[Freeipa-users] DNS Replication Validation

[Petr Spacek]

On 24.9.2015 17:29, Rich Megginson wrote:
> On 09/24/2015 09:24 AM, Aric Wilisch wrote:
>> Is there a way of exporting the DNS information out of Freeipa? Then I could
>> just do a diff on the export from master and replica.
> 
> That's what Martin was suggesting you use dnspython to do.

You can use ldns utils to do that, too.

First of all, allow zone transfers from both servers and save them to a file:

$ dig @server_1 zone.example AXFR > srv1.db
$ dig @server_2 zone.example AXFR > srv2.db
$ ldns-compare-zones -a -s srv1.db srv2.db

In unsigned zones only SOA serial and SOA mname should be different. If the
zone is DNSSEC-signed then there will be a lot of different RRSIG records and
so on, you might experiment with ldns-read-zone -0 or -s to clear the differences.

Also, do not forget to allow zone transfers for IP address of the client
running dig:
$ ipa dnszone-mod --allow-zone-transfer='<ip address of the client>;'

I hope this helps.

Petr^2 Spacek

>>> On Sep 24, 2015, at 11:13 AM, Martin Basti <mbasti at redhat.com> wrote:
>>>
>>>
>>>
>>> On 09/24/2015 05:02 PM, Rich Megginson wrote:
>>>> On 09/24/2015 08:53 AM, Martin Basti wrote:
>>>>>
>>>>> On 09/24/2015 04:43 PM, Rich Megginson wrote:
>>>>>> On 09/24/2015 08:32 AM, Aric Wilisch wrote:
>>>>>>> I need a way to validate that both the primary and the redundant
>>>>>>> FreeIPA server’s DNS zones are in sync. What’s the simplest way for me
>>>>>>> to do this?
>>>>>> Do a DNS query to confirm that the SOA record for the primary is
>>>>>> identical to the SOA for the secondary.
>>>>> SOA serials are not replicated.
>>>> So with IPA you can have a master DNS and a replica DNS that have
>>>> different SOA?
>>> Just SOA serial, other records are replicated.
>>>
>>>> Then the records are replicated using the standard IPA dirsrv replication
>>>> protocol?
>>>>
>>>> In that case, doesn't ipa-replica-manage have a way to ask if the replicas
>>>> are in sync?
>>> I don't think that ipa-replica-manage is capable to detect if replicas are
>>> in sync.
>>> AFAIK this feature is planned for future IPA versions.
>>> Inspecting DS error log may help to find replication issues if any.
>>>
>>> Martin
>>>
>>>>> You can get all  records via AXFR, and compare them per zone.
>>>>>
>>>>> Maybe you can use python-dns to do comparation
>>>>>
>>>>> http://www.dnspython.org/examples.html
>>>> That seems pretty heavyweight if there are a lot records.
>>>>
>>>>> HTH
>>>>> Martin
>>>>>>> My boss won’t let me continue with an upgrade until he’s sure the
>>>>>>> primary and redundant servers have the same DNS records and are in
>>>>>>> sync. I’ve tried finding documentation on this but keep coming up blank.
>>>>>>>
>>>>>>> Thanks in advance.