[Freeipa-users] FW: named and IpA
Petr Spacek
pspacek at redhat.com
Mon Oct 6 07:57:04 UTC 2014
Hello,
let me summarize the environment so we can be sure that I understood it correctly:
- there are (at least) two non-IPA DNS servers 16.112.240.27 and 16.112.240.40
- non-IPA servers are authoritative for DNS zone osn.cxo.cpqcorp.net
- IPA server is *also* configured to be authoritative for DNS zone
osn.cxo.cpqcorp.net (as shown by ipa dnszone-find command).
I hope that this summary is correct, please let me know if it doesn't.
This configuration cannot reliably work because there is a clash between sets
of authoritative servers. IPA server claim authority over domain
osn.cxo.cpqcorp.net (set 1) and at the same time non-IPA servers (set 2) deem
themselves to be authoritative for domain osn.cxo.cpqcorp.net.
Unfortunately IPA installer is not clever enough to detect this situation and
warn you at the right time. We have a ticket for adding this check to new
versions of IPA.
https://fedorahosted.org/freeipa/ticket/3681
The solution is to decide which set of servers (IPA or non-IPA) should be
really authoritative and change configuration appropriately.
If you want to use non-IPA servers as authoritative:
- Install IPA *without* DNS component
- Add required DNS records generated by IPA installed to non-IPA servers.
If you want to use IPA server as authoritative:
- Install IPA with DNS component
- Remove DNS zones from non-IPA servers or change configuration so non-IPA
servers are *slaves* of IPA
- Change NS records in parent zone (presumably cxo.cpqcorp.net) so they point
to IPA.
Don't hesitate to ask if you have further questions.
Petr^2 Spacek
On 3.10.2014 17:13, Licause, Al (CSC AMS BCS - UNIX/Linux Network Support) wrote:
> -----Original Message-----
> From: freeipa-users-bounces at redhat.com [mailto:freeipa-users-bounces at redhat.com] On Behalf Of Petr Spacek
> Sent: Friday, October 03, 2014 1:26 AM
> To: freeipa-users at redhat.com
> Subject: Re: [Freeipa-users] named and IpA
>
> On 2.10.2014 19:05, Licause, Al (CSC AMS BCS - UNIX/Linux Network Support) wrote:
>> We have IdM running on a RHEL V7 system and have configured a local
>> DNS server in our test lab.
>>
>> We have loaded the various SRV and TXT records needed by the IdM server.
>>
>>
>> PROBLEM:
>>
>> >From the IdM server we can only lookup local records. The name
>>> resolver will not
>> attempt to look to another other name servers or domains defined in
>> /etc/resolv.conf
>>
>> If I shutdown IdM using ipactl stop and then restart named, the name
>> resolver works for local and remote hosts, addresses and domains as
>> well as serving up the SRV records defined on the local host.
>>
>> Am I correct in assuming that while IdM is up and running, the only
>> other systems it will communicate with at least with regard to name
>> services is another host also running IdM defined either as a server or a client ?
>>
>> If this is case, is there anyone to better integrate some of these
>> common services such as named into an existing network such that you are not limited by the IdM components ?
>
> I would like to get additional information about your environment:
> - Is the IPA server is installed with DNS or not? Did you use option --setup-dns during ipa-server-install?
>
>>> I have tried it both ways, but the most current in which we see this behavior I ran ipa-server-install with
>>> no arguments and said yes to the question about installing DNS. I then replied with two valid forwarders.
>>> In a previous installation, we added two of our local zones from one of the other dns server
>>> and then added the sample zone provided by the installation which contained the various SRV and TXT
>>> records. But for current reporting of this problem, we did not add/load the other zone files.
>
> - Which DNS zones do you have defined on IPA server? You can use command "ipa dnszone-find" to list all zones.
>
> [root at linux named]# ipa dnsconfig-mod --forwarder=16.112.240.27;16.112.240.40
> ipa: ERROR: no modifications to be performed
> bash: 16.112.240.40: command not found...
> [root at linux named]# ipa dnszone-find
> Zone name: 240.112.16.in-addr.arpa.
> Authoritative nameserver: linux.osn.cxo.cpqcorp.net.
> Administrator e-mail address: hostmaster.osn.cxo.cpqcorp.net.
> SOA serial: 1412344406
> SOA refresh: 3600
> SOA retry: 900
> SOA expire: 1209600
> SOA minimum: 3600
> Active zone: TRUE
> Allow query: any;
> Allow transfer: none;
>
> Zone name: osn.cxo.cpqcorp.net
> Authoritative nameserver: linux.osn.cxo.cpqcorp.net.
