Use a cloud DNS provider like a dynamic dns service. A Ruby executable to stick in a crontab. If the excellent fog supports the service, cloud-dyndns will (probably) work for you.

gem install cloud-dyndns

cloud-dyndns --config ~/$your_yaml_file

where $your_yaml_file is the path to a file that looks like:

:credentials:
  :provider: 'AWS'
  :aws_secret_access_key: 'your-secretkeykeykey'
  :aws_access_key_id: 'your-access-id'
:zones:
  - :domain: "looting.biz"
    :targets:
      - "phl.looting.biz"
      - "*.phl.looting.biz"
  - :domain: "narf.io"
    :targets:
      - "phl.narf.io"
      - "*.phl.narf.io"

there's -c/--config and -l/--log:

• --config is mandatory: a path to your config file
• --log is optional: if not given it will log to stdout. if given a path it will log to that file.

*/15 * * * * cloud-dyndns --config /Users/nat/.cloud-dyndns.yml >> ~/.cdyndns.log

will make sure your domain is up to date every 15 minutes, and will log to ~/.cdyndns.log

If you use rbenv, rvm, or rb-john-wanamaker...I'm not sure what you can do. I vaguely remember with rvm you could create "wrappers". I know it's possible to use software the way you might want. Sorry I'm not more helpful here.

I refactored this and added tests for release. I've been using it for about a year. Fog is good, contributions welcome.

bundle install --without development

rake test

This will allow running tests on ruby >= 1.9.2

bundle install --without nothing

(See this SO post about why I suggest just throwing that --without nothing in there.

bundle exec guard

Development requires Ruby >= 1.9.3 due to the listen gem's requirement of Ruby 1.9.3.

• allow setting of hostmaster email?
• allow usage of a different wtfismyip-type service?
• use a version of fog that requires only 1.8.7?
  • this would include adding a fix for this issue in this library.