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maintenance

Maintenance Procedures Guide

This comprehensive guide covers all maintenance procedures for the HostingCo system, including routine maintenance, system updates, performance optimization, and preventive care.

Maintenance Overview

The HostingCo system requires regular maintenance to ensure optimal performance, security, and reliability. This guide provides detailed procedures for all maintenance activities.

Maintenance Categories

Routine Maintenance - Daily, weekly, and monthly tasks
System Updates - Software patches and version upgrades
Performance Optimization - Database and application tuning
Security Maintenance - Security updates and vulnerability patches
Backup Maintenance - Backup verification and restoration testing
Monitoring Maintenance - Alert system and monitoring tool upkeep

Automated Maintenance Scripts

The project includes comprehensive automation scripts for all maintenance operations:

# Health monitoring and checks
./scripts/health-check.sh --detailed --watch

# System cleanup and maintenance
./scripts/clean.sh --deep --cache --logs

# Database maintenance
./scripts/db-migrate.sh production
./scripts/db-reset.sh development --force

# Docker maintenance
./scripts/docker-down.sh --volumes --remove-orphans
./scripts/docker-build.sh production --no-cache

# Complete system maintenance
./scripts/maintenance.sh --all --backup

For complete maintenance script documentation, see Automation Scripts.

📅 Routine Maintenance Schedule

Daily Maintenance Tasks

System Health Checks

# Use automated health check script (recommended)
./scripts/health-check.sh --detailed

# Or use manual health check:
#!/bin/bash
# daily-health-check.sh

echo "=== Daily Health Check - $(date) ==="

# Check service status
echo "1. Checking service status..."
systemctl is-active postgresql && echo "PostgreSQL: Active" || echo "PostgreSQL: Inactive"
systemctl is-active redis && echo "Redis: Active" || echo "Redis: Inactive"
systemctl is-active nginx && echo "Nginx: Active" || echo "Nginx: Inactive"

# Check application health
echo "2. Checking application health..."
curl -s http://localhost:3003/api/health > /dev/null && echo "Backend API: Healthy" || echo "Backend API: Unhealthy"
curl -s http://localhost:3000 > /dev/null && echo "Frontend: Healthy" || echo "Frontend: Unhealthy"

# Check disk space
echo "3. Checking disk space..."
df -h | grep -E "/(var|home)" | while read line; do
  usage=$(echo $line | awk '{print $5}' | sed 's/%//')
  if [ $usage -gt 80 ]; then
    echo "High disk usage: $line"
  else
    echo "Disk usage OK: $line"
  fi
done

# Check memory usage
echo "4. Checking memory usage..."
memory_usage=$(free | grep Mem | awk '{printf("%.1f", $3/$2 * 100.0)}')
if (( $(echo "$memory_usage > 80" | bc -l) )); then
  echo "High memory usage: ${memory_usage}%"
else
  echo "Memory usage OK: ${memory_usage}%"
fi

# Check database connections
echo "5. Checking database connections..."
db_connections=$(psql -h localhost -U hostingco -d hostingco -t -c "SELECT count(*) FROM pg_stat_activity;" | tr -d ' ')
if [ $db_connections -gt 80 ]; then
  echo "High database connections: $db_connections"
else
  echo "Database connections OK: $db_connections"
fi

# Check error logs
echo "6. Checking for recent errors..."
error_count=$(tail -1000 /var/log/hostingco/backend/error.log | grep -i error | wc -l)
if [ $error_count -gt 10 ]; then
  echo "High error count: $error_count errors in last 1000 lines"
else
  echo "Error count OK: $error_count errors in last 1000 lines"
fi

echo "=== Daily Health Check Complete ==="

Log Rotation and Cleanup

#!/bin/bash
# log-maintenance.sh

echo "=== Log Maintenance - $(date) ==="

# Rotate application logs
echo "1. Rotating application logs..."
logrotate -f /etc/logrotate.d/hostingco

# Clean old logs (keep 30 days)
echo "2. Cleaning old logs..."
find /var/log/hostingco -name "*.log" -mtime +30 -delete
find /var/log/hostingco -name "*.log.*" -mtime +30 -delete

# Clean temporary files
echo "3. Cleaning temporary files..."
find /tmp -name "hostingco_*" -mtime +1 -delete

# Clean uploaded files cache
echo "4. Cleaning upload cache..."
find /var/www/hostingco/uploads/cache -mtime +7 -delete

# Compress large log files
echo "5. Compressing large log files..."
find /var/log/hostingco -name "*.log" -size +100M -exec gzip {} \;

echo "=== Log Maintenance Complete ==="

