Nice post, don't know if you've mentioned it, but it's also important that you don't run your cronjobs as root. I always did that in the past and as one of my servers had a firewall problem recently I was able to break into my own server as I just had to rewrite and upload a little script that got executed as root every few minutes. So I've seen for the first time how easy it could be to break into a server. Always run cronjobs as a normal user if possible, not as root.
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