Archive for February, 2009

Feb 28 2009

A new fish species named psychedelica –> movie shot of this new species

Published by under Leisure,tidbits

This new fish species looks really alien. I was amazed how much variety we have in our oceans.  

                                             

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Feb 14 2009

Perl script to do Dynamic DNS update for the domains hosted at NearlyFreeSpeech.net [NFS.N]

Published by under general

If your domains are hosted at Nearlyfreespeech.net and if the  webserver for one of your sub-domains  is hosted on your home machine, then you need to update your sub-domain’s DNS info with the current IP address info. This is normally called as Dynamic DNS update. NFS.N provides a set of API’s to access  their DNS services to update the DNS information. I have created a simple perl script that does the Dynamic DNS update to NFS.N DNS servers.

How to use this script

1) Pre-requisites

Perl ( Perl 5 and above should work. Mine is Perl 5.8 )

Perl Modules:

WebService::NFSN;  LWP::Simple;  XML::Simple;  Data::Dumper;  Text::Trim;

You can install all the above mentioned modules via CPAN.

NFS.N Credentials

username ( This is the name you use to log into NFS.N website )

API auth Key. ( If you don’t have it , raise a secure support request at NFS.N support website. They will mail you the key )

2) Download the script into your home directory. The  script is available here

3) on the command prompt type, updateIP.pl username your-API-Auth-Key your-domain-name ttl_value name sub-domain-name type    A

( All the bold words as it is )

for example, your user name is jonny, your API auth key is XYSDGFGJHK , your domain name is jonny.net, ttl_value is 600 and sub-domain-name is home_server, then the command will be

updateIP.pl jonny  XYSDGFGJHK   jonny.net  600   name   home_server   type    A

4) You need to run this periodically. You can run a corn job that executes the above periodically. Recommended interval is 10 mins.

Acknowledgement

This script is based on a TTL_Value update script from C.J.Madsen. Infact, hs is the one who wrote Webservice::NFSN.

Additional Note:

NFS.N services requires that the time difference between your home server and its servers are not more than 5 secs. If it is , then the authentication step will result in error and hence you will not be able to update. The most reliable way to keep the time of your home server in sync with NFS.N server is to update your home server’s time using Network Time Protocol.  pool.ntp.org is a global , distributed NTP time servers that i use for keeping my server’s time in synch with NFS.N. And I do this once a day.

Here is the  command. You need to run this as root.

ntpdate  pool.ntp.org

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