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Dnsmasq DHCP monitoring with Netdata

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.

MetricScopeDimensionsUnits
dhcp_rangesglobalipv4, ipv6ranges
dhcp_hostsglobalipv4, ipv6hosts
dhcp_range_utilizationdhcp_rangeusedpercentage
dhcp_range_allocated_leasesdhcp_rangeallocatedleases

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

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