coordinate multiple servers
• ✅ You’ll implement graceful shutdown
• ✅ You’ll add comprehensive health checks
• ✅ You’ll monitor production applications
• ✅ You’ll deploy with zero downtime
• ✅ You’ll harden for production

🏗️ Production Architecture

Load Balancer
     |
     ├─► App Instance 1 (Port 8080)
     │   ├─► Health: /health
     │   ├─► Metrics: /metrics
     │   └─► API: /api/*
     │
     ├─► App Instance 2 (Port 8081)
     │   └─► (same structure)
     │
     └─► App Instance N (Port 808N)
         └─► (same structure)

Scalable, observable, resilient!

Coming Soon - Examples and detailed content are being prepared.