kea-exporter

Prometheus Exporter for the ISC Kea DHCP Server.

From v0.4.0 on Kea >=1.3.0 is required, as the configuration, specifically subnet information, will be read from the control socket.

Installation

The latest stable version can always be installed from PyPi:

$ pip install kea-exporter

and upgraded with:

$ pip install --upgrade kea-exporter

Docker

A docker image is available and can be configured with environment variables see usage section

$ docker pull ghcr.io/mweinelt/kea-exporter

Features

• DHCP4 & DHCP6 Metrics (tested against Kea 2.4.1)
• Configuration and statistics via control socket or http api

Currently not working:

• Automatic config reload (through inotify)

Known Limitations

The following features are not supported yet, help is welcome.

• Shared Networks
• Custom Subnet Identifiers

Usage

Pass one or multiple Unix Domain Socket path or HTTP Control-Agent URLs to the kea-exporter executable. All other options are optional.

Usage: python -m kea_exporter [OPTIONS] TARGETS...

Options:
  -a, --address TEXT      Address that the exporter binds to.
  -p, --port INTEGER      Port that the exporter binds to.
  -i, --interval INTEGER  Minimal interval between two queries to Kea in
                          seconds.
  --client-cert PATH      Path to client certificate used to in HTTP requests
  --client-key PATH       Path to client key used in HTTP requests
  --version               Show the version and exit.
  --help                  Show this message and exit.

You can also configure the exporter using environment variables:

export ADDRESS="0.0.0.0"
export PORT="9547"
export INTERVAL="7.5"
export TARGETS="http://router.example.com:8000"
export CLIENT_CERT="/etc/kea-exporter/client.crt"
export CLIENT_KEY="/etc/kea-exporter/client.key"

Configure Control Socket

The exporter uses Kea's control socket to request both configuration and statistics. Consult the documentation on how to set up the control socket:

• https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html#management-api-for-the-dhcpv4-server
• https://kea.readthedocs.io/en/latest/arm/dhcp6-srv.html#management-api-for-the-dhcpv6-server

HTTPS

If you need to validate a self-signed certificate on a Kea instance, you can set REQUESTS_CA_BUNDLE environment variable to a bundle CA path.

Permissions

Kea Exporter needs to be able to read and write on the socket, hence it's permissions might need to be modified accordingly.

Grafana-Dashboard

A dashboard for this exporter is available at https://grafana.com/grafana/dashboards/12688.