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Miek Gieben 9ac3cab1b7 Make CoreDNS a server type plugin for Caddy (#220) 
* Make CoreDNS a server type plugin for Caddy

Remove code we don't need and port all middleware over. Fix all tests
and rework the documentation.

Also make `go generate` build a caddy binary which we then copy into
our directory. This means `go build`-builds remain working as-is.

And new etc instances in each etcd test for better isolation.
Fix more tests and rework test.Server with the newer support Caddy offers.

Fix Makefile to support new mode of operation.
2016-08-19 17:14:17 -07:00
..
handler.go
middleware/metrics: bug fix in request size
2016-07-04 10:58:24 +00:00
metrics.go
Make CoreDNS a server type plugin for Caddy (#220)
2016-08-19 17:14:17 -07:00
README.md
middleware/monitoring: add more monitoring (#182)
2016-07-04 06:08:45 -04:00
setup.go
Make CoreDNS a server type plugin for Caddy (#220)
2016-08-19 17:14:17 -07:00

README.md

prometheus

This module enables prometheus metrics for CoreDNS. The default location for the metrics is localhost:9153. The metrics path is fixed to /metrics.

The following metrics are exported:

  • coredns_dns_request_count_total{zone, proto, family}
  • coredns_dns_request_duration_milliseconds{zone}
  • coredns_dns_request_size_bytes{zone,, proto}
  • coredns_dns_request_transfer_size_bytes{zone,, proto}
  • coredns_dns_request_do_count_total{zone}
  • coredns_dns_request_type_count_total{zone, type}
  • coredns_dns_response_size_bytes{zone, proto}
  • coredns_dns_response_transfer_size_bytes{zone, proto}
  • coredns_dns_response_rcode_count_total{zone, rcode}

Each counter has a label zone which is the zonename used for the request/response.

Extra labels used are:

  • proto which holds the transport of the response ("udp" or "tcp")
  • The address family (family) of the transport (1 = IP (IP version 4), 2 = IP6 (IP version 6)).
  • type which old the query type, it holds the most common ones (A, AAAA, MX, SOA, CNAME, PTR, TXT, NS, SRV, DS, DNSKEY, RRSIG, NSEC, NSEC3, IXFR, AXFR and ANY) and "other" which lumps together all other types.
  • The response_rcode_count_total has an extra label rcode which holds the rcode of the response.

If monitoring is enabled queries that do not enter the middleware chain are exported under the fake domain "dropped" (without a closing dot).

Restarting CoreDNS will stop the monitoring. This is a bug. Also this upstream Caddy bug.

Syntax

prometheus

For each zone that you want to see metrics for.

It optionally takes an address where the metrics are exported, the default is localhost:9153. The metrics path is fixed to /metrics.

Examples