fail2ban

Identity

• Unit: fail2ban.service
• Config: /etc/fail2ban/jail.local (local overrides — never edit jail.conf)
• Jails dir: /etc/fail2ban/jail.d/ (drop-in jail files)
• Filters dir: /etc/fail2ban/filter.d/ (regex patterns per service)
• Actions dir: /etc/fail2ban/action.d/ (ban/unban actions)
• Logs: journalctl -u fail2ban, /var/log/fail2ban.log
• Install: apt install fail2ban / dnf install fail2ban

Key Operations