= DNSBL exporter

Provides an exporter to scan known DNSBL-providers for listing of target-IP.

== Installation

1. You have to installed `ruby` and `bundler`:
+
[source,sh]
----
apt install ruby
gem install bundler
----

2. Clone the repository to the destination, you want to have installed dnsbl_exporter.

3. Copy `config.yml.example` to `config.yml` and change settings like resolver.

4. Start on boot:
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[source,sh]
----
useradd prometheus
sudo -u prometheus bundle install
erb dnsbl_exporter.service.erb > /etc/systemd/system/dnsbl_exporter.service
systemctl daemon-reload
systemctl enable --now dnsbl_exporter.service
----

5. In prometheus, define the target-IP as `target`-param.
+
[source,yaml]
----
- job_name: dnsbl4
  static_configs:
  - targets:
    - '1.2.3.4'
    - '1234::abcd'
  relabel_configs:
  - source_labels: [__address__]
    target_label: __param_target
    replacement: '${1}'
  - source_labels: [__param_target]
    target_label: instance
  - target_label: __address__
    replacement: {{prometheus_jobs_dnsbl_target}}
----