> Administrator e-mail address: hostmaster.osn.cxo.cpqcorp.net.
> SOA serial: 1412344406
> SOA refresh: 3600
> SOA retry: 900
> SOA expire: 1209600
> SOA minimum: 3600
> Active zone: TRUE
> Allow query: any;
> Allow transfer: none;
> ----------------------------
> Number of entries returned 2
> ----------------------------
>
> - Is there any other DNS servers serving same DNS zones?
>
>>> Yes....we left the other two existing DNS servers in place as they are our primary name servers for this lab segment.
>>> Those are the two systems we have entered as forwarders.
>
> - Did you configure forwarders in /etc/named.conf or via ipa command line tools (ipa dnsconfig-mod or --forwarder option during ipa-server-install)?
>
>>> The forwarders were placed in the /etc/named.conf file by the ipa-server-install script or one of its subordinate scripts
>>> I did try entering the forward policy and forwarders using ipa dnsconfig-mod but they didn't seem to change the behavior.
>>> One thing I did notice was that ipa dnsconfig-mod --forwarder= only allowed one forwarder to be entered.....adding
>>> a second entry on the line resulted in an error. If entered with a second --forwarders command, the previous forwarder
>>> was replaced by the new one. So if there is a particular syntax that would allow more than one entry, can you please
>>> post same ?
>
> - Please attach result of DNS lookups using "dig" command: One output when it doesn't work (i.e. with IPA running) and the other when it works as you expect (i.e. after "ipactl stop" and "service named restart").
>
>>> with ipa running:
>
> [root at linux named]# nslookup dl160a.osn.cxo.cpqcorp.net
> Server: 16.112.240.59
> Address: 16.112.240.59#53
>
> ** server can't find dl160a.osn.cxo.cpqcorp.net: NXDOMAIN
>
> [root at linux named]# dig dl160a.osn.cxo.cpqcorp.net
>
> ; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> dl160a.osn.cxo.cpqcorp.net
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 6571
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
>
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 4096
> ;; QUESTION SECTION:
> ;dl160a.osn.cxo.cpqcorp.net. IN A
>
> ;; AUTHORITY SECTION:
> osn.cxo.cpqcorp.net. 3600 IN SOA linux.osn.cxo.cpqcorp.net. hostmaster.osn.cxo.cpqcorp.net. 1412344406 3600 900 1209600 3600
>
> ;; Query time: 1 msec
> ;; SERVER: 16.112.240.59#53(16.112.240.59)
> ;; WHEN: Fri Oct 03 11:08:35 EDT 2014
> ;; MSG SIZE rcvd: 108
>
>
> [root at linux named]# ipactl stop
> Stopping Directory Service
> Stopping ipa-otpd Service
> Stopping pki-tomcatd Service
> Stopping httpd Service
> Stopping ipa_memcached Service
> Stopping named Service
> Stopping kadmin Service
> Stopping krb5kdc Service
> ipa: INFO: The ipactl command was successful
>
> [root at linux named]# systemctl start named
> [root at linux named]#
> [root at linux named]#
> [root at linux named]# dig dl160a.osn.cxo.cpqcorp.net
>
> ; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> dl160a.osn.cxo.cpqcorp.net
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28446
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 4
>
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 4096
> ;; QUESTION SECTION:
> ;dl160a.osn.cxo.cpqcorp.net. IN A
>
> ;; ANSWER SECTION:
> dl160a.osn.cxo.cpqcorp.net. 43200 IN A 16.112.240.191
>
> ;; AUTHORITY SECTION:
> osn.cxo.cpqcorp.net. 43200 IN NS cluster.osn.cxo.cpqcorp.net.
> osn.cxo.cpqcorp.net. 43200 IN NS win2008.osn.cxo.cpqcorp.net.
> osn.cxo.cpqcorp.net. 43200 IN NS denali.osn.cxo.cpqcorp.net.
>
> ;; ADDITIONAL SECTION:
> win2008.osn.cxo.cpqcorp.net. 43200 IN A 16.112.240.55
> cluster.osn.cxo.cpqcorp.net. 43200 IN A 16.112.240.27
> denali.osn.cxo.cpqcorp.net. 43200 IN A 16.112.240.40
>
> ;; Query time: 4 msec
> ;; SERVER: 16.112.240.59#53(16.112.240.59)
> ;; WHEN: Fri Oct 03 11:10:54 EDT 2014
> ;; MSG SIZE rcvd: 184
--
Petr^2 Spacek
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