PowerDNS Recursor

Plugin: go.d.plugin Module: powerdns_recursor

Overview

This collector monitors PowerDNS Recursor instances.

It collects metrics from the internal webserver.

Used endpoints:

/api/v1/servers/localhost/statistics

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.

Setup

Prerequisites

Enable webserver

Follow webserver documentation.

Enable HTTP API

Follow HTTP API documentation.

Configuration

File

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

Options

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

Name	Description	Default	Required
update_every	Data collection frequency.	5	no
autodetection_retry	Recheck interval in seconds. Zero means no recheck will be scheduled.	0	no
url	Server URL.	http://127.0.0.1:8081	yes
timeout	HTTP request timeout.	1	no
username	Username for basic HTTP authentication.		no
password	Password for basic HTTP authentication.		no
proxy_url	Proxy URL.		no
proxy_username	Username for proxy basic HTTP authentication.		no
proxy_password	Password for proxy basic HTTP authentication.		no
method	HTTP request method.	GET	no
body	HTTP request body.		no
headers	HTTP request headers.		no
not_follow_redirects	Redirect handling policy. Controls whether the client follows redirects.	no	no
tls_skip_verify	Server certificate chain and hostname validation policy. Controls whether the client performs this check.	no	no
tls_ca	Certification authority that the client uses when verifying the server’s certificates.		no
tls_cert	Client TLS certificate.		no
tls_key	Client TLS key.		no

Examples

Basic

An example configuration.

jobs:
  - name: local
    url: http://127.0.0.1:8081

HTTP authentication

Basic HTTP authentication.

jobs:
  - name: local
    url: http://127.0.0.1:8081
    username: admin
    password: password

Multi-instance

Note: When you define multiple jobs, their names must be unique.

Local and remote instances.

jobs:
  - name: local
    url: http://127.0.0.1:8081

  - name: remote
    url: http://203.0.113.0:8081

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 PowerDNS Recursor instance

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

Metric	Dimensions	Unit
powerdns_recursor.questions_in	total, tcp, ipv6	questions/s
powerdns_recursor.questions_out	udp, tcp, ipv6, throttled	questions/s
powerdns_recursor.answer_time	0-1ms, 1-10ms, 10-100ms, 100-1000ms, slow	queries/s
powerdns_recursor.timeouts	total, ipv4, ipv6	timeouts/s
powerdns_recursor.drops	over-capacity-drops, query-pipe-full-drops, too-old-drops, truncated-drops, empty-queries	drops/s
powerdns_recursor.cache_usage	cache-hits, cache-misses, packet-cache-hits, packet-cache-misses	events/s
powerdns_recursor.cache_size	cache, packet-cache, negative-cache	entries

Alerts

There are no alerts configured by default for this integration.

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 powerdns_recursor 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 powerdns_recursor
```

Getting Logs

If you’re encountering problems with the powerdns_recursor 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 powerdns_recursor

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 powerdns_recursor /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 powerdns_recursor

Industry

Technology

Use cases