install

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

. 调整backend，如果是 init 选择 auto , 如果是 systemd 选择 systemd . 在[sshd]下填入enabled = true启动 sshd监控

vim /etc/fail2ban/jail.local


# backend = auto
backend = systemd

...

[sshd]
enabled = true



systemctl enable fail2ban
systemctl start fail2ban
fail2ban-client status 
fail2ban-client status sshd