[Freeipa-users] DNS configuration
Dmitri Pal
dpal at redhat.com
Mon Dec 8 02:57:09 UTC 2014
On 12/07/2014 09:51 PM, Matthew Herzog wrote:
> What must be done in or on the ipa server with regard to DNS, if
> anything?
>
> Our DNS works. It works well. We have four Linux DNS servers and two
> AD domain controllers that also do DNS.
>
> So if we already have DNS working well in our domain, why do we want
> to manage DNS in IPA?
Let us keep the discussion on the list.
IPA when used with AD trust presents itself as a separate forest. AD
thinks that it is working with another AD forest.
For that to work we need to follow MSFT rules about relationship between
Kerberos realm and DNS domain.
AD assumes that for every trusted forest Kerberos realm = DNS domain.
IPA makes it easy to do because it has integrated tools to manage IPA
DNS domain.
If you want to manage it yourself through your DNS you can do it, just
more manual operations for you.
HTH
Thanks
Dmitri
>
> On Sun, Dec 7, 2014 at 9:44 PM, Dmitri Pal <dpal at redhat.com
> <mailto:dpal at redhat.com>> wrote:
>
> On 12/07/2014 06:44 PM, Matthew Herzog wrote:
>> Thanks guys. I'm sorry for my delay in responding.
>>
>> Firstly, I was under the impression (from reading the docs) that
>> having named running on IPA server was critical.
>
> Properly configured DNS is critical.
> How you accomplish it is up to you.
> IPA allows you to have a DNS server that would simplify DNS
> management but it can be done manually too. This is why DNS is
> optional.
>
>
>> Also, the first question the ipa-server-install script asks is,
>> "Do you want to configure integrated DNS (BIND)? ." While it's
>> true the default answer is no, it leads one to believe that DNS
>> is central to IPA. Also the ipa-client-install script says,
>>
>> [root at freeipa-poc-client02 ~]# ipa-client-install
>> DNS discovery failed to determine your DNS domain
>> Provide the domain name of your IPA server (ex: example.com
>> <http://example.com>):
>>
>> I can resolve -anything- from the machine using dig or whatever.
>>
>> Ultimately, the reason I started to be concerned about my IPA
>> server's DNS config was because I was not able to authenticate AD
>> accounts to a client machine. I saw a bunch of errors in the
>> client's sssd logs which of course I can't find now.
>>
>> Perhaps it was these . . .
>>
>> (Thu Dec 4 13:45:23 2014) [sssd] [ping_check] (0x0100): Service
>> nss replied to ping
>> (Thu Dec 4 13:45:23 2014) [sssd] [ping_check] (0x0100): Service
>> sudo replied to ping
>> (Thu Dec 4 13:45:23 2014) [sssd] [ping_check] (0x0100): Service
>> pam replied to ping
>> (Thu Dec 4 13:45:23 2014) [sssd] [ping_check] (0x0100): Service
>> ssh replied to ping
>> (Thu Dec 4 13:45:23 2014) [sssd] [ping_check] (0x0100): Service
>> pac replied to ping
>> (Thu Dec 4 13:45:23 2014) [sssd] [ping_check] (0x0100): Service
>> bo3.e-bozo.com <http://bo3.e-bozo.com> replied to ping
>>
>> I'm not allowed onto the AD domain controllers to examine log
>> files or I'd be checking those first.
>>
>> So ultimately the goal is to authenticate AD users and users that
>> exist in our ldap schema. We need to set up groups of users that
>> can run sudo commands on specific groups of hosts.
>
> Did you setup trusts as explained on the following page?
> http://www.freeipa.org/page/Howto/IPAv3_AD_trust_setup
>
>
>>
>>
>>
>> On Wed, Dec 3, 2014 at 3:46 AM, Petr Spacek <pspacek at redhat.com
>> <mailto:pspacek at redhat.com>> wrote:
>>
>> On 3.12.2014 04:35, Dmitri Pal wrote:
>> > On 12/02/2014 08:54 PM, Matthew Herzog wrote:
>> >> Any other ideas? I just spun up a new VM and took the
>> defaults on everything
>> >> while running ipa-server-install (the defaults did make
>> sense) and my new VM
>> >> can't resolve -anything- in the domain in which it lives.
>> The "old" VM
>> >> (running the same versions of everything on the same OS)
>> can't even resolve
>> >> the clients I have registered with it!
>> >>
>> >> So I'm pretty frustrated and am wondering, what _exactly_
>> is the role of
>> >> bind in the IPA server and how is it expected to know
>> anything about the
>> >> local DNS domain without becoming a bind slave server?
>> >
>> > I am not sure I am 100% with you but...
>> > If you use the defaults and nothing else you get to the
>> scenario when IPA has
>> > its DNS but it is a self contained environment. It seems
>> that this is what you
>> > observe.
>> > It is expected that you decide in advance what you want to
>> do with DNS. There
>> > are several options:
>> > 1) You can delegate a zone to IPA to manage, then you need
>> to connect your IPA
>> > DNS to your existing DNS during install or after.
>> > In this case the systems joined to IPA will be a part of
>> IPA domain/zone and
>> > would also be able to resolve other systems around
>> > 2) Not use IPA DNS if you do not want to take advantage of it
>> > 3) Have a self contained demo/lab environment that you
>> currently observe.
>> >
>> > What is the intent?
>>
>> I agree with Dmitri, we need more information from you:
>> - You said "my new VM can't resolve -anything- in the domain
>> in which it
>> lives." - Which domain do you mean?
>>
>> - Apparently you have configured FreeIPA to serve zone
>> e-bozo.com <http://e-bozo.com>. Do you have
>> this zone configured on some other DNS server at the same time?
