Behind Load Balancer?

I actually got this working myself, following this guide somewhat: https://www.michelem.org/2014/08/01/nginx-fail2ban-blocking-ip-behind-aws-load-balancer/

One gotcha is that his script is missing the <ip> sent with the script command, so it should be more something like:

actionban = <iptables> -I f2b-<name> 1 -s <ip> -j <blocktype>
			/etc/fail2ban/ban-deny-nginx.sh ban <ip>

And also, I had to set the IP of my LB for set_real_ip_from in the nginx conf. Other than those issues, it works a treat!