Update 'installer.sh'

installer.sh

@@ -142,6 +142,7 @@ timedatectl set-timezone Europe/Amsterdam
 sed -i 's/#/vm.swappiness=10/g' /etc/sysctl.conf
 sed -i 's/#/vm.vfs_cache_pressure=50/g' /etc/sysctl.conf
 
+sed -i 's/IPV6=yes/IPV6=no/g'   /etc/default/ufw
 sed -i "\$a0 3 * * 1 root apt update >/dev/null 2>&1&& apt upgrade -y >/dev/null 2>&1" /etc/crontab
 systemctl restart cron
 ufw allow OpenSSH
@@ -150,6 +151,10 @@ ufw allow 80/tcp
 ufw limit ssh
 echo "y" | ufw enable
 
+mkdir /root/.ssh
+
+apt install fail2ban -y
+
 ##-------------------##
 #    Install Phase    #
 ##-------------------##