README.md

prometheus-nftables-collector

This Textfile Collector for Prometheus Node Exporter exports named counters, meters, maps and sets from the Nftables ruleset to Prometheus.

Requirements

You need python3.7 or newer to run the collector script and obviously nft (tested with v0.9.0).

Setup

install -D -m 755 ./collector.py /usr/share/prometheus-node-exporter/nftables.py
install -D -t /etc/systemd/system ./prometheus-node-exporter-nftables.service ./prometheus-node-exporter-nftables.timer
systemctl enable --now prometheus-node-exporter-nftables.timer

Example

Nftables ruleset

table ip filter {
  counter http-allowed {
  }

  counter http-denied {
  }

  chain input {
    type filter hook input priority 0
    policy drop
    tcp dport { 80, 443 } meter http-limit { ip saddr limit rate over 16 mbytes/second } counter name http-denied drop
    tcp dport { 80, 443 } counter name http-allowed accept
  }
}

Resulting metrics

nftables_counter_bytes{family="ip", name="http-allowed", table="filter", handle="17"} 90576
nftables_counter_packets{family="ip", name="http-allowed", table="filter", handle="17"} 783
nftables_counter_bytes{family="ip", name="http-denied", table="filter", handle="20"} 936
nftables_counter_packets{family="ip", name="http-denied", table="filter", handle="20"} 13
nftables_meter_element_count{family="ip", name="http-limit", table="filter", type="ipv4_addr", handle="34"} 3