Duck DDNS

Duck DDNS:

linux cron

if your linux install is running a crontab, then you can use a cron job to keep updated

we can see this with

ps -ef | grep cr[o]n

if this returns nothing - then go and read up how to install cron for your distribution of linux.

also confirm that you have curl installed, test this by attempting to run curl

curl

if this returns a command not found like error - then find out how to install curl for your distribution.

otherwise lets get started and make a directory to put your files in, move into it and make our main script

mkdir duckdns

cd duckdns

vi duck.sh

now copy this text and put it into the file (in vi you hit the i key to insert, ESC then u to undo) you must change your token and domain to be the one you want to update

you can pass a comma separated (no spaces) list of domains

you can if you need to hard code an IP (best not to - leave it blank and we detect your remote ip)

hit ESC then use use arrow keys to move the cursor x deletes, i puts you back into insert mode

echo url="https://www.duckdns.org/update?domains=exampledomain&token=a7c4d0ad-114e-40ef-ba1d-d217904a50f2&ip=" | curl -k -o ~/duckdns/duck.log -K -

now save the file (in vi hit ESC then :wq! then ENTER)

this script will make a https request and log the output in the file duck.log

now make the duck.sh file executeable

chmod 700 duck.sh

next we will be using the cron process to make the script get run every 5 minutes

crontab -e

copy this text and paste it at the bottom of the crontab

*/5 * * * * ~/duckdns/duck.sh >/dev/null 2>&1

now save the file (CTRL+o then CTRL+x)

lets test the script

./duck.sh

this should simply return to a prompt

we can also see if the last attempt was successful (OK or bad KO)

cat duck.log

if it is KO check your Token and Domain are correct in the duck.sh script

what now?

Well you probably want to setup port forwarding on your router to make use of your new DDNS name

we recommend portforward.com to learn all about this.

REF: https://www.duckdns.org/install.jsp