安装软件

sudo yum install epel-release -y
sudo yum install fail2ban -y
sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local

编辑文件/etc/fail2ban/jail.local

[sshd]
enabled = true
port = 22

启动服务

sudo systemctl start fail2ban
sudo systemctl enable fail2ban

测试

tail -fn 400 /var/log/fail2ban.log