Just a quick little note, I've set up a repository containing the rough ideas and templates behind automating a deploy of Nagios using Ansible and making it pretty easy to get a monitoring infrastructure up and running, and a quick little bit of structure to make it easy to add monitoring tasks to existing deployment playbooks.
Feel free to extend it or pull request it to tell me if what I'm doing is horribly Off-Base and Wrong™.
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Ryan is one of the storers of stories and infrastructure wonks at Storehouse, building the future of interactive storytelling and making sure the servers don't fall over in the process. He contributes to a bunch of Free Software projects, as well, including KDE and the Fedora Project.