Maintenance & Updates

Keep your application secure and up-to-date with regular maintenance procedures.

Maintenance & Updates

Regular Maintenance Schedule

Daily Tasks

  • Monitor application logs for errors
  • Check system resource usage
  • Verify backup completion
  • Review security alerts

Weekly Tasks

  • Update dependencies with security patches
  • Analyze performance metrics
  • Review database performance
  • Test backup restoration

Monthly Tasks

  • Security audit and vulnerability assessment
  • Performance optimization review
  • Capacity planning assessment
  • Documentation updates

Dependency Management

Security Updates

Keep dependencies secure with regular updates.

# Check for security vulnerabilities
npm audit

# Fix vulnerabilities automatically
npm audit fix

# Update specific packages
npm update package-name

# Check for outdated packages
npm outdated

Automated Dependency Updates

Set up automated dependency updates with Dependabot.

# .github/dependabot.yml
version: 2
updates:
  - package-ecosystem: "npm"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 10
    reviewers:
      - "your-username"
    assignees:
      - "your-username"
    commit-message:
      prefix: "chore"
      include: "scope"

Dependency Audit

Regular security auditing of dependencies.

// scripts/audit-dependencies.ts
import { execSync } from 'child_process'
import fs from 'fs'

interface AuditResult {
  vulnerabilities: {
    [key: string]: {
      severity: string
      title: string
      url: string
    }
  }
}

export async function auditDependencies(): Promise<void> {
  try {
    const auditOutput = execSync('npm audit --json', { encoding: 'utf8' })
    const audit: AuditResult = JSON.parse(auditOutput)
    
    const highSeverityVulns = Object.entries(audit.vulnerabilities)
      .filter(([_, vuln]) => ['high', 'critical'].includes(vuln.severity))
    
    if (highSeverityVulns.length > 0) {
      console.error('High severity vulnerabilities found:')
      highSeverityVulns.forEach(([name, vuln]) => {
        console.error(`- ${name}: ${vuln.title} (${vuln.severity})`)
        console.error(`  URL: ${vuln.url}`)
      })
      
      // Send alert
      await sendSecurityAlert(highSeverityVulns)
    }
  } catch (error) {
    console.error('Dependency audit failed:', error)
  }
}

async function sendSecurityAlert(vulnerabilities: any[]): Promise<void> {
  // Implementation for sending security alerts
  console.log('Security alert sent for vulnerabilities:', vulnerabilities.length)
}

Application Updates

Zero-Downtime Deployment

Implement rolling updates for zero-downtime deployments.

# docker-compose.yml - Rolling update strategy
version: '3.8'
services:
  app:
    image: your-app:${APP_VERSION}
    deploy:
      replicas: 3
      update_config:
        parallelism: 1
        delay: 30s
        failure_action: rollback
        monitor: 120s
        order: start-first
      rollback_config:
        parallelism: 1
        delay: 30s
        failure_action: pause
        monitor: 120s
        order: stop-first
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:3000/health"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 60s

Blue-Green Deployment

Switch between production environments for safe updates.

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

CURRENT_ENV=$(cat /var/www/current-env)
NEW_ENV="blue"

if [ "$CURRENT_ENV" = "blue" ]; then
    NEW_ENV="green"
fi

echo "Deploying to $NEW_ENV environment..."

# Deploy to new environment
docker-compose -f docker-compose.$NEW_ENV.yml up -d

# Wait for health check
sleep 30

# Check if new environment is healthy
if curl -f http://localhost:8080/health; then
    echo "Health check passed. Switching traffic..."
    
    # Update load balancer to point to new environment
    sed -i "s/server app-$CURRENT_ENV/server app-$NEW_ENV/" /etc/nginx/sites-available/default
    nginx -s reload
    
    # Update current environment marker
    echo $NEW_ENV > /var/www/current-env
    
    # Stop old environment
    docker-compose -f docker-compose.$CURRENT_ENV.yml down
    
    echo "Deployment completed successfully!"
else
    echo "Health check failed. Rolling back..."
    docker-compose -f docker-compose.$NEW_ENV.yml down
    exit 1
fi

Database Maintenance

Database Updates

Manage database schema changes safely.

// lib/database-migration.ts
export class DatabaseMigrator {
  private migrations: Migration[] = []
  
  addMigration(migration: Migration): void {
    this.migrations.push(migration)
  }
  
  async runMigrations(): Promise<void> {
    for (const migration of this.migrations) {
      try {
        console.log(`Running migration: ${migration.name}`)
        await migration.up()
        await this.recordMigration(migration)
        console.log(`Migration completed: ${migration.name}`)
      } catch (error) {
        console.error(`Migration failed: ${migration.name}`, error)
        await migration.down()
        throw error
      }
    }
  }
  
  private async recordMigration(migration: Migration): Promise<void> {
    // Record migration in database
    const query = `
      INSERT INTO schema_migrations (name, executed_at)
      VALUES ($1, $2)
    `
    await db.query(query, [migration.name, new Date()])
  }
}

interface Migration {
  name: string
  up(): Promise<void>
  down(): Promise<void>
}

Database Optimization

Regular database maintenance tasks.

