# MyceliumCloud Examples Roadmap

Comprehensive progression of Kubernetes examples designed to teach MyceliumCloud deployment patterns from beginner to advanced levels.

## 📋 Examples Progression

### Completed Examples

#### 1. Hello World ✅
- **Difficulty**: ⭐ Easy
- **Status**: ✅ **COMPLETED**
- **Learning Focus**: Basic Kubernetes deployment, service creation, port-forwarding
- **Template**: Established efficient pattern with `hello-world.md` + `hello-world-deployment.yaml` + `hello-world-service.yaml`
- **Key Concepts**: Pods, Deployments, Services, LoadBalancer, port-forward

#### 2. Nginx Static Site ✅
- **Difficulty**: ⭐ Easy
- **Status**: ✅ **COMPLETED**
- **Learning Focus**: Static content serving, custom HTML, nginx configuration
- **Template**: Same efficient pattern with `nginx-static.md` + `nginx-static-deployment.yaml` + `nginx-static-service.yaml` + `default-index.html`
- **Key Concepts**: Static files, nginx deployment, custom configuration, ConfigMaps, HTML serving

#### 3. Python Flask API ✅
- **Difficulty**: ⭐ Easy-Medium
- **Status**: ✅ **COMPLETED**
- **Learning Focus**: Application containerization, Python web services
- **Template**: Same efficient pattern with `python-flask.md` + `python-flask-deployment.yaml` + `python-flask-service.yaml` + `app.py`
- **Key Concepts**: Python containers, API development, HTTP services, JSON responses, RESTful design

#### 4. Nginx Mycelium IPv6 Hosting ✅
- **Difficulty**: ⭐⭐ Medium
- **Status**: ✅ **COMPLETED**
- **Learning Focus**: IPv6 web hosting, peer-to-peer networking, global accessibility
- **Template**: Same efficient pattern with `nginx-mycelium.md` + `mycelium-website-nodeport.yaml` + supporting scripts
- **Key Concepts**: IPv6-only hosting, hostNetwork deployment, peer-to-peer web hosting, global accessibility

#### 5. Redis Cache ✅
- **Difficulty**: ⭐⭐ Medium
- **Status**: ✅ **COMPLETED**
- **Learning Focus**: Data storage, caching patterns, stateful services
- **Template**: Same efficient pattern with `redis-cache.md` + `redis-cache-deployment.yaml` + `redis-cache-service.yaml` + `web-interface.py`
- **Key Concepts**: Redis deployment, data persistence, cache strategies, web interface

#### 6. Nginx NodePort Website ✅
- **Difficulty**: ⭐⭐ Medium
- **Status**: ✅ **COMPLETED**
- **Learning Focus**: Standard Kubernetes NodePort services, multi-replica scaling, worker node preferences
- **Template**: Enhanced pattern with `nginx-nodeport.md` + `nginx-nodeport-deployment.yaml` + `nginx-nodeport-service.yaml` + `nginx-nodeport-configmaps.yaml` + supporting scripts (`update-content-single.sh`, `update-content-many.sh`, `debug-networking.sh`)
- **Key Concepts**: NodePort services, IPv6 global access, multi-replica scaling, worker-only deployments, network debugging, production-ready scaling

### Planned Examples (Future)

#### 7. PostgreSQL Database
- **Difficulty**: ⭐⭐ Medium
- **Status**: 📋 Planned
- **Learning Focus**: Stateful applications, database deployment
- **Template**: Same efficient pattern
- **Key Concepts**: Persistent volumes, databases, data persistence

#### 8. WordPress
- **Difficulty**: ⭐⭐⭐ Hard
- **Status**: 📋 Planned
- **Learning Focus**: Multi-container applications, CMS deployment
- **Template**: Same efficient pattern
- **Key Concepts**: Multi-container apps, database integration, CMS deployment

#### 9. Node.js API
- **Difficulty**: ⭐⭐⭐ Hard
- **Status**: 📋 Planned
- **Learning Focus**: Modern web development, API services
- **Template**: Same efficient pattern
- **Key Concepts**: JavaScript/Node.js, API development, modern frameworks

#### 10. Jenkins CI/CD
- **Difficulty**: ⭐⭐⭐ Hard
- **Status**: 📋 Planned
- **Learning Focus**: Infrastructure automation, CI/CD pipelines
- **Template**: Same efficient pattern
- **Key Concepts**: DevOps tools, automation, infrastructure as code

#### 11. Nextcloud
- **Difficulty**: ⭐⭐⭐ Very Hard
- **Status**: 📋 Planned
- **Learning Focus**: Enterprise applications, file sharing, high availability
- **Template**: Same efficient pattern
- **Key Concepts**: Enterprise deployment, file services, advanced networking

## 🎯 Learning Progression Strategy

### Easy Level (⭐)
**Focus**: Basic deployment and networking
- Hello World: Basic web app
- Nginx Static Site: Static content
- Python Flask API: Simple web service

**Skills Taught**:
- Pod creation and management
- Service types and networking
- Port-forwarding for external access
- Basic troubleshooting

