Dnsmasq DHCP
Dnsmasq DHCP
Plugin: go.d.plugin Module: dnsmasq_dhcp
Overview
This collector monitors Dnsmasq DHCP leases databases, depending on your configuration.
By default, it uses:
/var/lib/misc/dnsmasq.leasesto read leases./etc/dnsmasq.confto detect dhcp-ranges./etc/dnsmasq.dto find additional configurations.
This collector is only supported on the following platforms:
- Linux
This collector only supports collecting metrics from a single instance of this integration.
Default Behavior
Auto-Detection
All configured dhcp-ranges are detected automatically
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.
Setup
Prerequisites
No action required.
Configuration
File
The configuration file name for this integration is go.d/dnsmasq_dhcp.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/dnsmasq_dhcp.conf
Options
The following options can be defined globally: update_every, autodetection_retry.
| 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 dnsmasq DHCP leases file. | /var/lib/misc/dnsmasq.leases | no |
| conf_path | Path to dnsmasq configuration file. | /etc/dnsmasq.conf | no |
| conf_dir | Path to dnsmasq configuration directory. | /etc/dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new | no |
Examples
Basic
An example configuration.
jobs:
- name: dnsmasq_dhcp
leases_path: /var/lib/misc/dnsmasq.leases
conf_path: /etc/dnsmasq.conf
conf_dir: /etc/dnsmasq.d
Pi-hole
Dnsmasq DHCP on Pi-hole.
jobs:
- name: dnsmasq_dhcp
leases_path: /etc/pihole/dhcp.leases
conf_path: /etc/dnsmasq.conf
conf_dir: /etc/dnsmasq.d
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 Dnsmasq DHCP instance
These metrics refer to the entire monitored application.
This scope has no labels.
Metrics:
| Metric | Dimensions | Unit |
|---|---|---|
| dnsmasq_dhcp.dhcp_ranges | ipv4, ipv6 | ranges |
| dnsmasq_dhcp.dhcp_hosts | ipv4, ipv6 | hosts |
Per dhcp range
These metrics refer to the DHCP range.
Labels:
| Label | Description |
|---|---|
| dhcp_range | DHCP range in START_IP:END_IP format |
Metrics:
| Metric | Dimensions | Unit |
|---|---|---|
| dnsmasq_dhcp.dhcp_range_utilization | used | percentage |
| dnsmasq_dhcp.dhcp_range_allocated_leases | allocated | leases |
Alerts
The following alerts are available:
| Alert name | On metric | Description |
|---|---|---|
| dnsmasq_dhcp_dhcp_range_utilization | dnsmasq_dhcp.dhcp_range_utilization | DHCP range utilization |
Troubleshooting
Debug Mode
Important: Debug mode is not supported for data collection jobs created via the UI using the Dyncfg feature.
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.ddirectory, usually at/usr/libexec/netdata/plugins.d/. If that’s not the case on your system, opennetdata.confand look for thepluginssetting under[directories].cd /usr/libexec/netdata/plugins.d/ -
Switch to the
netdatauser.sudo -u netdata -s -
Run the
go.d.pluginto debug the collector:./go.d.plugin -d -m dnsmasq_dhcp
Getting Logs
If you’re encountering problems with the dnsmasq_dhcp collector, follow these steps to retrieve logs and identify potential issues:
- Run the command specific to your system (systemd, non-systemd, or Docker container).
- Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.
System with systemd
Use the following command to view logs generated since the last Netdata service restart:
journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep dnsmasq_dhcp
System without systemd
Locate the collector log file, typically at /var/log/netdata/collector.log, and use grep to filter for collector’s name:
grep dnsmasq_dhcp /var/log/netdata/collector.log
Note: This method shows logs from all restarts. Focus on the latest entries for troubleshooting current issues.
Docker Container
If your Netdata runs in a Docker container named “netdata” (replace if different), use this command:
docker logs netdata 2>&1 | grep dnsmasq_dhcp