On 22.7.2014 00:13, Mark Heslin wrote:
Hi All,

I had some off-list exchanges with Petr Spacek on this but am still trying to
work out the correct syntax.
I have 2 hosts:

    - foo1.example.com
    - foo2.example.com

and would like to create a round-robin DNS srv record for both called

I already have DNS entries for both hosts in IPA:

   # ipa dnsrecord-show example.com foo1
     Record name: foo1
     A record:
   # ipa dnsrecord-show example.com foo2
     Record name: foo2
     A record:

I'd like to get the correct syntax for adding the srv record for foo.
My understanding is that it should be something like this:

   # ipa dnsrecord-add example.com _foo.tcp --srv-rec="0 50 53 foo1.example.com"
   Record name: _foo.tcp
   SRV record: 0 50 53 foo1.example.com
   # ipa dnsrecord-add example.com _foo.tcp --srv-rec="0 50 53 foo2.example.com"
   Record name: _foo.tcp
   SRV record: 0 50 53 foo2.example.com

which seemed to be added ok but on second glance I think not:

   # host -t srv _foo.tcp.example.com
   _foo.tcp..example.com has SRV record 0 50 53 foo1.example.com.example.com.
   _foo.tcp..example.com has SRV record 0 50 53 foo2.example.com.example.com.

In looking over the description of rfc2782
<http://en.wikipedia.org/wiki/SRV_record> it appears the IPA syntax is a
little different,

I don't think so :-)

Please note the trailing dot in "target" part of http://en.wikipedia.org/wiki/SRV_record#Record_format.

IPA behaves in the same way as BIND 9: All domain names without trailing dot are automatically extended with zone origin, i.e. "example.com.".

You have two options:
# ipa dnsrecord-add example.com _foo.tcp --srv-rec="0 50 53 foo1" (DNS server will automatically append "example.com.")


# ipa dnsrecord-add example.com _foo.tcp --srv-rec="0 50 53 foo1.example.com."
(please note the trailing dot)

Another note is about "_foo". "foo" should be "service name" according to

It will probably not cause any problems if you invent your own name (preferably prefixed with x- to avoid collisions in future, e.g. "_x-foo"), but it will not hurt you if you register your protocol into the registry :-)
See http://tools.ietf.org/html/rfc6335

and the documentation is scarce so admittedly I'm taking a swag at this ;-)

I can do this fine without srv but don't have enough familiarity with DNS srv
Can anyone help clarify what I'm missing? I'd like to have equal weighting,
to both hosts - I'm assuming the port (53) is correct for DNS here as well.
What are you trying to achieve? The port number refers to port used by your application, not to DNS.

Petr^2 Spacek

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