powerdyn

Installation

Clone the git repository, there is no real installation yet.

Configuration

Edit powerdyn.conf and adjust the domain and database credentials to match your environment.

domain can have the special value auto (or be absent) to trigger autodetection of the domain. Autodetection is implemented as stripping the first part of the FQDN passed as hostname.

Usage

Add the following to the ~/.ssh/authorized_keys of the user:

no-agent-forwarding,no-port-forwarding,no-pty,no-X11-forwarding,no-user-rc,command="/usr/local/bin/powerdyn host.powerdyn.example.com" ssh-rsa <SOMESSHKEY>

Add the following to the crontab on the machine you want the dynamic DNS for:

*/5 * * * * ssh -4 -T -i /home/user/.ssh/powerdyn_rsa [email protected]
*/5 * * * * ssh -6 -T -i /home/user/.ssh/powerdyn_rsa [email protected]

If your IPv6 address does not change, just remove the -6 line. powerdyn won't touch the AAAA record then.