Michael Mercier wrote:

On 2012-09-07, at 2:47 PM, Dmitri Pal wrote:

On 09/07/2012 12:42 PM, Michael Mercier wrote:
On 2012-09-07, at 12:14 PM, Dmitri Pal wrote:

On 09/06/2012 10:40 AM, Michael Mercier wrote:
Hello,

I have experienced some odd connectivity issues using MMR with FreeIPA (all 
systems CentOS 6.3).  I have 2 ipa servers (ipaserver / ipaserver2) setup using 
MMR.

[root@ipaserver ~]#ipa-replica-manage list
ipaserver.mpls.local: master
ipaserver2.mpls.local: master
[root@ipaserver ~]# rpm -qa|grep ipa
libipa_hbac-1.8.0-32.el6.x86_64
ipa-admintools-2.2.0-16.el6.x86_64
ipa-server-2.2.0-16.el6.x86_64
ipa-pki-ca-theme-9.0.3-7.el6.noarch
libipa_hbac-python-1.8.0-32.el6.x86_64
ipa-client-2.2.0-16.el6.x86_64
ipa-server-selinux-2.2.0-16.el6.x86_64
ipa-pki-common-theme-9.0.3-7.el6.noarch
python-iniparse-0.3.1-2.1.el6.noarch
ipa-python-2.2.0-16.el6.x86_64


[root@ipaserver2 ~]#ipa-replica-manage list
ipaserver.mpls.local: master
ipaserver2.mpls.local: master
[root@ipaserver2 ~]# rpm -qa|grep ipa
ipa-client-2.2.0-16.el6.x86_64
ipa-server-2.2.0-16.el6.x86_64
ipa-pki-ca-theme-9.0.3-7.el6.noarch
ipa-python-2.2.0-16.el6.x86_64
libipa_hbac-1.8.0-32.el6.x86_64
python-iniparse-0.3.1-2.1.el6.noarch
libipa_hbac-python-1.8.0-32.el6.x86_64
ipa-admintools-2.2.0-16.el6.x86_64
ipa-server-selinux-2.2.0-16.el6.x86_64
ipa-pki-common-theme-9.0.3-7.el6.noarch


[mike@ipaclient ~]$ rpm -qa|grep ipa
ipa-admintools-2.2.0-16.el6.x86_64
python-iniparse-0.3.1-2.1.el6.noarch
ipa-python-2.2.0-16.el6.x86_64
libipa_hbac-python-1.8.0-32.el6.x86_64
ipa-client-2.2.0-16.el6.x86_64
libipa_hbac-1.8.0-32.el6.x86_64


I have a webserver (zenoss) using kerberos authentication.

[root@zenoss ~]# rpm -qa|grep ipa
libipa_hbac-1.8.0-32.el6.x86_64
libipa_hbac-python-1.8.0-32.el6.x86_64
ipa-python-2.2.0-16.el6.x86_64
ipa-client-2.2.0-16.el6.x86_64
python-iniparse-0.3.1-2.1.el6.noarch
ipa-admintools-2.2.0-16.el6.x86_64

<Location />
  SSLRequireSSL
  AuthType Kerberos
  AuthName "Kerberos Login"

  KrbMethodK5Passwd Off
  KrbAuthRealms MPLS.LOCAL
  KrbSaveCredentials on
  KrbServiceName HTTP
  Krb5KeyTab /etc/http/conf.d/http.keytab

  AuthLDAPUrl "ldap://ipaserver.mpls.local 
ipaserver2.mpls.local/dc=mpls,dc=local?krbPrincipalName"
  RequestHeader set X_REMOTE_USER %{remoteUser}e
  require ldap-group cn=zenuser,cn=groups,cn=accounts,dc=mpls,dc=local
</Location>


With both ipaserver and ipaserver2 'up', if I connect to 
https://zenoss.mpls.local from ipaclient using firefox, I am successfully 
connected.  If on ipaserver I do a 'ifdown eth0' and attempt another 
connection, it fails.  I have also noticed the following:

1. I am unable to use the ipaserver2 management interface when ipaserver is 
unavailable.
2. It takes a longer period of time to do a kinit

If the I then perform:
[root@ipaserver ~]#ifup eth0

[root@ipaserver2 ~]#ifdown eth0

[mike@ipaclient ~]$kinit
kinit: Cannot contact any KDC for realm 'MPLS.LOCAL' while getting initial 
credentials

[root@ipaserver2 ~]#ifup eth0

[mike@ipaclient ~]$ kinit
Password for mike@MPLS.LOCAL:
[mike@ipaclient ~]$

[root@ipaserver2 ~]#ifdown eth0

.. wait number of minutes

ipaclient screen locks - type password - after a short delay (~7 seconds) 
screen unlock compeletes

[mike@ipaclient ~]$kinit
Password for mike@MPLS.LOCAL:
[mike@ipaclient ~]$

Any ideas?

Thanks,
Mike
This seems to be some DNS problem.
You client does not see the second replica and might have some name
resolution timeouts.

Please check your dns setup and krb5.conf on the client.

To help more we need more details about you client configuration DNS and
kerberos.
Hi,

Additional information...

