Dnsmasq DHCP collector

Dnsmasq is a lightweight, easy to configure, DNS forwarder and DHCP server.

This module monitors Dnsmasq DHCP leases database.

Metrics

All metrics have "dnsmasq_dhcp." prefix.

Labels per scope:

• dhcp range: dhcp_range.

Metric	Scope	Dimensions	Units
dhcp_ranges	global	ipv4, ipv6	ranges
dhcp_hosts	global	ipv4, ipv6	hosts
dhcp_range_utilization	dhcp range	used	percentage
dhcp_range_allocated_leases	dhcp range	allocated	leases

Auto-detection

Module automatically detects all configured dhcp-ranges reading dnsmasq configuration files.

By default it uses:

• /var/lib/misc/dnsmasq.leases to read leases.
• /etc/dnsmasq.conf to detect dhcp-ranges.
• /etc/dnsmasq.d to find additional configurations.

Configuration

Edit the go.d/dnsmasq_dhcp.conf configuration file using edit-config from the Netdata config directory, which is typically at /etc/netdata.

cd /etc/netdata # Replace this path with your Netdata config directory
sudo ./edit-config go.d/dnsmasq_dhcp.conf

Here is an example:

jobs:
  - name: dnsmasq_dhcp
    leases_path: /var/lib/misc/dnsmasq.leases
    conf_path: /etc/dnsmasq.conf
    conf_dir: /etc/dnsmasq.d

For all available options please see module configuration file.

Troubleshooting

To troubleshoot issues with the dnsmasq_dhcp 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 dnsmasq_dhcp