ISC DHCP

Plugin: go.d.plugin Module: isc_dhcpd

Overview

This collector monitors ISC DHCP lease usage by reading the DHCP client lease database (dhcpd.leases).

This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.

Default Behavior

Auto-Detection

This integration doesn't support auto-detection.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per ISC DHCP instance

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

Metric	Dimensions	Unit
isc_dhcpd.active_leases_total	active	leases
isc_dhcpd.pool_active_leases	a dimension per DHCP pool	leases
isc_dhcpd.pool_utilization	a dimension per DHCP pool	percentage

Alerts

There are no alerts configured by default for this integration.

Setup

Prerequisites

No action required.

Configuration

File

The configuration file name for this integration is go.d/isc_dhcpd.conf.

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/isc_dhcpd.conf

Options

The following options can be defined globally: update_every, autodetection_retry.

Config options

Name	Description	Default	Required
update_every	Data collection frequency.	1	no
autodetection_retry	Recheck interval in seconds. Zero means no recheck will be scheduled.	0	no
leases_path	Path to DHCP client lease database.	/var/lib/dhcp/dhcpd.leases	no
pools	List of IP pools to monitor.		yes

pools

List of IP pools to monitor.

• IP range syntax: see supported formats.
• Syntax:

pools:
  - name: "POOL_NAME1"
    networks: "SPACE SEPARATED LIST OF IP RANGES"
  - name: "POOL_NAME2"
    networks: "SPACE SEPARATED LIST OF IP RANGES"

Examples

Basic

A basic example configuration.

Config

jobs:
  - name: local
    pools:
      - name: lan
        networks: "192.168.0.0/24 192.168.1.0/24 192.168.2.0/24"
      - name: wifi
        networks: "10.0.0.0/24"

Troubleshooting

Debug Mode

To troubleshoot issues with the isc_dhcpd collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

• Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

  cd /usr/libexec/netdata/plugins.d/

• Switch to the netdata user.

  sudo -u netdata -s

• Run the go.d.plugin to debug the collector:

  ./go.d.plugin -d -m isc_dhcpd