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Set Up CrowdSec on VPS – Modern Firewall Against Bots & Brute Force

Quick answer: CrowdSec detects attacks in logs and blocks IPs via a bouncer – often the better Fail2ban alternative in 2026, combined with UFW.

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Frequently asked questions (FAQ)

CrowdSec or Fail2ban?
Fail2ban: local, proven. CrowdSec: community blocklists, modern scenarios, often better bot detection. Rarely need both.
Can CrowdSec block legit users?
Possible with aggressive scenarios. Whitelist your IPs/VPN; check cscli decisions list.
CrowdSec without UFW?
No. Base firewall (UFW) + CrowdSec bouncer. UFW opens ports; CrowdSec blocks attacker IPs.
Resource use?
Low (usually <100 MB RAM). Fine on small 2 GB VPS.
With Caddy/Traefik?
HTTP scenarios read access logs. Bouncer applies iptables/nftables blocks.

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