fail2ban

Fail2ban works by filtering a log file with a regular expression triggering a ban action if the condition is met. After a preset time, it will trigger an unban action. Without much effort, we can have WordPress log all authentication events and have fail2ban react on them.

If your fail2ban is on a host behind a Rackspace Cloud LoadBalancer, you’ll want to block the offending IP addresses directly in your LoadBalancer. If your LB is acting as a reverse proxy, you’ll HAVE to block in the LB, but it is also nice to protect all other nodes behind the LB and offload the lifting.