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apt-get install fail2ban sendmail
 sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
 cd /etc/fail2ban/
sudo nano jail.local
 systemctl service enable fail2ban
 fail2ban-client  status
 fail2ban-client  status sshd
 fail2ban-client ser sshd unbanip xxx.xxx.xxx.xxx
 service fail2ban restart