[root@zenoss ~]#more /etc/resolv.conf
search mpls.local
domain mpls.local
nameserver 172.16.112.5
nameserver 172.16.112.8

[root@zenoss ~]# more /etc/krb5.conf
#File modified by ipa-client-install

[libdefaults]
  default_realm = MPLS.LOCAL
  dns_lookup_realm = true
  dns_lookup_kdc = true
  rdns = false
  ticket_lifetime = 24h
  forwardable = yes

[realms]
  MPLS.LOCAL = {
    pkinit_anchors = FILE:/etc/ipa/ca.crt
  }

[domain_realm]
  .mpls.local = MPLS.LOCAL
  mpls.local = MPLS.LOCAL

[root@ipaclient ~]# more /etc/resolv.conf
# Generated by NetworkManager
search mpls.local
nameserver 172.16.112.5
nameserver 172.16.112.8

[root@ipaclient ~]# more /etc/krb5.conf
#File modified by ipa-client-install

[libdefaults]
  default_realm = MPLS.LOCAL
  dns_lookup_realm = true
  dns_lookup_kdc = true
  rdns = false
  ticket_lifetime = 24h
  forwardable = yes

[realms]
  MPLS.LOCAL = {
    pkinit_anchors = FILE:/etc/ipa/ca.crt
  }

[domain_realm]
  .mpls.local = MPLS.LOCAL
  mpls.local = MPLS.LOCAL

[root@ipaclient ~]# nslookup ipaserver
Server:         172.16.112.5
Address:        172.16.112.5#53

Name:   ipaserver.mpls.local
Address: 172.16.112.5

[root@ipaserver ~]#ifdown eth0

[root@ipaclient ~]# nslookup ipaserver
Server:         172.16.112.8
Address:        172.16.112.8#53

Name:   ipaserver.mpls.local
Address: 172.16.112.5

[root@ipaclient ~]# nslookup ipaserver2
Server:         172.16.112.8
Address:        172.16.112.8#53

Name:   ipaserver2.mpls.local
Address: 172.16.112.8

Copy/paste from the DNS page on ipaserver/ipaserver2

@ NS ipaserver.mpls.local.
     NS ipaserver2.mpls.local.
_kerberos TXT MPLS.LOCAL
_kerberos-master._tcp SRV 0 100 88 ipaserver
                                         SRV 0 100 88 ipaserver2
_kerberos-master._udp SRV 0 100 88 ipaserver
                                           SRV 0 100 88 ipaserver2
_kerberos._tcp SRV 0 100 88 ipaserver
                            SRV 0 100 88 ipaserver2
_kerberos._udp SRV 0 100 88 ipaserver
                             SRV 0 100 88 ipaserver2
_kpasswd._tcp SRV 0 100 464 ipaserver
                            SRV 0 100 464 ipaserver2
_kpasswd._udp SRV 0 100 464 ipaserver
                             SRV 0 100 464 ipaserver2
_ldap._tcp SRV 0 100 389 ipaserver
                    SRV 0 100 389 ipaserver2
_ntp._udp SRV 0 100 123 ipaserver
                   SRV 0 100 123 ipaserver2
ipaclient A 172.16.112.9
ipaclient2 A 172.16.112.145
ipaserver A 172.16.112.5
ipaserver2 A 172.16.112.8
zenoss A 172.16.112.6

Thanks,
Mike

I noticed that there is no domain line in the resolv.conf on the client.
AFAIU in this case it would determine the domain by the gethostname and
in case of network being down it will fail over to the hosts file.
I wonder what is in your /etc/hosts?
Dose it have just a short host name?

[root@ipaclient ~]# more /etc/hosts
127.0.0.1       localhost.localdomain   localhost
::1     localhost6.localdomain6 localhost6


Add domain mpls.local to /etc/resolv.conf

[root@ipaserver ~]#ifdown eth0

[root@ipaclient ~]# kinit mike
kinit: Cannot contact any KDC for realm 'MPLS.LOCAL' while getting initial 
credentials
[root@ipaclient ~]# nslookup ipaserver
Server:         172.16.112.8
Address:        172.16.112.8#53

Name:   ipaserver.mpls.local
Address: 172.16.112.5

[root@ipaclient ~]# nslookup ipaserver2
Server:         172.16.112.8
Address:        172.16.112.8#53

Name:   ipaserver2.mpls.local
Address: 172.16.112.8

add '172.16.112.9 ipaclient.mpls.local ipaclient' to /etc/hosts

[root@ipaserver ~]#ifup eth0

[root@ipaclient ~]# kinit mike
Password for mike@MPLS.LOCAL:

[root@ipaserver ~]#ifdown eth0

[root@ipaclient ~]# kinit mike
kinit: Cannot contact any KDC for realm 'MPLS.LOCAL' while getting initial 
credentials
[root@ipaclient ~]# nslookup -type=srv _kerberos-master._tcp
Server:         172.16.112.8
Address:        172.16.112.8#53

_kerberos-master._tcp.mpls.local        service = 0 100 88 
ipaserver2.mpls.local.
_kerberos-master._tcp.mpls.local        service = 0 100 88 ipaserver.mpls.local.

[root@ipaclient ~]# nslookup -type=srv _kerberos-master._udp
Server:         172.16.112.5
Address:        172.16.112.5#53

_kerberos-master._udp.mpls.local        service = 0 100 88 ipaserver.mpls.local.
_kerberos-master._udp.mpls.local        service = 0 100 88 
ipaserver2.mpls.local.


[root@ipaclient ~]# kinit mike
kinit: Cannot contact any KDC for realm 'MPLS.LOCAL' while getting initial 
credentials

[root@ipaserver ~]#ifup eth0

[root@ipaclient ~]# kinit mike
Password for mike@MPLS.LOCAL:

I'd start with the sssd logs. Is it seeing the main server go offline and not switching to the second one? Or is it going into offline mode?

Do you have _srv_ or both servers listed in ipa_server in /etc/sssd/sssd.conf?

rob

_______________________________________________
Freeipa-users mailing list
Freeipa-users@redhat.com
https://www.redhat.com/mailman/listinfo/freeipa-users

Reply via email to