dns-srv-records.md

DNS SRV Records

By default confd will try and connect to etcd at http://127.0.0.1:4001. To connect to a different set of etcd nodes you can use the -node flag on the command line:

confd -node http://etcd0.example.com:4001 -node http://etcd1.example.com:4001

Or via the etcd_nodes configuration option in the confd configuration file, i.e. /etc/confd/confd.toml.

etcd_nodes = [
  "http://etcd0.example.com:4001",
  "http://etcd1.example.com:4001",
]

As of confd version 0.2.0 you can specify a DNS domain name to query for etcd SRV records via the -srv-domain flag. Assuming the following SRV records exist:

 dig SRV _etcd._tcp.confd.io

... 
;; ANSWER SECTION:
_etcd._tcp.confd.io.  300 IN  SRV 1 50 4001 etcd0.confd.io.
_etcd._tcp.confd.io.  300 IN  SRV 2 50 4001 etcd1.confd.io.

confd -onetime -verbose -srv-domain confd.io

Output

2013-11-03T19:04:53-08:00 confd[21356]: INFO SRV domain set to confd.io
2013-11-03T19:04:53-08:00 confd[21356]: NOTICE Starting confd
2013-11-03T19:04:53-08:00 confd[21356]: NOTICE etcd nodes set to http://etcd0.confd.io:4001, http://etcd1.confd.io:4001
2013-11-03T19:04:54-08:00 confd[21356]: INFO /tmp/myconf2.conf has md5sum ae5c061f41de8895b6ef70803de9a455 should be 50d4ce679e1cf13e10cd9de90d258996
2013-11-03T19:04:54-08:00 confd[21356]: INFO Target config /tmp/myconf2.conf out of sync
2013-11-03T19:04:54-08:00 confd[21356]: INFO Target config /tmp/myconf2.conf has been updated 

By default the etcd-scheme will be set to http. If you would like to use https instead use the -etcd-scheme flag

confd -onetime -verbose -srv-domain confd.io -etcd-scheme https

Both the SRV domain and etcd scheme can be configured in the confd configuration file. See the Configuration Guide for more details.