Database Maintenance

#!/bin/bash
# database-maintenance.sh

echo "=== Database Maintenance - $(date) ==="

# Update database statistics
echo "1. Updating database statistics..."
psql -h localhost -U hostingco -d hostingco -c "ANALYZE;"

# Check for long-running queries
echo "2. Checking for long-running queries..."
long_queries=$(psql -h localhost -U hostingco -d hostingco -t -c "
SELECT query, now() - pg_stat_activity.query_start AS duration, pid 
FROM pg_stat_activity 
WHERE (now() - pg_stat_activity.query_start) > interval '5 minutes'
AND state = 'active';
")

if [ ! -z "$long_queries" ]; then
  echo "Long-running queries found:"
  echo "$long_queries"
else
  echo "No long-running queries"
fi

# Check database size
echo "3. Checking database size..."
db_size=$(psql -h localhost -U hostingco -d hostingco -t -c "SELECT pg_size_pretty(pg_database_size('hostingco'));")
echo "Database size: $db_size"

# Check table sizes
echo "4. Checking table sizes..."
psql -h localhost -U hostingco -d hostingco -c "
SELECT schemaname, tablename, 
       pg_size_pretty(pg_total_relation_size(schemaname||'.'||tablename)) as size
FROM pg_tables 
WHERE schemaname = 'public'
ORDER BY pg_total_relation_size(schemaname||'.'||tablename) DESC
LIMIT 10;

echo "=== Database Maintenance Complete ==="

Weekly Maintenance Tasks

System Performance Review

#!/bin/bash
# weekly-performance-review.sh

echo "=== Weekly Performance Review - $(date) ==="

# Generate performance report
echo "1. Generating performance report..."

# CPU usage over the week
echo "CPU Usage (7 days):"
sar -u | grep -E "Average|all" | tail -1

# Memory usage over the week
echo "Memory Usage (7 days):"
sar -r | grep -E "Average|kbmemfree" | tail -1

# Disk I/O over the week
echo "Disk I/O (7 days):"
sar -d | grep -E "Average|dev" | tail -5

# Network statistics
echo "Network Statistics:"
cat /proc/net/dev | grep -E "(eth|en|wl)" | head -3

# Application response times
echo "Application Response Times:"
curl -w "@curl-format.txt" -o /dev/null -s http://localhost:3003/api/health

# Database performance
echo "Database Performance:"
psql -h localhost -U hostingco -d hostingco -c "
SELECT 
  (SELECT count(*) FROM pg_stat_activity WHERE state = 'active') as active_connections,
  (SELECT count(*) FROM pg_stat_activity WHERE state = 'idle') as idle_connections,
  (SELECT count(*) FROM pg_stat_activity WHERE state = 'idle in transaction') as idle_in_transaction;
"

echo "=== Weekly Performance Review Complete ==="

Security Updates Check

#!/bin/bash
# security-updates-check.sh

echo "=== Security Updates Check - $(date) ==="

# Check for system updates
echo "1. Checking for system updates..."
apt list --upgradable 2>/dev/null | grep -i security | wc -l > /tmp/security_updates
security_count=$(cat /tmp/security_updates)
if [ $security_count -gt 0 ]; then
  echo "$security_count security updates available:"
  apt list --upgradable 2>/dev/null | grep -i security
else
  echo "No security updates available"
fi

# Check Node.js vulnerabilities
echo "2. Checking Node.js vulnerabilities..."
cd /home/robbie/Desktop/HostingCo
npm audit --audit-level high 2>/dev/null | grep -c "high\|critical" > /tmp/npm_vulns
npm_vulns=$(cat /tmp/npm_vulns)
if [ $npm_vulns -gt 0 ]; then
  echo "$npm_vulns high/critical vulnerabilities found"
  npm audit --audit-level high
else
  echo "No high/critical vulnerabilities found"
fi

