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Allow debug queries to etcd middleware (#150)

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With this you can retreive the raw data that the etcd middleware
used to create the reply. The debug data is put in TXT records
that are stuffed in the CH classs. This is only enabled if you
specify `debug` in the etcd stanza.

You can retrieve it by prefixing your query with 'o-o.debug.'
For instance:

; <<>> DiG 9.10.3-P4-Ubuntu <<>> @localhost -p 1053 SRV o-o.debug.production.*.skydns.local
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47798
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;o-o.debug.production.*.skydns.local. IN	SRV

;; ANSWER SECTION:
production.*.skydns.local. 154	IN	SRV	10 50 8080 service1.example.com.
production.*.skydns.local. 154	IN	SRV	10 50 8080 service2.example.com.

;; ADDITIONAL SECTION:
skydns.local.skydns.east.production.rails.1. 154 CH TXT	"service1.example.com:8080(10,0,,false)[0,]"
skydns.local.skydns.west.production.rails.2. 154 CH TXT	"service2.example.com:8080(10,0,,false)[0,]"
This commit is contained in:
Miek Gieben
2016-05-22 21:16:26 +01:00
parent d35394a8df
commit c30671f4c0
9 changed files with 323 additions and 62 deletions
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8
middleware/etcd/README.md
View File

@@ -27,6 +27,7 @@ etcd [zones...] {
endpoint endpoint...
upstream address...
tls cert key cacert
debug
}
~~~
@@ -38,6 +39,13 @@ etcd [zones...] {
pointing to external names. If you want CoreDNS to act as a proxy for clients you'll need to add
the proxy middleware.
* `tls` followed the cert, key and the CA's cert filenames.
* `debug` allow debug queries. Prefix the name with `o-o.debug.` to reveive extra information in the
additional section of the reply in the form of text records:
skydns.test.skydns.dom.a. 300 CH TXT "127.0.0.1:0(10,0,,false)[0,]"
This shows the complete key as the owername, the rdata of the TXT record has:
`host:port(priority,weight,txt content,mail)[targetstrip,group]`.
## Examples