DNS query
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.
Setup
Prerequisites
No action required.
Configuration
File
The configuration file name for this integration is go.d/dns_query.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/dns_query.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 |
| domains | Domain or subdomains to query. The collector will choose a random domain from the list on every iteration. | yes | |
| servers | Servers to query. | yes | |
| 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
Basic
An example configuration.
jobs:
- name: job1
record_types:
- A
- AAAA
domains:
- google.com
- github.com
- reddit.com
servers:
- 8.8.8.8
- 8.8.4.4
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 ${label:server} is unsuccessful |
Troubleshooting
Debug Mode
To troubleshoot issues with the dns_query collector, run the go.d.plugin with the debug option enabled. The output
should give you clues as to why the collector isn’t working.
-
Navigate to the
plugins.ddirectory, usually at/usr/libexec/netdata/plugins.d/. If that’s not the case on your system, opennetdata.confand look for thepluginssetting under[directories].cd /usr/libexec/netdata/plugins.d/ -
Switch to the
netdatauser.sudo -u netdata -s -
Run the
go.d.pluginto debug the collector:./go.d.plugin -d -m dns_query
Getting Logs
If you’re encountering problems with the dns_query collector, follow these steps to retrieve logs and identify potential issues:
- Run the command specific to your system (systemd, non-systemd, or Docker container).
- Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.
System with systemd
Use the following command to view logs generated since the last Netdata service restart:
journalctl _SYSTEMD_INVOCATION_ID="$(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