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CoreDNS

Plugin: go.d.plugin Module: coredns

Overview

This collector monitors CoreDNS instances.

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 CoreDNS instance

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

MetricDimensionsUnit
coredns.dns_request_count_totalrequestsrequests/s
coredns.dns_responses_count_totalresponsesresponses/s
coredns.dns_request_count_total_per_statusprocessed, droppedrequests/s
coredns.dns_no_matching_zone_dropped_totaldroppedrequests/s
coredns.dns_panic_count_totalpanicspanics/s
coredns.dns_requests_count_total_per_protoudp, tcprequests/s
coredns.dns_requests_count_total_per_ip_familyv4, v6requests/s
coredns.dns_requests_count_total_per_per_typea, aaaa, mx, soa, cname, ptr, txt, ns, ds, dnskey, rrsig, nsec, nsec3, ixfr, any, otherrequests/s
coredns.dns_responses_count_total_per_rcodenoerror, formerr, servfail, nxdomain, notimp, refused, yxdomain, yxrrset, nxrrset, notauth, notzone, badsig, badkey, badtime, badmode, badname, badalg, badtrunc, badcookie, otherresponses/s

Per server

These metrics refer to the DNS server.

Labels:

LabelDescription
server_nameServer name.

Metrics:

MetricDimensionsUnit
coredns.server_dns_request_count_totalrequestsrequests/s
coredns.server_dns_responses_count_totalresponsesresponses/s
coredns.server_request_count_total_per_statusprocessed, droppedrequests/s
coredns.server_requests_count_total_per_protoudp, tcprequests/s
coredns.server_requests_count_total_per_ip_familyv4, v6requests/s
coredns.server_requests_count_total_per_per_typea, aaaa, mx, soa, cname, ptr, txt, ns, ds, dnskey, rrsig, nsec, nsec3, ixfr, any, otherrequests/s
coredns.server_responses_count_total_per_rcodenoerror, formerr, servfail, nxdomain, notimp, refused, yxdomain, yxrrset, nxrrset, notauth, notzone, badsig, badkey, badtime, badmode, badname, badalg, badtrunc, badcookie, otherresponses/s

Per zone

These metrics refer to the DNS zone.

Labels:

LabelDescription
zone_nameZone name.

Metrics:

MetricDimensionsUnit
coredns.zone_dns_request_count_totalrequestsrequests/s
coredns.zone_dns_responses_count_totalresponsesresponses/s
coredns.zone_requests_count_total_per_protoudp, tcprequests/s
coredns.zone_requests_count_total_per_ip_familyv4, v6requests/s
coredns.zone_requests_count_total_per_per_typea, aaaa, mx, soa, cname, ptr, txt, ns, ds, dnskey, rrsig, nsec, nsec3, ixfr, any, otherrequests/s
coredns.zone_responses_count_total_per_rcodenoerror, formerr, servfail, nxdomain, notimp, refused, yxdomain, yxrrset, nxrrset, notauth, notzone, badsig, badkey, badtime, badmode, badname, badalg, badtrunc, badcookie, otherresponses/s

Alerts

There are no alerts configured by default for this integration.

Setup

Prerequisites

No action required.

Configuration

File

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

Options

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

All options
NameDescriptionDefaultRequired
update_everyData collection frequency.1no
autodetection_retryRecheck interval in seconds. Zero means no recheck will be scheduled.0no
urlServer URL.http://127.0.0.1:9153/metricsyes
per_server_statsServer filter.no
per_zone_statsZone filter.no
usernameUsername for basic HTTP authentication.no
passwordPassword for basic HTTP authentication.no
proxy_urlProxy URL.no
proxy_usernameUsername for proxy basic HTTP authentication.no
proxy_passwordPassword for proxy basic HTTP authentication.no
timeoutHTTP request timeout.2no
methodHTTP request method.GETno
bodyHTTP request body.no
headersHTTP request headers.no
not_follow_redirectsRedirect handling policy. Controls whether the client follows redirects.nono
tls_skip_verifyServer certificate chain and hostname validation policy. Controls whether the client performs this check.nono
tls_caCertification authority that the client uses when verifying the server's certificates.no
tls_certClient tls certificate.no
tls_keyClient tls key.no
per_server_stats

Metrics of servers matching the selector will be collected.

  • Logic: (pattern1 OR pattern2) AND !(pattern3 or pattern4)
  • Pattern syntax: matcher.
  • Syntax:
per_server_stats:
includes:
- pattern1
- pattern2
excludes:
- pattern3
- pattern4
per_zone_stats

Metrics of zones matching the selector will be collected.

  • Logic: (pattern1 OR pattern2) AND !(pattern3 or pattern4)
  • Pattern syntax: matcher.
  • Syntax:
per_zone_stats:
includes:
- pattern1
- pattern2
excludes:
- pattern3
- pattern4

Examples

Basic

An example configuration.

Config
jobs:
- name: local
url: http://127.0.0.1:9153/metrics

Basic HTTP auth

Local server with basic HTTP authentication.

Config
jobs:
- name: local
url: http://127.0.0.1:9153/metrics
username: foo
password: bar

Multi-instance

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

Collecting metrics from local and remote instances.

Config
jobs:
- name: local
url: http://127.0.0.1:9153/metrics

- name: remote
url: http://203.0.113.10:9153/metrics

Troubleshooting

Debug Mode

To troubleshoot issues with the coredns 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 coredns

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