Azure Cloud

WHAT IS APP SERVICE?
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A fully managed platform for hosting:
- ASP.NET Core Web APIs
- Blazor applications
- Web apps with MVC
- Node.js, Python, Java apps too

Azure manages:
✅ Operating system updates
✅ Load balancing
✅ SSL certificates
✅ Auto-scaling
✅ Monitoring and logging

You focus on:
📝 Writing code
🚀 Deploying
📊 Monitoring performance

---

DEPLOYMENT METHODS
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1. Visual Studio (One-Click)
   - Right-click project → Publish
   - Select Azure App Service
   - Click Publish

2. Azure CLI
   az webapp up --name myapp --resource-group mygroup

3. GitHub Actions (CI/CD)
   - Push to main branch
   - Automatic deployment

4. Docker Container
   - Deploy containerized apps
   - Great for microservices

---

PRICING TIERS
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Free (F1):
- 1 GB RAM, 1 GB storage
- 60 CPU minutes/day
- Good for: Learning, testing

Basic (B1): ~$13/month
- 1.75 GB RAM, 10 GB storage
- Custom domains, SSL
- Good for: Small production apps

Standard (S1): ~$70/month
- Auto-scaling (up to 10 instances)
- Daily backups
- Deployment slots (staging/production)
- Good for: Production apps

Premium (P1v3): ~$100/month
- More powerful hardware
- Better performance
- Good for: High-traffic apps

// HTTP TRIGGER - Triggered by HTTP request
[FunctionName("GetProduct")]
public static async Task GetProduct(
    [HttpTrigger(AuthorizationLevel.Function, "get", Route = "products/{id}")]
    HttpRequest req,
    int id,
    ILogger log)
{
    log.LogInformation($"Getting product {id}");

    var product = await _productService.GetByIdAsync(id);

    if (product == null)
        return new NotFoundResult();

    return new OkObjectResult(product);
}

---

// TIMER TRIGGER - Run on schedule
[FunctionName("CleanupOldData")]
public static async Task CleanupOldData(
    [TimerTrigger("0 0 2 * * *")] TimerInfo timer,  // 2 AM daily
    ILogger log)
{
    log.LogInformation("Starting cleanup job");
    await _cleanupService.DeleteOldRecordsAsync();
}

---

// QUEUE TRIGGER - Process messages from queue
[FunctionName("ProcessOrder")]
public static async Task ProcessOrder(
    [QueueTrigger("orders")] Order order,
    ILogger log)
{
    log.LogInformation($"Processing order {order.Id}");
    await _orderService.ProcessAsync(order);
}

---

// BLOB TRIGGER - Process uploaded files
[FunctionName("ProcessImage")]
public static async Task ProcessImage(
    [BlobTrigger("uploads/{name}")] Stream image,
    string name,
    ILogger log)
{
    log.LogInformation($"Processing image: {name}");
    var resized = await _imageService.ResizeAsync(image);
    // Save resized image
}

---

WHEN TO USE FUNCTIONS
─────────────────────
✅ Event-driven tasks (file uploaded, message received)
✅ Scheduled jobs (cleanup, reports, backups)
✅ Webhooks and API integrations
✅ Microservices architecture
✅ Background processing
✅ Cost-sensitive workloads (pay per execution)

WHEN NOT TO USE
───────────────
❌ Long-running processes (5-10 min limit on consumption plan)
❌ Applications requiring persistent state
❌ Real-time WebSocket connections
❌ CPU-intensive operations for extended periods

PRICING
───────
Consumption Plan:
- First 1 million executions FREE
- $0.20 per million executions
- $0.000016 per GB-second
- Perfect for: Occasional tasks, low traffic

Premium Plan: ~$150/month
- Pre-warmed instances (no cold start)
- VNet integration
- Unlimited execution time
- Perfect for: Production microservices

WHAT IS AZURE SQL?
──────────────────
Managed SQL Server with:
✅ Automatic backups (point-in-time restore)
✅ Automatic updates and patching
✅ Built-in high availability (99.99% SLA)
✅ Intelligent performance tuning
✅ Advanced security features
✅ Geo-replication for disaster recovery

---

CONNECTION STRING
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// appsettings.json
{
  "ConnectionStrings": {
    "DefaultConnection": "Server=tcp:myserver.database.windows.net,1433;
                         Database=mydb;
                         User ID=admin;
                         Password=SecurePassword123;
                         Encrypt=True;
                         TrustServerCertificate=False;"
  }
}

// Program.cs
builder.Services.AddDbContext(options =>
    options.UseSqlServer(
        builder.Configuration.GetConnectionString("DefaultConnection")));

---

DEPLOYMENT OPTIONS
──────────────────
1. Single Database
   - One database, dedicated resources
   - Best for: Most applications

2. Elastic Pool
   - Share resources across multiple databases
   - Best for: SaaS with many customer databases

3. Managed Instance
   - Nearly 100% SQL Server compatibility
   - Best for: Migrating existing SQL Server

---

PRICING
───────
Basic: ~$5/month
- 2 GB storage
- Good for: Development, testing

Standard S0: ~$15/month
- 250 GB storage
- 10 DTUs (Database Transaction Units)
- Good for: Small production apps

Premium P1: ~$465/month
- 500 GB storage
- 125 DTUs
- Good for: High-performance apps

Serverless (Auto-scaling): $0.50/vCore-hour
- Scales automatically based on load
- Pauses when inactive
- Good for: Intermittent workloads

---

SECURITY FEATURES
─────────────────
- Firewall rules (IP whitelist)
- Virtual Network integration
- Transparent Data Encryption (TDE)
- Always Encrypted (sensitive data)
- Advanced Threat Protection
- Auditing and compliance

METHOD 1: VISUAL STUDIO (EASIEST)
──────────────────────────────────
1. Right-click project → Publish
2. Select "Azure"
3. Choose "Azure App Service (Windows)"
4. Sign in to Azure
5. Create new or select existing App Service
6. Click "Publish"

Done! Your app is live.

