CI/CD Maintainability

This document outlines the continuous integration and deployment strategies designed to ensure high maintainability, automated quality gates, and reliable delivery pipelines.

Pipeline Architecture

graph LR
    A[Code Push] --> B[Build]
    B --> C[Unit Tests]
    C --> D[Integration Tests]
    D --> E[Code Quality]
    E --> F[Security Scan]
    F --> G[Package]
    G --> H[Deploy Dev]
    H --> I[Deploy Staging]
    I --> J[Deploy Production]

GitHub Actions Workflow

Main CI/CD Pipeline

# .github/workflows/ci-cd.yml
name: CI/CD Pipeline

on:
  push:
    branches: [ main, develop, solid-refactoring ]
  pull_request:
    branches: [ main ]

env:
  DOTNET_VERSION: '8.0'
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  test:
    name: Run Tests
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Setup .NET
      uses: actions/setup-dotnet@v4
      with:
        dotnet-version: ${{ env.DOTNET_VERSION }}
        
    - name: Restore dependencies
      run: dotnet restore
      
    - name: Build
      run: dotnet build --configuration Release --no-restore
      
    - name: Test
      run: |
        dotnet test --configuration Release --no-build \
          --verbosity normal \
          --collect:"XPlat Code Coverage" \
          --results-directory ./coverage
      
    - name: Code Coverage
      uses: codecov/codecov-action@v3
      with:
        directory: ./coverage
        fail_ci_if_error: true
        verbose: true

  security:
    name: Security Scan
    runs-on: ubuntu-latest
    needs: test
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Run Trivy vulnerability scanner
      uses: aquasecurity/trivy-action@master
      with:
        scan-type: 'fs'
        scan-ref: '.'
        format: 'sarif'
        output: 'trivy-results.sarif'
        
    - name: Upload Trivy scan results to GitHub Security tab
      uses: github/codeql-action/upload-sarif@v2
      with:
        sarif_file: 'trivy-results.sarif'

  quality:
    name: Code Quality
    runs-on: ubuntu-latest
    needs: test
    
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0
        
    - name: SonarCloud Scan
      uses: SonarSource/sonarcloud-github-action@master
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

  build-and-push:
    name: Build and Push Docker Image
    runs-on: ubuntu-latest
    needs: [test, security, quality]
    if: github.ref == 'refs/heads/main'
    
    outputs:
      image: ${{ steps.image.outputs.image }}
      digest: ${{ steps.build.outputs.digest }}
    
    steps:
    - name: Checkout
      uses: actions/checkout@v4
      
    - name: Log in to Container Registry
      uses: docker/login-action@v3
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}
        
    - name: Extract metadata
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
        tags: |
          type=ref,event=branch
          type=ref,event=pr
          type=sha,prefix={{branch}}-
          type=raw,value=latest,enable={{is_default_branch}}
          
    - name: Build and push
      id: build
      uses: docker/build-push-action@v5
      with:
        context: .
        push: true
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        cache-from: type=gha
        cache-to: type=gha,mode=max

  deploy-dev:
    name: Deploy to Development
    runs-on: ubuntu-latest
    needs: build-and-push
    environment: development
    
    steps:
    - name: Deploy to Dev Environment
      run: |
        echo "Deploying to development environment"
        # kubectl set image deployment/mcp-server mcp-server=${{ needs.build-and-push.outputs.image }}
        
  deploy-staging:
    name: Deploy to Staging
    runs-on: ubuntu-latest
    needs: [build-and-push, deploy-dev]
    environment: staging
    
    steps:
    - name: Deploy to Staging Environment
      run: |
        echo "Deploying to staging environment"
        # kubectl set image deployment/mcp-server mcp-server=${{ needs.build-and-push.outputs.image }}

  deploy-production:
    name: Deploy to Production
    runs-on: ubuntu-latest
    needs: [build-and-push, deploy-staging]
    environment: production
    if: github.ref == 'refs/heads/main'
    
    steps:
    - name: Deploy to Production Environment
      run: |
        echo "Deploying to production environment"
        # kubectl set image deployment/mcp-server mcp-server=${{ needs.build-and-push.outputs.image }}

Quality Gates

Code Coverage Requirements

# .github/workflows/quality-gates.yml
name: Quality Gates

on:
  pull_request:
    branches: [ main ]

jobs:
  coverage-check:
    name: Coverage Requirements
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Setup .NET
      uses: actions/setup-dotnet@v4
      with:
        dotnet-version: '8.0'
        
    - name: Run tests with coverage
      run: |
        dotnet test --collect:"XPlat Code Coverage" \
          --results-directory ./coverage \
          /p:CoverletOutputFormat=cobertura \
          /p:Threshold=80 \
          /p:ThresholdType=line \
          /p:ThresholdStat=minimum
          
