Simple fail2ban script for your server. Props: maxretry=3, bantime=7200

fail2ban.sh

#!/bin/bash

sudo apt-get update && sudo apt-get install fail2ban -y

i=1;
ports="";
for port in "$@"
do
        if [ "$ports" = "" ];
        then
                ports=${port}
        else
                ports+=",${port}"
        fi
done

sudo bash -c 'echo "[sshd]
enabled = true
port = ${ports}
filter = sshd
logpath = /var/log/auth.log
maxretry = 3
bantime = 7200 " > /etc/fail2ban/jail.local'

sudo service fail2ban restart
sudo service fail2ban status