# Check SSL certificate expiry
echo "3. Checking SSL certificate expiry..."
if [ -f /etc/ssl/certs/yourdomain.crt ]; then
  expiry_date=$(openssl x509 -in /etc/ssl/certs/yourdomain.crt -noout -enddate | cut -d= -f2)
  expiry_timestamp=$(date -d "$expiry_date" +%s)
  current_timestamp=$(date +%s)
  days_until_expiry=$(( ($expiry_timestamp - $current_timestamp) / 86400 ))

  if [ $days_until_expiry -lt 30 ]; then
    echo "SSL certificate expires in $days_until_expiry days"
  else
    echo "SSL certificate valid for $days_until_expiry days"
  fi
else
  echo "SSL certificate not found"
fi

# Check firewall status
echo "4. Checking firewall status..."
ufw status | grep -E "(Status|active)" || echo "Firewall not configured"

echo "=== Security Updates Check Complete ==="

Monthly Maintenance Tasks

Comprehensive System Audit

#!/bin/bash
# monthly-system-audit.sh

echo "=== Monthly System Audit - $(date) ==="

# System information
echo "1. System Information:"
uname -a
echo "Uptime: $(uptime -p)"
echo "Kernel: $(uname -r)"
echo "Memory: $(free -h | grep Mem)"
echo "Disk: $(df -h /)"

# Service status
echo "2. Service Status:"
systemctl list-units --type=service --state=running | grep -E "(postgresql|redis|nginx|hostingco)"

# Application versions
echo "3. Application Versions:"
node --version
npm --version
psql --version 2>/dev/null || echo "PostgreSQL not in PATH"
redis-cli --version 2>/dev/null || echo "Redis not in PATH"

# Database statistics
echo "4. Database Statistics:"
psql -h localhost -U hostingco -d hostingco -c "
SELECT 
  (SELECT count(*) FROM users) as total_users,
  (SELECT count(*) FROM users WHERE is_active = true) as active_users,
  (SELECT count(*) FROM servers) as total_servers,
  (SELECT count(*) FROM servers WHERE status = 'active') as active_servers,
  (SELECT count(*) FROM support_tickets WHERE created_at > NOW() - INTERVAL '30 days') as tickets_last_30d;
"

# Performance metrics
echo "5. Performance Metrics:"
echo "Load Average: $(uptime | awk -F'load average:' '{print $2}')"
echo "Memory Usage: $(free | grep Mem | awk '{printf("%.1f%%", $3/$2 * 100.0)}')"
echo "Disk Usage: $(df -h / | awk 'NR==2{print $5}')"

# Error summary
echo "6. Error Summary:"
error_count=$(grep -c "ERROR" /var/log/hostingco/backend/error.log 2>/dev/null || echo "0")
echo "Total errors in log: $error_count"

echo "=== Monthly System Audit Complete ==="

Database Optimization

#!/bin/bash
# database-optimization.sh

echo "=== Database Optimization - $(date) ==="

# Vacuum and analyze
echo "1. Running VACUUM and ANALYZE..."
psql -h localhost -U hostingco -d hostingco -c "VACUUM ANALYZE;"

# Reindex fragmented tables
echo "2. Checking for fragmented tables..."
psql -h localhost -U hostingco -d hostingco -c "
SELECT schemaname, tablename, 
       pg_size_pretty(pg_total_relation_size(schemaname||'.'||tablename)) as size,
       (SELECT count(*) FROM pg_stat_user_indexes WHERE schemaname = pg_tables.schemaname AND tablename = pg_tables.tablename) as index_count
FROM pg_tables 
WHERE schemaname = 'public'
ORDER BY pg_total_relation_size(schemaname||'.'||tablename) DESC
LIMIT 5;"

# Update table statistics
echo "3. Updating table statistics..."
psql -h localhost -U hostingco -d hostingco -c "
SELECT 'ANALYZE ' || tablename || ';' FROM pg_tables WHERE schemaname = 'public';
" | psql -h localhost -U hostingco -d hostingco

# Check for unused indexes
echo "4. Checking for unused indexes..."
psql -h localhost -U hostingco -d hostingco -c "
SELECT schemaname, tablename, indexname, 
       pg_size_pretty(pg_relation_size(indexrelid)) as index_size
FROM pg_stat_user_indexes 
WHERE idx_scan = 0
AND schemaname = 'public'
ORDER BY pg_relation_size(indexrelid) DESC;"

# Clean up old data
echo "5. Cleaning up old data..."
# Delete old activity logs (keep 90 days)
psql -h localhost -U hostingco -d hostingco -c "DELETE FROM activity_logs WHERE timestamp < NOW() - INTERVAL '90 days';"

# Delete old session data
psql -h localhost -U hostingco -d hostingco -c "DELETE FROM sessions WHERE created_at < NOW() - INTERVAL '7 days';"

echo "=== Database Optimization Complete ==="

System Updates

Software Update Procedures

Application Updates

#!/bin/bash
# application-update.sh

echo "=== Application Update - $(date) ==="

# Backup current version
echo "1. Creating backup..."
cd /home/robbie/Desktop/HostingCo
tar -czf /backups/hostingco-backup-$(date +%Y%m%d_%H%M%S).tar.gz .

