# useradd ftun
# su - ftun

$ ssh-keygen -trsa

Your identification has been saved in /home/ftun/.ssh/id_rsa.
Your public key has been saved in /home/ftun/.ssh/id_rsa.pub.

$ scp ~/.ssh/id_rsa.pub ftun@fr-wd.com:.ssh/authorized_keys

install /home/ftun/bin/check_ssh_tunnel.sh

add cronjob

#*/1 * * * * /home/ftun/bin/check_ssh_tunnel.sh >> /dev/null 2>&1 &