Crowdsec Has a Free Intrusion Prevention System — Community-Powered Security for Servers

CrowdSec is a collaborative, open-source intrusion prevention system (IPS).

What You Get for Free

• Log analysis — detect attacks from nginx, SSH, WordPress, and 100+ services
• Community blocklists — shared threat intelligence from 200K+ users
• Bouncers — automatically block attackers (firewall, nginx, Cloudflare)
• Scenarios — detect brute force, DDoS, credential stuffing, scanners
• Console — web dashboard for monitoring and management
• API — programmatic access to decisions and alerts
• Multi-platform — Linux, Windows, Docker, Kubernetes
• Free console — up to 5 security engines, 10 bouncers

Quick Start

# Install on any Linux
curl -s https://install.crowdsec.net | bash

# Install firewall bouncer (auto-blocks attackers)
sudo apt install crowdsec-firewall-bouncer-iptables

# Enroll in console (free dashboard)
sudo cscli console enroll YOUR_KEY

# Check detected attacks
sudo cscli alerts list
sudo cscli decisions list

Why Sysadmins Choose It Over Fail2ban

Fail2ban is reactive and isolated. CrowdSec:

• Community intelligence — benefit from attacks detected globally
• Faster detection — behavioral scenarios, not just regex
• Multiple bouncers — firewall, nginx, Cloudflare, HAProxy
• Modern architecture — Go-based, API-driven, container-ready

A server was getting 50,000 brute-force SSH attempts daily. After installing CrowdSec, known attackers were blocked before the first attempt — community blocklists from 200K+ installations provide preemptive protection.

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