### Medium Level (⭐⭐)
**Focus**: Advanced networking and data services
- Nginx Mycelium IPv6 Hosting: Peer-to-peer IPv6 web hosting
- Redis Cache: In-memory data and caching
- Nginx NodePort Website: Standard K8s NodePort services
- PostgreSQL Database: Persistent data

**Skills Taught**:
- IPv6 networking and peer-to-peer hosting
- Stateful vs stateless applications
- Data persistence with volumes
- Database deployment patterns
- Service discovery
- Global accessibility via IPv6
- Multi-replica scaling
- Production-ready deployments

### Hard Level (⭐⭐⭐)
**Focus**: Complex applications and enterprise patterns
- WordPress: Multi-container CMS
- Node.js API: Modern web development
- Jenkins CI/CD: Infrastructure automation

**Skills Taught**:
- Multi-container applications
- Complex networking patterns
- Enterprise application deployment
- DevOps and automation

### Very Hard Level (⭐⭐⭐)
**Focus**: Advanced enterprise features
- Nextcloud: Full enterprise application

**Skills Taught**:
- High availability deployment
- Enterprise application patterns
- Advanced networking and security
- Production-ready configurations

## 🏗️ Standard Template Pattern

**All examples follow the same efficient template pattern established with hello-world:**

```
📁 example-name/
├── 📄 example-name.md              ← Complete guide + troubleshooting
├── 📄 example-name-deployment.yaml ← Application logic
└── 📄 example-name-service.yaml    ← Networking configuration
```

**Template Benefits**:
- ✅ Consistent structure across all examples
- ✅ Easy to copy and adapt for new examples
- ✅ Self-contained documentation in each example
- ✅ Clear separation of concerns (app vs networking)
- ✅ Proven pattern tested and working on MyceliumCloud

## 📚 Documentation Standards

### Individual Example Structure
Each example includes:
- **Quick Start Guide** - 5-minute deployment
- **Architecture Overview** - What it does and why
- **Step-by-Step Deployment** - Copy-paste commands
- **Testing Instructions** - How to verify it works
- **Troubleshooting Section** - Common issues and solutions
- **Cleanup Instructions** - How to remove resources
- **Pro Tips** - Advanced usage and best practices

### Example Pattern Consistency
- **Easy Examples**: 30-45 minutes to complete
- **Medium Examples**: 1-2 hours to complete  
- **Hard Examples**: 2-4 hours to complete
- **Very Hard Examples**: 4+ hours to complete

## 🎓 Skills Matrix

| Example | Containers | Persistence | Multi-Container | Load Balancing | Databases | APIs | DevOps | Enterprise | IPv6 | Peer-to-Peer | NodePort | Multi-Replica |
|---------|------------|-------------|-----------------|----------------|-----------|------|--------|------------|-----|--------------|----------|---------------|
| Hello World | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Nginx Static | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Python Flask | ✅ | ❌ | ❌ | ✅ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Nginx Mycelium IPv6 | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ | ✅ | ❌ | ❌ |
| Redis Cache | ✅ | ❌ | ❌ | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Nginx NodePort Website | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ | ✅ | ✅ |
| PostgreSQL | ✅ | ✅ | ❌ | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| WordPress | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Node.js API | ✅ | ❌ | ❌ | ✅ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Jenkins CI/CD | ✅ | ✅ | ❌ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Nextcloud | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ |

## 🚀 Current Status & Next Steps

### Completed Examples ✅
- **Hello World** - Basic Kubernetes deployment (Completed)
- **Nginx Static Site** - Static content serving (Completed)
- **Python Flask API** - Web service development (Completed)
- **Nginx Mycelium IPv6** - Peer-to-peer IPv6 web hosting (Completed)
- **Redis Cache** - Data caching services (Completed)
- **Nginx NodePort Website** - Standard K8s NodePort services with multi-replica scaling (Completed)

### Next Planned Example
1. **PostgreSQL Database** - Stateful database deployment
   - Copy nginx-nodeport template structure
   - Adapt for PostgreSQL database needs
   - Include persistent volume management
   - Test database connectivity and data persistence

### Development Workflow (Proven Pattern)
1. **Use Template**: Copy from previous successful example
2. **Adapt Content**: Modify for specific application needs
3. **Test on Cluster**: Verify works on MyceliumCloud
4. **Document Thoroughly**: Include troubleshooting section
5. **Verify Pattern**: Ensure consistent with overall strategy

### Quality Standards
- All examples must be **end-to-end tested**
- All examples must follow the **standard template**
- All examples must include **troubleshooting sections**
- All examples must be **copy-paste ready**
- All examples must include **cleanup instructions**

### Special Focus Areas
- **IPv6 Networking**: Mycelium's unique capability for global IPv6 access
- **Multi-Replica Scaling**: Production-ready scaling patterns
- **Worker Node Preferences**: Best practices for separating control plane and worker workloads
- **Network Debugging**: Tools and techniques for troubleshooting connectivity issues

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**Goal**: Provide MyceliumCloud users with a complete learning path from basic Kubernetes deployment to enterprise application management, using proven patterns and consistent documentation, with special emphasis on IPv6 networking and production-ready scaling.