FQDN

FQDN lookups can be potentially cause latency issues, we only recommend to use this within the Postoverflow whitelist stage see introduction for your OS specific path

Create the whitelist with fully qualified domaine name

You might want to whitelist a fully qualified domain name (FQDN eg foo.com), in that case you need to follow this below

Let's create the following file FQDN-whitelists.yaml (See introduction for your OS specific path) :

name: me/FQDN-whitlists
description: "Whitelist postoverflows from FQDN"
whitelist:
  reason: "do whitelistings by FQDN"
  expression:
    - evt.Overflow.Alert.Source.IP in LookupHost("foo.com")
    - evt.Overflow.Alert.Source.IP in LookupHost("foo.foo.org")
    - evt.Overflow.Alert.Source.IP in LookupHost("12123564.org")

Save and reload CrowdSec before to test

Reload CrowdSec

sudo systemctl reload crowdsec