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Advanced

Setup of cron and logrotate

You can setup a cron job for the script sudo crontab -e and type :

*/5 * * * * /usr/local/bin/ddns-updater-aws >> /var/log/ddnsupdater

I personnaly use logrotate to rotate the created log vim /etc/logrotate.d/ddnsupdater and type

/var/log/ddnsupdater {
size 1k
copytruncate
missingok
rotate 5
}

Config File

The default config files contains a non-working configuration which needs to be filled :

  • The settings ddns_provider_aws/aws_access_key_id and ddns_provider_aws/aws_secret_access_key are used to identify yourself to amazon.
  • The setting ddns_provider_aws/zone_id and ddns_provider_aws/record_set_name are used to identify the record that you which to modify

see 'Specify interface / port for dns query' before using those parameters

  • The setting ip_provider_opendns/interface_name is used to specify the port on which the dns query should be made.
  • The setting ip_provider_opendns/interface_name is used to ensure dns query starts from specified interface.

Specify interface / port for dns query

Sometime, you need network magic. In my case, I needed to bypass a vpn tunnel to get the ip address. The following parameter can be used to specify the source ip / interface and port of the dns query.

There are however some additionnal requirements to use this feature. Those were ommited due to netifaces requiring python-dev which is not present by default on ubuntu 14.04.

  • sudo apt-get install python-dev # install python header on linux
  • pip install 'netifaces>=0.10.4,<0.11.0' # install netifaces