Years ago, we had multiple servers across multiple cloud providers, and every time the IP address of one of those servers changed, we'd have to manually update our firewalls to reflect that change.
Our servers had ways to detect bad actors and add them to a blocklist, but we didn't have a way to globally distribute that blocklist across all of our servers.
So we create 'dog', a distributed firewall management system that works across providers, scales to hundreds+ of servers, and quickly and securely does it's job.
We'd love to hear what you think of dog, and would love even more for you to use, fix, and extend it.
Want to see how software is eating the walkie-talkie? Checkout https://relaypro.com.
ipython is something I miss when I use any other language's shell. Amazing Ruby doesn't have something nearly as good (well, there is a hack: http://nbviewer.ipython.org/gist/minrk/4689728)