Monitor hosting environment for spam keywords

What environment-independent tools are available to detect new spam blogs or comments appearing on a hosting infrastructure?

As an occasional hosting provider, we want to watch for new blogs or comments which appear spammy, but avoid relying on plugins or modules开发者_高级运维 in the CMS environment (because these are easy to circumvent, or expose only to Google).

A (pseudo) example would be to set up Google Alert for "viagra ip:10.0.0.1", where 10.0.0.1 is the front-facing IP of the servers. (Google doesn't offer such an advanced operator term though ...)

Seems I'm looking for a combination of Nagios + Google Alerts + ( ??? ) ... what does fill this space?

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I would setup an hourly cronjob that wgets the entire website then greps the resulting files for whatever spam strings you're looking for an alerts on a hit. Let me know if you'd like me to hack up a quick example, or if thats not the direction you were thinking.