coredns

README

CoreDNS monitoring with Netdata

CoreDNS is a fast and flexible DNS server.

This module monitor one or more CoreDNS instances depending on configuration.

Charts

It produces the following summary charts:

• Number Of DNS Requests in requests/s
• Number Of DNS Responses in responses/s
• Number Of Processed And Dropped DNS Requests in requests/s
• Number Of Dropped DNS Requests Because Of No Matching Zone in requests/s
• Number Of Panics in panics/s
• Number Of DNS Requests Per Transport Protocol in requests/s
• Number Of DNS Requests Per IP Family in requests/s
• Number Of DNS Requests Per Type in requests/s
• Number Of DNS Responses Per Rcode in responses/s

Per server charts (if configured):

• Number Of DNS Requests in requests/s
• Number Of DNS Responses in responses/s
• Number Of Processed And Dropped DNS Requests in requests/s
• Number Of DNS Requests Per Transport Protocol in requests/s
• Number Of DNS Requests Per IP Family in requests/s
• Number Of DNS Requests Per Type in requests/s
• Number Of DNS Responses Per Rcode in responses/s

Per zone charts (if configured):

• Number Of DNS Requests in requests/s
• Number Of DNS Responses in responses/s
• Number Of DNS Requests Per Transport Protocol in requests/s
• Number Of DNS Requests Per IP Family in requests/s
• Number Of DNS Requests Per Type in requests/s
• Number Of DNS Responses Per Rcode in responses/s

Configuration

Edit the go.d/coredns.conf configuration file using edit-config from the Netdata config directory, which is typically at /etc/netdata.

cd /etc/netdata # Replace this path with your Netdata config directory
sudo ./edit-config go.d/coredns.conf

The module needs only the url to a CoreDNS metrics-address. Here is an example for several instances:

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

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

For all available options, please see the module's configuration file.

Troubleshooting

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.

First, navigate to your plugins directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the setting plugins directory. Once you're in the plugin's directory, switch to the netdata user.

cd /usr/libexec/netdata/plugins.d/
sudo -u netdata -s

You can now run the go.d.plugin to debug the collector:

./go.d.plugin -d -m coredns

Documentation

Index

• type Chart
• type Charts
• type Config
• type CoreDNS
  • func New() *CoreDNS
  • func (cd CoreDNS) Charts() *Charts
  • func (cd CoreDNS) Check() bool
  • func (CoreDNS) Cleanup()
  • func (cd *CoreDNS) Collect() map[string]int64
  • func (cd *CoreDNS) Init() bool
• type Dim
• type Dims

Types

type Chart

type Chart = module.Chart

Chart is an alias for module.Chart

type Charts

type Charts = module.Charts

Charts is an alias for module.Charts

type Config

type Config struct {
	web.HTTP       `yaml:",inline"`
	PerServerStats matcher.SimpleExpr `yaml:"per_server_stats"`
	PerZoneStats   matcher.SimpleExpr `yaml:"per_zone_stats"`
}

Config is the CoreDNS module configuration.

type CoreDNS

type CoreDNS struct {
	module.Base
	Config `yaml:",inline"`
	// contains filtered or unexported fields
}

CoreDNS CoreDNS module.

func New

func New() *CoreDNS

New creates CoreDNS with default values.

func (CoreDNS) Charts

func (cd CoreDNS) Charts() *Charts

Charts creates Charts.

func (CoreDNS) Check

func (cd CoreDNS) Check() bool

Check makes check.

func (CoreDNS) Cleanup

func (CoreDNS) Cleanup()

Cleanup makes cleanup.

func (*CoreDNS) Collect

func (cd *CoreDNS) Collect() map[string]int64

Collect collects metrics.

func (*CoreDNS) Init

func (cd *CoreDNS) Init() bool

Init makes initialization.

type Dim

type Dim = module.Dim

Dim is an alias for module.Dim

type Dims

type Dims = module.Dims

Dims is an alias for module.Dims