# Check for updates
echo "2. Checking for updates..."
git fetch origin
current_branch=$(git branch --show-current)
upstream_changes=$(git log HEAD..origin/$current_branch --oneline | wc -l)

if [ $upstream_changes -gt 0 ]; then
  echo "Updates available: $upstream_changes changes"

  # Stop services
  echo "3. Stopping services..."
  npm run stop:all

  # Pull updates
  echo "4. Pulling updates..."
  git pull origin $current_branch

  # Install dependencies
  echo "5. Installing dependencies..."
  npm run install:all

  # Run database migrations
  echo "6. Running database migrations..."
  cd backend && npm run migrate

  # Build applications
  echo "7. Building applications..."
  npm run build

  # Start services
  echo "8. Starting services..."
  npm run start:all

  # Health check
  echo "9. Performing health check..."
  sleep 10
  curl -s http://localhost:3003/api/health > /dev/null && echo "Update successful" || echo "Update failed"

else
  echo "No updates available"
fi

echo "=== Application Update Complete ==="

System Package Updates

#!/bin/bash
# system-update.sh

echo "=== System Update - $(date) ==="

# Update package lists
echo "1. Updating package lists..."
apt update

# Check available updates
echo "2. Checking available updates..."
apt list --upgradable

# Install security updates first
echo "3. Installing security updates..."
apt upgrade -y -o Dir::etc::sourceparts="security.list"

# Install other updates
echo "4. Installing other updates..."
apt upgrade -y

# Clean up
echo "5. Cleaning up..."
apt autoremove -y
apt autoclean

echo "=== System Update Complete ==="

Node.js and Dependencies Updates

Node.js Version Management

#!/bin/bash
# nodejs-update.sh

echo "=== Node.js Update - $(date) ==="

# Check current Node.js version
current_version=$(node --version)
echo "Current Node.js version: $current_version"

# Check latest LTS version
latest_lts=$(nvm version-remote --lts | tail -1)
echo "Latest LTS version: $latest_lts"

if [ "$current_version" != "$latest_lts" ]; then
  echo "Node.js update available"

  # Stop services
  echo "Stopping services..."
  npm run stop:all

  # Install latest LTS
  echo "Installing latest LTS..."
  nvm install $latest_lts
  nvm use $latest_lts
  nvm alias default $latest_lts

  # Rebuild native modules
  echo "Rebuilding native modules..."
  npm rebuild

  # Restart services
  echo "Restarting services..."
  npm run start:all

  echo "Node.js updated to $latest_lts"
else
  echo "Node.js is up to date"
fi

echo "=== Node.js Update Complete ==="

Dependency Updates

#!/bin/bash
# dependency-update.sh

echo "=== Dependency Update - $(date) ==="

# Check for outdated packages
echo "1. Checking for outdated packages..."
cd /home/robbie/Desktop/HostingCo
npm outdated

# Update patch versions
echo "2. Updating patch versions..."
npm update

# Check for security vulnerabilities
echo "3. Checking for vulnerabilities..."
npm audit

# Fix vulnerabilities if found
vulns=$(npm audit --json | jq -r '.vulnerabilities | length' 2>/dev/null || echo "0")
if [ "$vulns" -gt 0 ]; then
  echo "4. Fixing vulnerabilities..."
  npm audit fix
fi

# Test application after updates
echo "5. Testing application..."
npm test

echo "=== Dependency Update Complete ==="

Performance Optimization

Database Performance Tuning

PostgreSQL Optimization

#!/bin/bash
# postgresql-optimization.sh

echo "=== PostgreSQL Optimization - $(date) ==="

# Check current configuration
echo "1. Current PostgreSQL configuration:"
psql -h localhost -U hostingco -d hostingco -c "SHOW shared_buffers;"
psql -h localhost -U hostingco -d hostingco -c "SHOW effective_cache_size;"
psql -h localhost -U hostingco -d hostingco -c "SHOW work_mem;"

