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117 lines
3.6 KiB
Groff
117 lines
3.6 KiB
Groff
.\" Generated by Mmark Markdown Processer - mmark.miek.nl
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.TH "COREDNS-METRICS" 7 "October 2020" "CoreDNS" "CoreDNS Plugins"
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.SH "NAME"
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.PP
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\fIprometheus\fP - enables Prometheus
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\[la]https://prometheus.io/\[ra] metrics.
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.SH "DESCRIPTION"
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.PP
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With \fIprometheus\fP you export metrics from CoreDNS and any plugin that has them.
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The default location for the metrics is \fB\fClocalhost:9153\fR. The metrics path is fixed to \fB\fC/metrics\fR.
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The following metrics are exported:
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.IP \(bu 4
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\fB\fCcoredns_build_info{version, revision, goversion}\fR - info about CoreDNS itself.
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.IP \(bu 4
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\fB\fCcoredns_panics_total{}\fR - total number of panics.
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.IP \(bu 4
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\fB\fCcoredns_dns_requests_total{server, zone, proto, family, type}\fR - total query count.
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.IP \(bu 4
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\fB\fCcoredns_dns_request_duration_seconds{server, zone, type}\fR - duration to process each query.
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.IP \(bu 4
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\fB\fCcoredns_dns_request_size_bytes{server, zone, proto}\fR - size of the request in bytes.
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.IP \(bu 4
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\fB\fCcoredns_dns_do_requests_total{server, zone}\fR - queries that have the DO bit set
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.IP \(bu 4
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\fB\fCcoredns_dns_response_size_bytes{server, zone, proto}\fR - response size in bytes.
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.IP \(bu 4
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\fB\fCcoredns_dns_responses_total{server, zone, rcode}\fR - response per zone and rcode.
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.IP \(bu 4
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\fB\fCcoredns_plugin_enabled{server, zone, name}\fR - indicates whether a plugin is enabled on per server and zone basis.
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.PP
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Each counter has a label \fB\fCzone\fR which is the zonename used for the request/response.
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.PP
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Extra labels used are:
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.IP \(bu 4
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\fB\fCserver\fR is identifying the server responsible for the request. This is a string formatted
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as the server's listening address: \fB\fC<scheme>://[<bind>]:<port>\fR. I.e. for a "normal" DNS server
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this is \fB\fCdns://:53\fR. If you are using the \fIbind\fP plugin an IP address is included, e.g.: \fB\fCdns://127.0.0.53:53\fR.
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.IP \(bu 4
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\fB\fCproto\fR which holds the transport of the response ("udp" or "tcp")
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.IP \(bu 4
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The address family (\fB\fCfamily\fR) of the transport (1 = IP (IP version 4), 2 = IP6 (IP version 6)).
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.IP \(bu 4
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\fB\fCtype\fR which holds the query type. It holds most common types (A, AAAA, MX, SOA, CNAME, PTR, TXT,
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NS, SRV, DS, DNSKEY, RRSIG, NSEC, NSEC3, IXFR, AXFR and ANY) and "other" which lumps together all
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other types.
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.PP
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If monitoring is enabled, queries that do not enter the plugin chain are exported under the fake
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name "dropped" (without a closing dot - this is never a valid domain name).
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.PP
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This plugin can only be used once per Server Block.
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.SH "SYNTAX"
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.PP
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.RS
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.nf
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prometheus [ADDRESS]
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.fi
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.RE
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.PP
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For each zone that you want to see metrics for.
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.PP
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It optionally takes a bind address to which the metrics are exported; the default
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listens on \fB\fClocalhost:9153\fR. The metrics path is fixed to \fB\fC/metrics\fR.
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.SH "EXAMPLES"
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.PP
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Use an alternative listening address:
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.PP
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.RS
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.nf
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\&. {
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prometheus localhost:9253
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}
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.fi
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.RE
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.PP
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Or via an environment variable (this is supported throughout the Corefile): \fB\fCexport PORT=9253\fR, and
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then:
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.PP
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.RS
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.nf
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\&. {
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prometheus localhost:{$PORT}
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}
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.fi
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.RE
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.SH "BUGS"
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.PP
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When reloading, the Prometheus handler is stopped before the new server instance is started.
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If that new server fails to start, then the initial server instance is still available and DNS queries still served,
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but Prometheus handler stays down.
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Prometheus will not reply HTTP request until a successful reload or a complete restart of CoreDNS.
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Only the plugins that register as Handler are visible in \fB\fCcoredns_plugin_enabled{server, zone, name}\fR. As of today the plugins reload and bind will not be reported.
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