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Re:Ask HN: What are the best practises for using SSH keys? by sneak on Sunday September 25, 2016 @09:17AM (#12575181)
If you're using key based auth exclusively, you don't need fail2ban.
Re:Ask HN: What are the best practises for using SSH keys? by fail2fail2ban on Sunday September 25, 2016 @11:41AM (#12575771)
fail2ban is for any log you want to monitor and block access to your machine for; not just ssh. fail2ban isn't a "keep my logs clean" tool it's a "reduce my attack surface" tool.

Edit: Feel free to Google "fail2ban security" if you disagree.