>>
>> Please keep in mind that authoritative servers should share
>> the database. You
>> will get naming collisions if e-bozo.com <http://e-bozo.com>
>> is served by FreeIPA DNS servers and
>> some other servers at the same time. Maybe that is the
>> problem you see right now.
>>
>> As Dmitri said, the architecturally correct solution is to
>> decide if you want
>> to use FreeIPA DNS or not. You have option to either remove
>> non-FreeIPA DNS
>> servers and import data to FreeIPA or to add FreeIPA-specific
>> DNS records to
>> existing DNS servers and do not configure FreeIPA to act as
>> DNS server.
>>
>> Petr^2 Spacek
>>
>> >> Thanks.
>> >>
>> >> On Tue, Dec 2, 2014 at 11:58 AM, Petr Spacek
>> <pspacek at redhat.com <mailto:pspacek at redhat.com>
>> >> <mailto:pspacek at redhat.com <mailto:pspacek at redhat.com>>>
>> wrote:
>> >>
>> >> On 2.12.2014 17:36, Martin Basti wrote:
>> >> > On 02/12/14 17:28, Matthew Herzog wrote:
>> >> >> I just realized that my IPA servers cannot resolve
>> ANY servers
>> >> in my domain.
>> >> >> What do I need to do to fix this? Below is my
>> named.conf.
>> >> >>
>> >> >>
>> >> >> options {
>> >> >> // turns on IPv6 for port 53, IPv4 is on by
>> default for
>> >> all ifaces
>> >> >> listen-on-v6 {any;};
>> >> >>
>> >> >> // Put files that named is allowed to write
>> in the
>> >> data/ directory:
>> >> >> directory "/var/named"; // the default
>> >> >> dump-file "data/cache_dump.db";
>> >> >> statistics-file "data/named_stats.txt";
>> >> >> memstatistics-file "data/named_mem_stats.txt";
>> >> >>
>> >> >> forward first;
>> >> >> forwarders {
>> >> >> 10.100.8.41;
>> >> >> 10.100.8.40;
>> >> >> 10.100.4.13;
>> >> >> 10.100.4.14;
>> >> >> 10.100.4.19;
>> >> >> 10.100.4.44;
>> >> >> };
>> >> >>
>> >> >> // Any host is permitted to issue recursive
>> queries
>> >> >> allow-recursion { any; };
>> >> >>
>> >> >> tkey-gssapi-keytab "/etc/named.keytab";
>> >> >> pid-file "/run/named/named.pid";
>> >> >> };
>> >> >>
>> >> >> /* If you want to enable debugging, eg. using the
>> 'rndc trace'
>> >> command,
>> >> >> * By default, SELinux policy does not allow named
>> to modify
>> >> the /var/named
>> >> >> directory,
>> >> >> * so put the default debug log file in data/ :
>> >> >> */
>> >> >> logging {
>> >> >> channel default_debug {
>> >> >> file "data/named.run";
>> >> >> severity dynamic;
>> >> >> print-time yes;
>> >> >> };
>> >> >> };
>> >> >> };
>> >> >>
>> >> >> zone "." IN {
>> >> >> type hint;
>> >> >> file "named.ca <http://named.ca>
>> <http://named.ca> <http://named.ca>";
>> >> >> };
>> >> >>
>> >> >> include "/etc/named.rfc1912.zones";
>> >> >>
>> >> >> dynamic-db "ipa" {
>> >> >> library "ldap.so";
>> >> >> arg "uri
>> >> ldapi://%2fvar%2frun%2fslapd-BO3-E-BOZO-COM.socket";
>> >> >> arg "base cn=dns, dc=bo3,dc=e-bozo,dc=com";
>> >> >> arg "fake_mname
>> freeipa-poc01.bo3.e-bozo.com
>> <http://freeipa-poc01.bo3.e-bozo.com>
>> >> <http://freeipa-poc01.bo3.e-bozo.com>
>> >> >> <http://freeipa-poc01.bo3.e-bozo.com>.";
>> >> >> arg "auth_method sasl";
>> >> >> arg "sasl_mech GSSAPI";
>> >> >> arg "sasl_user
>> DNS/freeipa-poc01.bo3.e-bozo.com
>> <http://freeipa-poc01.bo3.e-bozo.com>
>> >> <http://freeipa-poc01.bo3.e-bozo.com>
>> >> >> <http://freeipa-poc01.bo3.e-bozo.com>";
>> >> >> arg "serial_autoincrement yes";
>> >> >> };
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> > Hello,
>> >> >
>> >> > which version ipa do you use? which platform? Which
>> version
>> >> bind-dyndb-ldap?
>> >> >
>> >> > Can you run these commands, and check if there any
>> errors?
>> >> > ipactl status
>> >> > systemctl status named (respectively journalctl -u
>> named)
>> >>
>> >> We also may want to see information listed on page
>> >> https://fedorahosted.org/bind-dyndb-ldap/wiki/BugReporting
>>
>> --
>> Manage your subscription for the Freeipa-users mailing list:
>> https://www.redhat.com/mailman/listinfo/freeipa-users
>> Go To http://freeipa.org for more info on the project
>>
>>
>>
>>
>> --
>> If life gives you melons, you may be dyslexic.
>>
>>
>
>
> --
> Thank you,
> Dmitri Pal
>
> Sr. Engineering Manager IdM portfolio
> Red Hat, Inc.
>
>
> --
> Manage your subscription for the Freeipa-users mailing list:
> https://www.redhat.com/mailman/listinfo/freeipa-users
> Go To http://freeipa.org for more info on the project
>
>
>
>
> --
> If life gives you melons, you may be dyslexic.
--
Thank you,
Dmitri Pal
Sr. Engineering Manager IdM portfolio
Red Hat, Inc.
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