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ISC dhcpd Leases Prometheus Exporter

A Prometheus exporter for the ISC dhcpd server. This exporter consumes the dhcpd.leases file (man page) which is periodically written by the dameon. It is based on the node_exporter and cf_exporter projects.

Installation

Binaries

Download the already existing binaries for your platform:

$ ./dhcpd_leases_exporter <flags>

From source

Using the standard go install (you must have Go already installed in your local machine):

$ go install github.com/DRuggeri/dhcpd_leases_exporter
$ dhcpd_leases_exporter <flags>

With Docker

An official scratch-based Docker image is built with every tag and pushed to DockerHub and ghcr. Additionally, PRs will be tested by GitHubs actions.

The following images are available for use:

Usage

Flags

usage: dhcpd_leases_exporter [<flags>]

Flags:
  -h, --help              Show context-sensitive help (also try --help-long and --help-man).
      --dhcpd.leases="/var/lib/dhcp/dhcpd.leases"
                          Path of the dhcpd.leases file. Defaults to '/var/lib/dhcp/dhcpd.leases' ($DHCPD_LEASES_EXPORTER_LEASES_FILE)
      --filter.collectors="Stats,Leases"
                          Comma separated collectors to enable (Stats) ($DHCPD_LEASES_EXPORTER_FILTER_COLLECTORS)
      --metrics.namespace="dhcpd_leases"
                          Metrics Namespace ($DHCPD_LEASES_EXPORTER_METRICS_NAMESPACE)
      --web.listen-address=":9198"
                          Address to listen on for web interface and telemetry ($DHCPD_LEASES_EXPORTER_WEB_LISTEN_ADDRESS)
      --web.telemetry-path="/metrics"
                          Path under which to expose Prometheus metrics ($DHCPD_LEASES_EXPORTER_WEB_TELEMETRY_PATH)
      --web.auth.username=WEB.AUTH.USERNAME
                          Username for web interface basic auth ($DHCPD_LEASES_EXPORTER_WEB_AUTH_USERNAME)
      --web.tls.cert_file=WEB.TLS.CERT_FILE
                          Path to a file that contains the TLS certificate (PEM format). If the certificate is signed by a certificate authority, the file should be the concatenation of the server's certificate, any intermediates, and the CA's certificate
                          ($DHCPD_LEASES_EXPORTER_WEB_TLS_CERTFILE)
      --web.tls.key_file=WEB.TLS.KEY_FILE
                          Path to a file that contains the TLS private key (PEM format) ($DHCPD_LEASES_EXPORTER_WEB_TLS_KEYFILE)
      --printMetrics      Print the metrics this exporter exposes and exits. Default: false ($DHCPD_LEASES_EXPORTER_PRINT_METRICS)
      --log.level="info"  Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal]
      --log.format="logger:stderr"
                          Set the log target and format. Example: "logger:syslog?appname=bob&local=7" or "logger:stdout?json=true"
      --version           Show application version.

Metrics

Stats

This collector counts the number of leases PER UNIQUE IP found in dhcpd.leases. This means that if an IP was leased to client X, but is now leased to client Y, there will be only one entry counted (the most recent one). This is in line with how dhcpd reads the file.

  dhcpd_leases_stats_valid - The number of leases in dhcpd.leases that have not yet expired
  dhcpd_leases_stats_expired - The number of leases in dhcpd.leases that have xpired
  dhcpd_leases_stats_count - The number of leases in dhcpd.leases
  dhcpd_leases_stats_scrapes_total - Total number of scrapes
  dhcpd_leases_stats_scrape_errors_total - Total number of scrapes errors
  dhcpd_leases_stats_last_scrape_error - Whether the last scrape of stats resulted in an error (1 for error, 0 for success).
  dhcpd_leases_stats_last_scrape_timestamp - Number of seconds since 1970 since last scrape of stat metrics.

Leases

This collector will create a vector gague for each client with an active DHCP lease found in dhcpd.leases. Because this collector may produce tons of short-lived vectors depending on how busy DHCPD is, it is disabled by default

  dhcpd_leases_active_client - The number of leases in dhcpd.leases that have not yet expired
  dhcpd_leases_active_scrapes_total - Total number of scrapes
  dhcpd_leases_active_scrape_errors_total - Total number of scrapes errors
  dhcpd_leases_active_last_scrape_error - Whether the last scrape resulted in an error (1 for error, 0 for success).
  dhcpd_leases_active_last_scrape_timestamp - Number of seconds since 1970 since last scrape.

Contributing

Refer to the contributing guidelines.

License

Apache License 2.0, see LICENSE.

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A Prometheus exporter for the ISC dhcpd daemon's dhcpd.leases file

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