Also if you want to change SSH port:
vi /etc/init.d/S50dropbear
and then change line from
start-stop-daemon -S -q -p /var/run/dropbear.pid --exec /usr/sbin/dropbear
to
start-stop-daemon -S -q -p /var/run/dropbear.pid --exec /usr/sbin/dropbear -- -p 1234
(change 1234 to your port choice)
I recommend this to avoid hacker attacks if you plan to control your miner from outside your LAN.