This is an extremely simple tool to update CloudFlare dynamic DNS entries. It's sole purpose is to periodically query the external IP address of the machine it is running on, and modify the DNS entry accordingly. Opposed to a few scripts out there that do a one shot update requiring regular cron sheduling, this one is more aimed to environments where you can configure it as a service and leave the updater running in the background.
The tool in written in Go and follows the usual installation method:
$ go get github.com/karalabe/cloudflare-dyndns
$ cloudflare-dyndns --help
Usage of cloudflare-dyndns:
-domains string
Comma separated domain list to update
-key string
CloudFlare authorization token
-ttl int
Domain time to live value (default 120)
-update duration
Time interval to run the updater (default 1m0s)
-user string
CloudFlare username to update with
The CloudFlare updater is available as a Docker container too in the form of a Docker Hub automated build. To use it, simply pull the images and start with the same flags you would use for the standalone version.
$ docker pull karalabe/cloudflare-dyndns
$ docker run -d --restart=always karalabe/cloudflare-dyndns [...]
Above we've also set a restart policy to always start up the DNS updates even in the face of complete machine reboots.