    - name: Fail if coverage below 80%
      run: |
        coverage=$(grep -oP 'line-rate="\K[^"]*' ./coverage/coverage.cobertura.xml | awk '{print $1*100}')
        if (( $(echo "$coverage < 80" | bc -l) )); then
          echo "Coverage $coverage% is below required 80%"
          exit 1
        fi

Static Analysis

name: Static Analysis

on: [push, pull_request]

jobs:
  analyze:
    name: Analyze Code
    runs-on: ubuntu-latest
    
    strategy:
      fail-fast: false
      matrix:
        language: [ 'csharp' ]
        
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4
      
    - name: Initialize CodeQL
      uses: github/codeql-action/init@v2
      with:
        languages: ${{ matrix.language }}
        
    - name: Setup .NET
      uses: actions/setup-dotnet@v4
      with:
        dotnet-version: '8.0'
        
    - name: Build
      run: dotnet build --configuration Release
      
    - name: Perform CodeQL Analysis
      uses: github/codeql-action/analyze@v2

Deployment Strategies

Blue-Green Deployment

#!/bin/bash
# scripts/deploy-blue-green.sh

set -e

ENVIRONMENT=${1:-staging}
VERSION=${2:-latest}
NAMESPACE="mcp-server-${ENVIRONMENT}"

echo "Starting blue-green deployment for ${ENVIRONMENT} environment"

# Check current active deployment
CURRENT_ACTIVE=$(kubectl get service mcp-server-active -n $NAMESPACE -o jsonpath='{.spec.selector.version}' 2>/dev/null || echo "blue")
NEW_ACTIVE=$([ "$CURRENT_ACTIVE" = "blue" ] && echo "green" || echo "blue")

echo "Current active: $CURRENT_ACTIVE, Deploying to: $NEW_ACTIVE"

# Deploy to inactive environment
kubectl set image deployment/mcp-server-$NEW_ACTIVE \
  mcp-server=ghcr.io/yourorg/mcp-server:$VERSION \
  -n $NAMESPACE

# Wait for rollout to complete
kubectl rollout status deployment/mcp-server-$NEW_ACTIVE -n $NAMESPACE

# Health check
echo "Performing health checks..."
kubectl port-forward service/mcp-server-$NEW_ACTIVE 8080:8080 -n $NAMESPACE &
PORT_FORWARD_PID=$!

sleep 5

if curl -f http://localhost:8080/health; then
  echo "Health check passed"
  
  # Switch traffic
  kubectl patch service mcp-server-active \
    -p '{"spec":{"selector":{"version":"'$NEW_ACTIVE'"}}}' \
    -n $NAMESPACE
    
  echo "Traffic switched to $NEW_ACTIVE"
else
  echo "Health check failed, rolling back"
  exit 1
fi

# Cleanup
kill $PORT_FORWARD_PID 2>/dev/null || true

Rolling Updates

# k8s/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mcp-server
spec:
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  selector:
    matchLabels:
      app: mcp-server
  template:
    metadata:
      labels:
        app: mcp-server
    spec:
      containers:
      - name: mcp-server
        image: ghcr.io/yourorg/mcp-server:latest
        ports:
        - containerPort: 8080
        readinessProbe:
          httpGet:
            path: /health/ready
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 5
        livenessProbe:
          httpGet:
            path: /health/live
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10

Automated Testing Integration

Test Execution Strategy

# .github/workflows/test-strategy.yml
name: Comprehensive Testing

on: [push, pull_request]

jobs:
  unit-tests:
    name: Unit Tests
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Setup .NET
      uses: actions/setup-dotnet@v4
      with:
        dotnet-version: '8.0'
        
    - name: Run Unit Tests
      run: |
        dotnet test SampleMcpServer.Tests \
          --filter "Category!=Integration" \
          --logger trx \
          --collect:"XPlat Code Coverage"
          
    - name: Publish Test Results
      uses: dorny/test-reporter@v1
      if: success() || failure()
      with:
        name: Unit Test Results
        path: '**/*.trx'
        reporter: dotnet-trx

  integration-tests:
    name: Integration Tests
    runs-on: ubuntu-latest
    needs: unit-tests
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Setup .NET
      uses: actions/setup-dotnet@v4
      with:
        dotnet-version: '8.0'
        
    - name: Run Integration Tests
      run: |
        dotnet test SampleMcpServer.Tests \
          --filter "Category=Integration" \
          --logger trx
          
    - name: Publish Integration Test Results
      uses: dorny/test-reporter@v1
      if: success() || failure()
      with:
        name: Integration Test Results
        path: '**/*.trx'
        reporter: dotnet-trx

  smoke-tests:
    name: Smoke Tests
    runs-on: ubuntu-latest
    needs: [unit-tests, integration-tests]
    
    services:
      mcp-server:
        image: mcr.microsoft.com/dotnet/sdk:8.0
        ports:
          - 8080:8080
        options: >-
          --health-cmd "curl -f http://localhost:8080/health || exit 1"
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Run Smoke Tests
      run: |
        # Test basic functionality
        curl -f http://localhost:8080/health
        # Add more smoke tests here

