Good tip on the pub/priv key auth for ssh. Also on tripwire. Thanks! Custom logs generated by your own app for things like login attempts, etc, are definitely

Good tip on the pub/priv key auth for ssh. Also on tripwire. Thanks! Custom logs generated by your own app for things like login attempts, etc, are definitely useful for detecting issues. I was referring more to things like apache connection logs, and other logs generated by other programs - I would imagine that there's a huge range of things to look for.