# Analyze slow queries
echo "2. Analyzing slow queries..."
psql -h localhost -U hostingco -d hostingco -c "
SELECT query, mean_time, calls, total_time
FROM pg_stat_statements
WHERE mean_time > 1000
ORDER BY mean_time DESC
LIMIT 10;"

# Check index usage
echo "3. Checking index usage..."
psql -h localhost -U hostingco -d hostingco -c "
SELECT schemaname, tablename, indexname, idx_scan, idx_tup_read, idx_tup_fetch
FROM pg_stat_user_indexes
ORDER BY idx_scan DESC;"

# Optimize configuration based on system resources
echo "4. Optimizing configuration..."
total_memory=$(free -m | awk '/^Mem:/{print $2}')
shared_buffers=$((total_memory / 4))  # 25% of RAM
effective_cache_size=$((total_memory * 3 / 4))  # 75% of RAM

echo "Recommended settings:"
echo "shared_buffers = ${shared_buffers}MB"
echo "effective_cache_size = ${effective_cache_size}MB"
echo "work_mem = 4MB"
echo "maintenance_work_mem = 64MB"

echo "=== PostgreSQL Optimization Complete ==="

Application Performance Optimization

#!/bin/bash
# application-optimization.sh

echo "=== Application Performance Optimization - $(date) ==="

# Check Node.js memory usage
echo "1. Node.js memory usage:"
ps aux | grep node | awk '{print $4, $11}' | while read mem cmd; do
  echo "Memory: $mem, Command: $cmd"
done

# Check response times
echo "2. Checking API response times..."
for endpoint in "/api/health" "/api/users" "/api/servers"; do
  echo "Testing $endpoint..."
  curl -w "@curl-format.txt" -o /dev/null -s "http://localhost:3003$endpoint"
done

# Check database query performance
echo "3. Database query performance:"
psql -h localhost -U hostingco -d hostingco -c "
SELECT query, mean_time, calls
FROM pg_stat_statements
ORDER BY mean_time DESC
LIMIT 5;"

# Check for memory leaks
echo "4. Checking for memory leaks..."
node --inspect --heap-prof backend/dist/index.js &
NODE_PID=$!
sleep 30
kill -USR2 $NODE_PID
wait $NODE_PID

echo "=== Application Performance Optimization Complete ==="

Cache Optimization

Redis Cache Management

#!/bin/bash
# redis-optimization.sh

echo "=== Redis Cache Optimization - $(date) ==="

# Check Redis memory usage
echo "1. Redis memory usage:"
redis-cli info memory | grep -E "(used_memory|maxmemory)"

# Check cache hit rate
echo "2. Cache hit rate:"
redis-cli info stats | grep -E "(keyspace_hits|keyspace_misses)"

# Check number of keys
echo "3. Number of keys by database:"
for db in {0..15}; do
  count=$(redis-cli -n $db dbsize 2>/dev/null)
  if [ "$count" != "0" ]; then
    echo "DB$db: $count keys"
  fi
done

# Clean up expired keys
echo "4. Cleaning up expired keys..."
redis-cli --scan --pattern "*:expired:*" | xargs redis-cli del

# Optimize Redis configuration
echo "5. Redis configuration:"
redis-cli config get maxmemory
redis-cli config get maxmemory-policy
redis-cli config get timeout

echo "=== Redis Cache Optimization Complete ==="

🔒 Security Maintenance

Security Patch Management

Vulnerability Scanning

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

echo "=== Vulnerability Scan - $(date) ==="

# System vulnerability scan
echo "1. System vulnerability scan:"
if command -v lynis >/dev/null 2>&1; then
  lynis audit system --quick
else
  echo "Lynis not installed, skipping system scan"
fi

# Node.js vulnerability scan
echo "2. Node.js vulnerability scan:"
cd /home/robbie/Desktop/HostingCo
npm audit --audit-level high

# Web application security scan
echo "3. Web application security scan:"
if command -v nikto >/dev/null 2>&1; then
  nikto -h http://localhost:3000 -output /tmp/nikto_report.html
else
  echo "Nikto not installed, skipping web scan"
fi