Environment Management

Environment Configuration

# .github/environments/development.yml
name: development
url: https://dev.mcp-server.com
protection_rules:
  - type: required_reviewers
    required_reviewers:
      users: ["dev-team"]
  - type: wait_timer
    wait_timer: 0

# .github/environments/staging.yml  
name: staging
url: https://staging.mcp-server.com
protection_rules:
  - type: required_reviewers
    required_reviewers:
      users: ["qa-team", "dev-lead"]
  - type: wait_timer
    wait_timer: 5

# .github/environments/production.yml
name: production
url: https://mcp-server.com
protection_rules:
  - type: required_reviewers
    required_reviewers:
      users: ["devops-team", "security-team"]
      required_reviewer_count: 2
  - type: wait_timer
    wait_timer: 30

Infrastructure as Code

# terraform/environments/production/main.tf
terraform {
  required_version = ">= 1.0"
  
  backend "s3" {
    bucket = "mcp-server-terraform-state"
    key    = "production/terraform.tfstate"
    region = "us-west-2"
  }
  
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.0"
    }
  }
}

module "mcp_server" {
  source = "../../modules/mcp-server"
  
  environment    = "production"
  instance_count = 3
  instance_type  = "t3.medium"
  
  # Security
  enable_waf           = true
  enable_ssl           = true
  certificate_arn      = var.ssl_certificate_arn
  
  # Monitoring
  enable_cloudwatch    = true
  log_retention_days   = 30
  
  # Networking
  vpc_id     = var.vpc_id
  subnet_ids = var.private_subnet_ids
  
  tags = {
    Environment = "production"
    Project     = "mcp-server"
    Team        = "platform"
  }
}

Monitoring and Alerting

Application Metrics

# k8s/monitoring.yaml
apiVersion: v1
kind: ServiceMonitor
metadata:
  name: mcp-server-metrics
spec:
  selector:
    matchLabels:
      app: mcp-server
  endpoints:
  - port: metrics
    interval: 30s
    path: /metrics

---
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: mcp-server-alerts
spec:
  groups:
  - name: mcp-server
    rules:
    - alert: HighErrorRate
      expr: rate(http_requests_total{status=~"5.."}[5m]) > 0.1
      for: 5m
      annotations:
        summary: "High error rate detected"
        
    - alert: HighMemoryUsage
      expr: container_memory_usage_bytes / container_spec_memory_limit_bytes > 0.8
      for: 5m
      annotations:
        summary: "High memory usage detected"

Deployment Notifications

# .github/workflows/notifications.yml
name: Deployment Notifications

on:
  workflow_run:
    workflows: ["CI/CD Pipeline"]
    types: [completed]

jobs:
  notify:
    runs-on: ubuntu-latest
    
    steps:
    - name: Notify Slack on Success
      if: ${{ github.event.workflow_run.conclusion == 'success' }}
      uses: 8398a7/action-slack@v3
      with:
        status: success
        text: "✅ Deployment successful to production"
        webhook_url: ${{ secrets.SLACK_WEBHOOK }}
        
    - name: Notify Slack on Failure
      if: ${{ github.event.workflow_run.conclusion == 'failure' }}
      uses: 8398a7/action-slack@v3
      with:
        status: failure
        text: "❌ Deployment failed - immediate attention required"
        webhook_url: ${{ secrets.SLACK_WEBHOOK }}

Maintenance Automation

Dependency Updates

# .github/dependabot.yml
version: 2
updates:
  - package-ecosystem: "nuget"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 5
    reviewers:
      - "dev-team"
    commit-message:
      prefix: "chore"
      include: "scope"

  - package-ecosystem: "docker"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 5

Automated Security Updates

# .github/workflows/security-updates.yml
name: Security Updates

on:
  schedule:
    - cron: '0 6 * * MON'  # Weekly on Monday at 6 AM

jobs:
  security-audit:
    name: Security Audit
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Setup .NET
      uses: actions/setup-dotnet@v4
      with:
        dotnet-version: '8.0'
        
    - name: Run security audit
      run: |
        dotnet list package --vulnerable --include-transitive
        
    - name: Create security issue
      if: failure()
      uses: actions/github-script@v6
      with:
        script: |
          github.rest.issues.create({
            owner: context.repo.owner,
            repo: context.repo.repo,
            title: 'Security vulnerabilities detected',
            body: 'Automated security scan found vulnerabilities. Please review and update dependencies.',
            labels: ['security', 'priority-high']
          })

Next Steps

Review Production-Ready Settings for deployment configuration
Explore System Architecture for design details
Check Testing Integration for quality assurance processes