DNS query

Plugin: go.d.plugin Module: dns_query

Overview

This module monitors DNS query round-trip time (RTT).

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 server

These metrics refer to the DNS server.

Labels:

Label	Description
server	DNS server address.
network	Network protocol name (tcp, udp, tcp-tls).
record_type	DNS record type (e.g. A, AAAA, CNAME).

Metrics:

Metric	Dimensions	Unit
dns_query.query_status	success, network_error, dns_error	status
dns_query.query_time	query_time	seconds

Alerts

The following alerts are available:

Alert name	On metric	Description
dns_query_query_status	dns_query.query_status	DNS request type ${label:record_type} to server ${label:server} is unsuccessful

Setup

Prerequisites

No action required.

Configuration

File

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

The file format is YAML. Generally, the structure is:

update_every: 1
autodetection_retry: 0
jobs:
  - name: some_name1
  - name: some_name1

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/dns_query.conf

Options

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

All 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
domains	Domain or subdomains to query. The collector will choose a random domain from the list on every iteration.		yes
servers	Servers to query. If empty, the collector will automatically use DNS servers from /etc/resolv.conf.		no
port	DNS server port.	53	no
network	Network protocol name. Available options: udp, tcp, tcp-tls.	udp	no
record_types	Query record type. Available options: A, AAAA, CNAME, MX, NS, PTR, TXT, SOA, SPF, TXT, SRV.	A	no
timeout	Query read timeout.	2	no

Examples

Specific DNS servers

An example configuration using Google's public DNS servers.

Config

jobs:
  - name: job1
    record_types:
      - A
      - AAAA
    domains:
      - google.com
      - github.com
      - reddit.com
    servers:
      - 8.8.8.8
      - 8.8.4.4

System DNS

An example configuration using DNS servers from /etc/resolv.conf.

Config

jobs:
  - name: job1
    record_types:
      - A
      - AAAA
    domains:
      - google.com
      - github.com
      - reddit.com

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 dns_query 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 dns_query

Getting Logs

If you're encountering problems with the dns_query 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 dns_query

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 dns_query /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 dns_query