Terug naar DocumentatieFail2ban monitors your server logs and automatically blocks IPs that attempt repeated failed logins. It's one of the most important basic security tools for any server exposed on the internet.
Installation
# Debian/Ubuntu
apt install fail2ban -y
# CentOS/AlmaLinux
dnf install fail2ban -y
# Enable and start
systemctl enable fail2ban
systemctl start fail2ban
Configuration
Fail2ban uses configuration files in /etc/fail2ban/. Never modify jail.conf directly: instead create jail.local which takes precedence:
nano /etc/fail2ban/jail.local
Recommended base configuration:
[DEFAULT]
# Ban for 1 hour (3600 seconds)
bantime = 3600
# Consider the interval of the last 10 minutes
findtime = 600
# Ban after 5 failed attempts
maxretry = 5
# Email notifications (optional)
# destemail = admin@example.com
# action = %(action_mwl)s
[sshd]
enabled = true
port = ssh
logpath = %(sshd_log)s
backend = %(sshd_backend)s
maxretry = 3
[nginx-http-auth]
enabled = true
[nginx-botsearch]
enabled = true
port = http,https
logpath = %(nginx_error_log)s
maxretry = 2
After modifying, restart:
systemctl restart fail2ban
Useful Commands
Check Status
fail2ban-client status
View Banned IPs in a Jail
fail2ban-client status sshd
Unban an IP
fail2ban-client set sshd unbanip IP_TO_UNBAN
Manually Ban an IP
fail2ban-client set sshd banip IP_TO_BAN
View Fail2ban Logs
tail -f /var/log/fail2ban.log
Protect Other Services
WordPress / Web Login
[nginx-wordpress]
enabled = true
port = http,https
filter = nginx-wordpress
logpath = /var/log/nginx/access.log
maxretry = 5
findtime = 300
bantime = 3600
Postfix (Email)
[postfix]
enabled = true
port = smtp,465,submission
logpath = %(postfix_log)s
MySQL
[mysqld-auth]
enabled = true
port = 3306
logpath = %(mysql_log)s
Whitelist: Avoid Banning Yourself
Add your IP to the whitelist to avoid blocking yourself:
[DEFAULT]
ignoreip = 127.0.0.1/8 ::1 YOUR_PUBLIC_IP
If you're the only one accessing the server, always add your IP to the whitelist before enabling Fail2ban. Otherwise you risk banning yourself after too many failed login attempts.
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