# SSL/TLS security check
echo "4. SSL/TLS security check:"
if command -v testssl.sh >/dev/null 2>&1; then
  testssl.sh --quiet https://localhost:3000
else
  echo "testssl.sh not installed, skipping SSL check"
fi

echo "=== Vulnerability Scan Complete ==="

Security Configuration Review

#!/bin/bash
# security-config-review.sh

echo "=== Security Configuration Review - $(date) ==="

# Check file permissions
echo "1. Checking file permissions:"
find /home/robbie/Desktop/HostingCo -type f -perm /o+w -ls
find /home/robbie/Desktop/HostingCo -type f -perm /g+w -ls

# Check user permissions
echo "2. Checking user permissions:"
find /home/robbie/Desktop/HostingCo -type f -user $(whoami) -ls

# Check for world-writable files
echo "3. Checking for world-writable files:"
find /home/robbie/Desktop/HostingCo -type f -perm /o+w -exec ls -la {} \;

# Check SSH configuration
echo "4. SSH configuration:"
if [ -f /etc/ssh/sshd_config ]; then
  grep -E "(PermitRootLogin|PasswordAuthentication|PubkeyAuthentication)" /etc/ssh/sshd_config
else
  echo "SSH config not found"
fi

# Check firewall rules
echo "5. Firewall rules:"
ufw status verbose

echo "=== Security Configuration Review Complete ==="

Monitoring and Alerting

Monitoring System Maintenance

Health Check Automation

// health-check-automation.js
const cron = require('node-cron');

class HealthCheckAutomation {
  constructor() {
    this.setupCronJobs();
  }

  setupCronJobs() {
    // Every 5 minutes - critical services
    cron.schedule('*/5 * * * *', async () => {
      await this.checkCriticalServices();
    });

    // Every hour - detailed checks
    cron.schedule('0 * * * *', async () => {
      await this.performDetailedChecks();
    });

    // Daily - comprehensive check
    cron.schedule('0 2 * * *', async () => {
      await this.performComprehensiveCheck();
    });
  }

  async checkCriticalServices() {
    const checks = [
      { name: 'Backend API', url: 'http://localhost:3003/api/health' },
      { name: 'Frontend', url: 'http://localhost:3000' },
      { name: 'Database', check: this.checkDatabase },
      { name: 'Redis', check: this.checkRedis }
    ];

    for (const check of checks) {
      try {
        if (check.url) {
          const response = await fetch(check.url);
          if (!response.ok) {
            await this.sendAlert(`${check.name} is down`, 'critical');
          }
        } else if (check.check) {
          const result = await check.check();
          if (!result) {
            await this.sendAlert(`${check.name} is down`, 'critical');
          }
        }
      } catch (error) {
        await this.sendAlert(`${check.name} check failed: ${error.message}`, 'critical');
      }
    }
  }

  async checkDatabase() {
    try {
      await knex.raw('SELECT 1');
      return true;
    } catch (error) {
      return false;
    }
  }

  async checkRedis() {
    try {
      await redis.ping();
      return true;
    } catch (error) {
      return false;
    }
  }

  async sendAlert(message, severity) {
    // Send to monitoring system
    console.error(`[${severity.toUpperCase()}] ${message}`);

    // Send webhook notification
    if (process.env.WEBHOOK_URL) {
      await fetch(process.env.WEBHOOK_URL, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          message,
          severity,
          timestamp: new Date().toISOString(),
          service: 'hostingco-backend'
        })
      });
    }
  }
}

module.exports = HealthCheckAutomation;

Performance Monitoring

Metrics Collection

// metrics-collection.js
class MetricsCollector {
  constructor() {
    this.setupMetricsCollection();
  }

  setupMetricsCollection() {
    // Collect system metrics every minute
    setInterval(async () => {
      await this.collectSystemMetrics();
    }, 60000);

    // Collect application metrics every 5 minutes
    setInterval(async () => {
      await this.collectApplicationMetrics();
    }, 300000);
  }

  async collectSystemMetrics() {
    const metrics = {
      timestamp: new Date().toISOString(),
      cpu: await this.getCPUUsage(),
      memory: await this.getMemoryUsage(),
      disk: await this.getDiskUsage(),
      network: await this.getNetworkUsage()
    };

    // Store metrics
    await this.storeMetrics('system', metrics);

    // Check thresholds
    await this.checkThresholds(metrics);
  }

  async collectApplicationMetrics() {
    const metrics = {
      timestamp: new Date().toISOString(),
      response_time: await this.getAverageResponseTime(),
      error_rate: await this.getErrorRate(),
      active_connections: await this.getActiveConnections(),
      database_connections: await this.getDatabaseConnections()
    };

