วิธีติดตั้งและตั้งค่า Fail2ban บน Linux

# Ubuntu / Debian
sudo apt update
sudo apt install fail2ban -y
sudo systemctl enable fail2ban
sudo systemctl start fail2ban

# CentOS / RHEL / Alma / Rocky
sudo yum install epel-release -y
sudo yum install fail2ban -y
sudo systemctl enable fail2ban
sudo systemctl start fail2ban

sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
sudo nano /etc/fail2ban/jail.local

[sshd]
enabled = true
port = ssh
filter = sshd
logpath = /var/log/auth.log
maxretry = 5
bantime = 3600
findtime = 600

sudo systemctl restart fail2ban

[nginx-http-auth]
enabled = true
port = http,https
filter = nginx-http-auth
logpath = /var/log/nginx/error.log
maxretry = 5

[nginx-noscript]
enabled = true
port = http,https
filter = nginx-noscript
logpath = /var/log/nginx/access.log
maxretry = 6

sudo fail2ban-client status
sudo fail2ban-client status sshd

# Unban an IP if needed:
sudo fail2ban-client set sshd unbanip 1.2.3.4