[Samba] Linux Servers in an AD Domain with Multiple Windows Domain Controllers

[Robinson, Eric]

On 27 May 2013 19:14, Robinson, Eric <eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>> wrote:
> -----Original Message-----
> From: Marc Muehlfeld [mailto:samba at marc-muehlfeld.de<mailto:samba at marc-muehlfeld.de>]
> Sent: Saturday, May 25, 2013 3:31 PM
> To: Robinson, Eric
> Cc: samba at lists.samba.org<mailto:samba at lists.samba.org>
> Subject: Re: [Samba] Linux Servers in an AD Domain with
> Multiple Windows Domain Controllers
>
> Hello Eric,
>
> Am 25.05.2013 18<tel:25.05.2013%2018>:29, schrieb Robinson, Eric:
> > We have three Windows domain controllers in our AD domain. They are
>  > DC01, DC02, and DC03. We have Linux (RHEL5 and 6) servers
> in the  > domain as well. The Linux servers are working fine
> with AD. However,  > they are currently configured in
> krb.conf and krb5.conf to use only  > DC01 for AD domain
> controller. if DC01 is down, Linux servers cannot  >
> authenticate. How do we configure the Linux servers to use
> multiple  > domain controllers for AD, so if DC01 is down
> everything continues  > to work on the Linux side?
>
> I saw, that you asked that question already 1.5 years ago on
> this list:
> http://markmail.org/message/slugpbka33ap4ima
>
> Didn't the two suggestions from Marcel and Andrew work? If
> not, what were the problems with them? Then maybe we find a
> way to get it work.
>
> Regards,
> Marc
>

Hi Marc -- Thanks very much for following up on this. I did try Marcel and Andrew's suggestions (see below) but it did not work. When server DC01 is down, Windows users can still login fine, but when I try to ssh to a Linux box, the login hangs for a long time or forever. Also, Marcel and Andrew did not address my follow-up question about the krb.conf file. They only mentioned the krb5.conf file.

For reference, my krb.conf looks like this...

MYCHARTS.MD<http://MYCHARTS.MD>     dc01.mycharts.md:88<http://dc01.mycharts.md:88>
MYCHARTS.MD<http://MYCHARTS.MD>     dc01.mycharts.md:749<http://dc01.mycharts.md:749> admin server

My krb5.conf looks like the following... note the second entry for the DC named TS04.

[logging]
 default = FILE:/var/log/krb5libs.log
 kdc = FILE:/var/log/krb5kdc.log
 admin_server = FILE:/var/log/kadmind.log

[libdefaults]
 default_realm = MYCHARTS.MD<http://MYCHARTS.MD>
 dns_lookup_realm = true
 dns_lookup_kdc = true

[realms]
 MYCHARTS.MD<http://MYCHARTS.MD> = {
  kdc = dc01.mycharts.md:88<http://dc01.mycharts.md:88>
  kdc = ts04.mycharts.md:88<http://ts04.mycharts.md:88>
  admin_server = dc01.mycharts.md:749<http://dc01.mycharts.md:749>
  kpasswd_server = dc01.mycharts.md:464<http://dc01.mycharts.md:464>
  kpasswd_protocol = SET_CHANGE
  #default_domain = example.com<http://example.com>
 }

[domain_realm]
 *.mycharts.md<http://mycharts.md> = MYCHARTS.MD<http://MYCHARTS.MD>
 .mycharts.md<http://mycharts.md> = MYCHARTS.MD<http://MYCHARTS.MD>

[kdc]
 profile = /var/kerberos/krb5kdc/kdc.conf

[appdefaults]
 pam = {
   debug = false
   ticket_lifetime = 36000
   renew_lifetime = 36000
   forwardable = true
   krb4_convert = false
 }

--Eric




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