src/go/collectors/go.d.plugin/modules/coredns/integrations/coredns.md
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# CoreDNS
<img src="https://netdata.cloud/img/coredns.svg" width="150"/>
Plugin: go.d.plugin
Module: coredns
<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />
## 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:
| Metric | Dimensions | Unit |
|:------|:----------|:----|
| coredns.dns_request_count_total | requests | requests/s |
| coredns.dns_responses_count_total | responses | responses/s |
| coredns.dns_request_count_total_per_status | processed, dropped | requests/s |
| coredns.dns_no_matching_zone_dropped_total | dropped | requests/s |
| coredns.dns_panic_count_total | panics | panics/s |
| coredns.dns_requests_count_total_per_proto | udp, tcp | requests/s |
| coredns.dns_requests_count_total_per_ip_family | v4, v6 | requests/s |
| coredns.dns_requests_count_total_per_per_type | a, aaaa, mx, soa, cname, ptr, txt, ns, ds, dnskey, rrsig, nsec, nsec3, ixfr, any, other | requests/s |
| coredns.dns_responses_count_total_per_rcode | noerror, formerr, servfail, nxdomain, notimp, refused, yxdomain, yxrrset, nxrrset, notauth, notzone, badsig, badkey, badtime, badmode, badname, badalg, badtrunc, badcookie, other | responses/s |
### Per server
These metrics refer to the DNS server.
Labels:
| Label | Description |
|:-----------|:----------------|
| server_name | Server name. |
Metrics:
| Metric | Dimensions | Unit |
|:------|:----------|:----|
| coredns.server_dns_request_count_total | requests | requests/s |
| coredns.server_dns_responses_count_total | responses | responses/s |
| coredns.server_request_count_total_per_status | processed, dropped | requests/s |
| coredns.server_requests_count_total_per_proto | udp, tcp | requests/s |
| coredns.server_requests_count_total_per_ip_family | v4, v6 | requests/s |
| coredns.server_requests_count_total_per_per_type | a, aaaa, mx, soa, cname, ptr, txt, ns, ds, dnskey, rrsig, nsec, nsec3, ixfr, any, other | requests/s |
| coredns.server_responses_count_total_per_rcode | noerror, formerr, servfail, nxdomain, notimp, refused, yxdomain, yxrrset, nxrrset, notauth, notzone, badsig, badkey, badtime, badmode, badname, badalg, badtrunc, badcookie, other | responses/s |
### Per zone
These metrics refer to the DNS zone.
Labels:
| Label | Description |
|:-----------|:----------------|
| zone_name | Zone name. |
Metrics:
| Metric | Dimensions | Unit |
|:------|:----------|:----|
| coredns.zone_dns_request_count_total | requests | requests/s |
| coredns.zone_dns_responses_count_total | responses | responses/s |
| coredns.zone_requests_count_total_per_proto | udp, tcp | requests/s |
| coredns.zone_requests_count_total_per_ip_family | v4, v6 | requests/s |
| coredns.zone_requests_count_total_per_per_type | a, aaaa, mx, soa, cname, ptr, txt, ns, ds, dnskey, rrsig, nsec, nsec3, ixfr, any, other | requests/s |
| coredns.zone_responses_count_total_per_rcode | noerror, formerr, servfail, nxdomain, notimp, refused, yxdomain, yxrrset, nxrrset, notauth, notzone, badsig, badkey, badtime, badmode, badname, badalg, badtrunc, badcookie, other | responses/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](https://github.com/netdata/netdata/blob/master/docs/netdata-agent/configuration/README.md#the-netdata-config-directory).
```bash
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.
<details><summary>All options</summary>
| 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 |
| url | Server URL. | http://127.0.0.1:9153/metrics | yes |
| per_server_stats | Server filter. | | no |
| per_zone_stats | Zone filter. | | 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 |
| timeout | HTTP request timeout. | 2 | 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 |
##### per_server_stats
Metrics of servers matching the selector will be collected.
- Logic: (pattern1 OR pattern2) AND !(pattern3 or pattern4)
- Pattern syntax: [matcher](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/pkg/matcher#supported-format).
- Syntax:
```yaml
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](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/pkg/matcher#supported-format).
- Syntax:
```yaml
per_zone_stats:
includes:
- pattern1
- pattern2
excludes:
- pattern3
- pattern4
```
</details>
#### Examples
##### Basic
An example configuration.
<details><summary>Config</summary>
```yaml
jobs:
- name: local
url: http://127.0.0.1:9153/metrics
```
</details>
##### Basic HTTP auth
Local server with basic HTTP authentication.
<details><summary>Config</summary>
```yaml
jobs:
- name: local
url: http://127.0.0.1:9153/metrics
username: foo
password: bar
```
</details>
##### Multi-instance
> **Note**: When you define multiple jobs, their names must be unique.
Collecting metrics from local and remote instances.
<details><summary>Config</summary>
```yaml
jobs:
- name: local
url: http://127.0.0.1:9153/metrics
- name: remote
url: http://203.0.113.10:9153/metrics
```
</details>
## 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]`.
```bash
cd /usr/libexec/netdata/plugins.d/
```
- Switch to the `netdata` user.
```bash
sudo -u netdata -s
```
- Run the `go.d.plugin` to debug the collector:
```bash
./go.d.plugin -d -m coredns
```