    // Store metrics
    await this.storeMetrics('application', metrics);
  }

  async checkThresholds(metrics) {
    const thresholds = {
      cpu: 80,
      memory: 85,
      disk: 90,
      response_time: 2000,
      error_rate: 5
    };

    for (const [metric, value] of Object.entries(metrics)) {
      if (metric !== 'timestamp' && value > thresholds[metric]) {
        await this.sendAlert(`${metric} threshold exceeded: ${value}%`, 'warning');
      }
    }
  }
}

Maintenance Procedures Checklist

Daily Checklist

[ ] Run health check script
[ ] Monitor system resource usage
[ ] Check error logs for critical issues
[ ] Verify backup completion
[ ] Monitor application response times
[ ] Check database connection counts
[ ] Review security alerts

Weekly Checklist

[ ] Run performance review script
[ ] Check for system updates
[ ] Review application logs for patterns
[ ] Monitor disk space trends
[ ] Check database performance
[ ] Review user activity metrics
[ ] Test backup restoration

Monthly Checklist

[ ] Run comprehensive system audit
[ ] Perform database optimization
[ ] Update application dependencies
[ ] Review and update documentation
[ ] Perform security vulnerability scan
[ ] Test disaster recovery procedures
[ ] Review monitoring thresholds
[ ] Update maintenance schedules

Quarterly Checklist

[ ] Comprehensive security audit
[ ] Performance baseline review
[ ] Capacity planning assessment
[ ] Disaster recovery testing
[ ] System architecture review
[ ] Update maintenance procedures
[ ] Review and update monitoring tools
[ ] Conduct team training review

Emergency Maintenance

Emergency Procedures

System Outage Response

#!/bin/bash
# emergency-response.sh

echo "=== Emergency Response - $(date) ==="

# 1. Assess the situation
echo "1. Assessing situation..."
system_status=$(systemctl is-active hostingco-backend)
if [ "$system_status" != "active" ]; then
  echo "Backend service is down"

  # 2. Check logs for errors
  echo "2. Checking logs..."
  tail -50 /var/log/hostingco/backend/error.log

  # 3. Attempt restart
  echo "3. Attempting restart..."
  systemctl restart hostingco-backend

  # 4. Wait and check status
  sleep 10
  system_status=$(systemctl is-active hostingco-backend)
  if [ "$system_status" = "active" ]; then
    echo "Service restarted successfully"
  else
    echo "Service restart failed, escalating..."
    # Send emergency notification
    curl -X POST https://hooks.slack.com/services/YOUR/SLACK/WEBHOOK \
      -H 'Content-type: application/json' \
      --data '{"text":"EMERGENCY: HostingCo backend service down and restart failed"}'
  fi
fi

echo "=== Emergency Response Complete ==="

Database Emergency Procedures

#!/bin/bash
# database-emergency.sh

echo "=== Database Emergency Response - $(date) ==="

# Check database status
echo "1. Checking database status..."
if ! pg_isready -h localhost -p 5432 -U hostingco; then
  echo "Database is not responding"

  # Check PostgreSQL service
  echo "2. Checking PostgreSQL service..."
  pg_status=$(systemctl is-active postgresql)
  if [ "$pg_status" != "active" ]; then
    echo "Starting PostgreSQL service..."
    systemctl start postgresql
    sleep 5
  fi

  # Check for corruption
  echo "3. Checking for database corruption..."
  pg_controldata -D /var/lib/postgresql/15/main

  # Attempt recovery if needed
  echo "4. Attempting recovery..."
  pg_ctl -D /var/lib/postgresql/15/main start

else
  echo "Database is responding"
fi

echo "=== Database Emergency Response Complete ==="

📞 Maintenance Support

When to Contact Support

Critical Issues

System completely down
Data corruption suspected
Security breach detected
Backup failures
Performance degradation > 50%

Support Contact Information

Emergency Hotline: +1-555-EMERGENCY
Technical Support: support@hostingco.com
Documentation: Troubleshooting Guide

Maintenance Documentation Updates

Procedure Updates

Update procedures when system architecture changes
Revise checklists based on incident lessons learned
Document new tools and automation scripts
Update contact information and escalation procedures

Last updated: $(date)