My ongoing experiences with Ubuntu, and later Mythbuntu, as a media center with MythTV. I'm also using the system for a virtual machine server, a mediawiki server and a general all around home infrastructure base.

Tuesday, May 26, 2009

DynDNS false alarm

I previously set up automatic updating of DynDNS. Today I got an email warning me "Your account vwelch at DynDNS.com is due to expire in 5 days."

Hmmm, I'd seen this problem before. So I logged into my server, but no hung ddclient processes:

% ps auxwww | grep ddclient
%


Hmmm, poking around some more, looks like the problem maybe fixed itself?

%grep ddclient /var/log/daemon.log
May 25 08:21:48 casey ddclient[13892]: WARNING: forcing update of Home from 98.222.63.70 to 98.222.63.70; 30 days since last update on Fri Apr 24 21:31:51 2009.
May 25 08:21:48 casey ddclient[13892]: WARNING: forcing update of vwelch.dyndns.org from 98.222.63.70 to 98.222.63.70; 30 days since last update on Fri Apr 24 21:31:51 2009.
May 25 08:21:50 casey ddclient[13892]: SUCCESS: updating Home: good: IP address set to 98.222.63.70
May 25 08:21:50 casey ddclient[13892]: SUCCESS: updating vwelch.dyndns.org: good: IP address set to 98.222.63.70


Sure enough, logging into DynDNS showed a last update time from this morning.

So apparently there is a race condition between the email warning and the ddclient forcing a refresh.
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