---

METHOD 2: AZURE CLI
───────────────────
# Login to Azure
az login

# Create resource group
az group create --name myResourceGroup --location eastus

# Create App Service plan
az appservice plan create --name myPlan --resource-group myResourceGroup --sku B1

# Create web app
az webapp create --name myUniqueAppName --resource-group myResourceGroup --plan myPlan

# Deploy from local folder
az webapp up --name myUniqueAppName --resource-group myResourceGroup

---

METHOD 3: GITHUB ACTIONS (CI/CD)
─────────────────────────────────
# .github/workflows/azure-deploy.yml
name: Deploy to Azure

on:
  push:
    branches: [ main ]

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2

    - name: Setup .NET
      uses: actions/setup-dotnet@v1
      with:
        dotnet-version: '8.0.x'

    - name: Build
      run: dotnet build --configuration Release

    - name: Publish
      run: dotnet publish -c Release -o ${{env.DOTNET_ROOT}}/myapp

    - name: Deploy to Azure
      uses: azure/webapps-deploy@v2
      with:
        app-name: 'myUniqueAppName'
        publish-profile: ${{ secrets.AZURE_WEBAPP_PUBLISH_PROFILE }}
        package: ${{env.DOTNET_ROOT}}/myapp

---

METHOD 4: DOCKER CONTAINER
──────────────────────────
# Dockerfile
FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
WORKDIR /app
EXPOSE 80

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
WORKDIR /src
COPY ["MyApp.csproj", "./"]
RUN dotnet restore "MyApp.csproj"
COPY . .
RUN dotnet build "MyApp.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "MyApp.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "MyApp.dll"]

# Build and push
docker build -t myapp .
docker tag myapp myregistry.azurecr.io/myapp:latest
docker push myregistry.azurecr.io/myapp:latest

# Deploy to App Service
az webapp create --name myapp --resource-group mygroup --plan myplan --deployment-container-image-name myregistry.azurecr.io/myapp:latest

AZURE BLOB STORAGE
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Store files (images, documents, backups)

Use cases:
- User profile pictures
- Document uploads
- Application logs
- Static website hosting

Pricing: ~$0.018/GB per month

// C# Code
var blobServiceClient = new BlobServiceClient(connectionString);
var containerClient = blobServiceClient.GetBlobContainerClient("uploads");
var blobClient = containerClient.GetBlobClient("photo.jpg");
await blobClient.UploadAsync(fileStream);

---

AZURE KEY VAULT
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Securely store secrets, keys, certificates

Use cases:
- Database connection strings
- API keys
- Encryption keys
- SSL certificates

// C# Code
var client = new SecretClient(new Uri(keyVaultUrl), new DefaultAzureCredential());
var secret = await client.GetSecretAsync("DatabasePassword");
var password = secret.Value.Value;

---

AZURE SERVICE BUS
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Enterprise message queue

Use cases:
- Microservices communication
- Decouple applications
- Guaranteed message delivery
- Publish/Subscribe patterns

Pricing: ~$0.05 per million operations

---

AZURE REDIS CACHE
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In-memory cache for performance

Use cases:
- Session state
- Frequently accessed data
- Reduce database load

// C# Code
var redis = ConnectionMultiplexer.Connect(connectionString);
var db = redis.GetDatabase();
await db.StringSetAsync("user:123", userJson);
var cached = await db.StringGetAsync("user:123");

---

AZURE APPLICATION INSIGHTS
───────────────────────────
Application monitoring and analytics

Features:
- Live metrics dashboard
- Request tracking
- Exception logging
- Performance monitoring
- Custom events and metrics

// Automatic in ASP.NET Core
builder.Services.AddApplicationInsightsTelemetry();

PATTERN 1: SIMPLE WEB APP
─────────────────────────
┌─────────────────┐
│  Azure App      │
│  Service        │──► Azure SQL Database
│  (ASP.NET Core) │
└─────────────────┘
        │
        ▼
   Azure Blob Storage

Cost: ~$30-100/month
Good for: Small to medium apps

---

PATTERN 2: MICROSERVICES
────────────────────────
                  ┌─────────────┐
                  │ Azure API   │
                  │ Management  │
                  └──────┬──────┘
                         │
          ┌──────────────┼──────────────┐
          ▼              ▼              ▼
    ┌─────────┐    ┌─────────┐    ┌─────────┐
    │Function │    │Function │    │Function │
    │Service A│    │Service B│    │Service C│
    └────┬────┘    └────┬────┘    └────┬────┘
         │              │              │
         ▼              ▼              ▼
    Azure SQL    Service Bus    Cosmos DB

Cost: ~$200-500/month
Good for: Scalable, distributed systems

---

PATTERN 3: SERVERLESS
─────────────────────
Event Grid ──► Azure Functions ──► Cosmos DB
                      │
                      ▼
              Storage Queue ──► Azure Functions ──► SendGrid

Cost: ~$10-50/month (pay per use)
Good for: Event-driven, low-traffic apps

---

PATTERN 4: ENTERPRISE
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                   Azure Front Door
                          │
          ┌───────────────┼───────────────┐
          ▼               ▼               ▼
   App Service 1   App Service 2   App Service 3
   (West US)      (East US)       (Europe)
          │               │               │
          └───────────────┼───────────────┘
                          ▼
                  Azure SQL (Geo-Replicated)
                          │
                  ┌───────┴────────┐
                  ▼                ▼
           Azure Cache      Application
           for Redis        Insights

Cost: ~$1,000+/month
Good for: Global, high-availability apps