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Self-Hosting Crowdsec: Community-Powered Security

CrowdSec is a modern fail2ban alternative. Behavior detection plus crowd-sourced threat intelligence for self-hosted infrastructure.

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What Is CrowdSec?


CrowdSec is a security tool that detects malicious behavior and shares threat intelligence with the community. When one CrowdSec user detects an attacker, all other users benefit.


CrowdSec vs fail2ban


fail2ban

  • Reads logs and bans IPs based on patterns
  • Local only (your bans don't help others)
  • Regex-based (fragile)
  • No shared intelligence

    • CrowdSec

  • Reads logs and detects malicious behavior
  • Shares IPs with the community (opt-in)
  • Structured parsers (more reliable)
  • Community blocklists
  • Multi-server coordination

    • How It Works


    1. CrowdSec reads your logs (SSH, Caddy, Nginx, etc.)

    2. Detects malicious patterns (brute force, scanning, exploits)

    3. Takes action (ban IP, CAPTCHA, throttle)

    4. Reports the IP to the community hub

    5. Your server also receives community reports


    Components


    Agent

    Reads logs and detects threats.


    Bouncer

    Enforces decisions (blocks IPs). Bouncers for:

  • Firewall (iptables/nftables)
  • Caddy
  • Nginx
  • Traefik
  • Cloudflare

    • Hub

    Community-shared threat intelligence. Subscribe to scenarios, parsers, and blocklists.


    Deployment


    1. Deploy CrowdSec on TinyPod

    2. Install bouncers for your services

    3. Configure log sources

    4. Connect to the community hub

    5. Attackers are blocked automatically


    Resources: 1 CPU, 256 MB RAM.


    What It Protects Against


  • SSH brute force
  • HTTP scanning and probing
  • Application-level attacks
  • Known malicious IPs (community blocklist)
  • Credential stuffing

    • CrowdSec is the modern approach to self-hosted security. Community intelligence makes every user safer.