-- PostgreSQL maintenance queries

-- Analyze table statistics
ANALYZE;

-- Vacuum dead tuples
VACUUM;

-- Full vacuum (requires exclusive lock)
VACUUM FULL;

-- Reindex tables
REINDEX DATABASE your_database;

-- Check for bloated tables
SELECT 
    schemaname,
    tablename,
    n_dead_tup,
    n_live_tup,
    round((n_dead_tup::float / (n_live_tup + n_dead_tup)) * 100, 2) as dead_ratio
FROM pg_stat_user_tables
WHERE n_dead_tup > 0
ORDER BY dead_ratio DESC;

Security Maintenance

SSL Certificate Renewal

Automate SSL certificate renewal.

#!/bin/bash
# ssl-renewal.sh

# Check certificate expiration
CERT_FILE="/etc/ssl/certs/example.com.crt"
EXPIRE_DATE=$(openssl x509 -enddate -noout -in $CERT_FILE | cut -d= -f2)
EXPIRE_TIMESTAMP=$(date -d "$EXPIRE_DATE" +%s)
CURRENT_TIMESTAMP=$(date +%s)
DAYS_UNTIL_EXPIRE=$(( ($EXPIRE_TIMESTAMP - $CURRENT_TIMESTAMP) / 86400 ))

if [ $DAYS_UNTIL_EXPIRE -lt 30 ]; then
    echo "Certificate expires in $DAYS_UNTIL_EXPIRE days. Renewing..."
    
    # Renew certificate (Let's Encrypt example)
    certbot renew --quiet
    
    # Reload nginx
    systemctl reload nginx
    
    echo "Certificate renewed successfully!"
else
    echo "Certificate is valid for $DAYS_UNTIL_EXPIRE more days."
fi

Security Scanning

Regular security scans and assessments.

#!/bin/bash
# security-scan.sh

echo "Running security scan..."

# Scan for vulnerabilities
nmap -sS -sV localhost

# Check for exposed services
netstat -tuln

# Scan application dependencies
npm audit

# Check file permissions
find /var/www -type f -perm 777 -ls

# Check for suspicious processes
ps aux | grep -E "(nc|netcat|wget|curl)" | grep -v grep

echo "Security scan completed."

Monitoring & Alerting

Health Checks

Implement comprehensive health monitoring.

// lib/health-check.ts
export interface HealthCheck {
  name: string
  check(): Promise<boolean>
}

export class HealthMonitor {
  private checks: HealthCheck[] = []
  
  addCheck(check: HealthCheck): void {
    this.checks.push(check)
  }
  
  async runHealthChecks(): Promise<{ healthy: boolean; results: any[] }> {
    const results = []
    let healthy = true
    
    for (const check of this.checks) {
      try {
        const result = await check.check()
        results.push({
          name: check.name,
          status: result ? 'healthy' : 'unhealthy',
          timestamp: new Date(),
        })
        
        if (!result) {
          healthy = false
        }
      } catch (error) {
        results.push({
          name: check.name,
          status: 'error',
          error: error.message,
          timestamp: new Date(),
        })
        healthy = false
      }
    }
    
    return { healthy, results }
  }
}

// Database health check
export const databaseHealthCheck: HealthCheck = {
  name: 'database',
  async check(): Promise<boolean> {
    try {
      await db.query('SELECT 1')
      return true
    } catch {
      return false
    }
  }
}

// External API health check
export const apiHealthCheck: HealthCheck = {
  name: 'external-api',
  async check(): Promise<boolean> {
    try {
      const response = await fetch('https://api.example.com/health')
      return response.ok
    } catch {
      return false
    }
  }
}

Automated Maintenance

Schedule automated maintenance tasks.

# crontab entries for automated maintenance

# Daily tasks
0 2 * * * /usr/local/bin/backup-database.sh
0 3 * * * /usr/local/bin/clean-logs.sh
0 4 * * * /usr/local/bin/health-check.sh

# Weekly tasks
0 1 * * 0 /usr/local/bin/update-dependencies.sh
0 2 * * 0 /usr/local/bin/security-scan.sh

# Monthly tasks
0 1 1 * * /usr/local/bin/ssl-renewal.sh
0 2 1 * * /usr/local/bin/database-vacuum.sh

Maintain your application's security, performance, and stability with regular maintenance procedures and automated updates.