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crowdsec
CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Use the builtin fail2ban's cloudflare plugin (https://github.com/fail2ban/fail2ban/blob/master/config/action.d/cloudflare.conf)
While fail2ban is a great tool there are other ways to deal with various attacks if you're using Cloudflare. One is CrowdSec which enables you to do L7 anti-DDoS for free :-) The extraordinary thing with CrowdSec is that it uses collaborative threat intelligence. In human speak this means that all users share anonymous information on the attacks they're seeing with the crowd meaning that all users help each other out.