Your VPS Under Threat? A Security Checklist That Will Save Your Server from Hackers and DDoS

Serhii Shypylov

• 2 min read
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Your VPS Under Threat? A Security Checklist That Will Save Your Server from Hackers and DDoS

Why Does a VPS Require Special Protection?

A rented server is your digital home. If you don't lock the door, unwanted guests will eventually get in.

Unlike shared hosting, a VPS gives you full control—and therefore full responsibility for security.

VPS security is not a one-time action but an ongoing process. One properly configured firewall can stop 90% of attacks.

1. Firewall: Your First Barrier

Without a firewall, your server is open to the entire internet. It's like an invitation for botnets and port scanners.

  • 🔒 Use UFW or iptables on Linux.
  • 🌐 Allow only the necessary ports: 22 (SSH), 80 (HTTP), 443 (HTTPS).
  • 🚫 Deny all incoming connections by default.
  • 🔄 Harden SSH: change the port, disable root login, use SSH keys.
Simple rule: the fewer open ports, the smaller the attack surface.

2. SSL Certificates: Encrypt Everything

SSL turns your traffic into unreadable code for outsiders. Without it, passwords and customer data are transmitted in plain text.

Today, Let's Encrypt provides free certificates. Set up auto-renewal so you don't have to think about it.

  • 🔐 Install SSL on all subdomains and the main domain.
  • 🔄 Set up redirect from HTTP to HTTPS.
  • 📋 Check certificate expiry in your monitoring dashboard.
  • 🛡️ Use HSTS to ensure browsers always use a secure connection.

3. Monitoring: See Everything

Hackers often act quietly. You may not notice a breach until it's too late.

Set up anomaly alerts to respond in minutes, not months.

  • 📊 Prometheus + Grafana for CPU, RAM, disk, and network metrics.
  • 📡 Netdata — simple real-time monitoring.
  • 📧 Email or Telegram alerts when services go down.
  • 🗂️ Review access logs (auth.log) for suspicious login attempts.
Monitoring is your eyes. If you don't see an attack, it's already happening.

4. DDoS Protection: Withstand the Blow

DDoS attacks can stop even a powerful server by flooding the channel with junk traffic.

Don't wait until you're attacked. Prepare your defenses in advance.

  • 🛡️ Use Cloudflare as a proxy — it filters most attacks at the DNS level.
  • ⚙️ Configure rate limiting at the Nginx or Apache level.
  • 🌊 Disable ICMP responses and close unused protocols.
  • 💥 Consider dedicated DDoS protection from your hosting provider.

5. Updates and Backups

Old software versions are open doors for exploits. Regular updates close known vulnerabilities.

And backups are your lifeline in case of ransomware or human error.

  • 🔄 Enable automatic updates for the kernel and packages.
  • 💾 Make daily backups to external storage.
  • 🧪 Test restoring from backups at least once a month.
  • 🔑 Store keys and passwords in a password manager, not in config files.

Conclusion

VPS security is a system, not isolated actions. Firewall, SSL, monitoring, DDoS protection, updates — all of these work together.

Invest a few hours in setting up protection now to avoid losing days recovering after an attack.

Start small: enable the firewall and set up monitoring. That alone will increase your security level by 80%.

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