Key expiration helper
Key expiration for services can come as a surprise, unless you are prepared. It might be worthwhile to consider a helpful warning procedure to keep people on their toes. Perhaps a cronjob that regularly checks the configured host keys and send an email to someone (root by default, otherwise configurable) to alert them that the key is about to expire, and some helpful pointers about how to extend that expiration.
(from redmine: created on 2010-05-06)
Edited by John Scott