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Ervin Hegedüs

2017-Nov-08 08:24 UTC

[Samba] DC's are unavailable when PDC halted

Hi folks,

there are two Samba4 DC server. The first one is the "PDC", and
after I finished to set up that, I've joined the second one.

There is a Linux client, where I configured the samba, and joined
it to domain as member. Now I see these:

# net ads status -U administrator
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: user
objectClass: computer
cn: OPEN-CLIENT
instanceType: 4
whenCreated: 20171108075440.0Z
...
distinguishedName:
CN=OPEN-CLIENT,CN=Computers,DC=core,DC=mydomain,DC=hu
-------------- Security Descriptor (revision: 1, type: 0x8c17)
owner SID: S-1-5-21-1111351423-2542600865-3078305116-512
group SID: S-1-5-21-1111351423-2542600865-3078305116-512
------- (system) ACL (revision: 4, size: 120, number of ACEs: 2)
------- ACE (type: 0x07, flags: 0x5a, size: 0x38, mask: 0x20, object flags: 0x3)
access SID:  S-1-1-0
...

(a long output...)

# wbinfo --ping-dc
checking the NETLOGON for domain[CORE] dc connection to
"open-ldap2.core.mydomain.hu" succeeded

(note, that the open-ldap2 is the second server).

When I halted the open-ldap (which is the primary DC), all of the
commands above runs timed out.

If I halted the open-ldap2, then wbinfo timed out, but the "net
ads status" shows the message above.


What em I missing? The reason is why I configured two DC's, that
if one of them is kicked, the AD available continously.


Thanks,


a.

Rowland Penny

2017-Nov-08 09:45 UTC

head link

[Samba] DC's are unavailable when PDC halted

On Wed, 8 Nov 2017 09:24:30 +0100
Ervin Hegedüs via samba <samba at lists.samba.org> wrote:
> Hi folks,
> 
> there are two Samba4 DC server. The first one is the "PDC", and
> after I finished to set up that, I've joined the second one.
I am a bit confused here, from reading this post, you seem to have
called the two DCs 'open-ldap' & 'open-ldap2' and you refer
to the
first one as the 'PDC', yet I think you are talking about an AD domain.
Is this the case ?
If so, you have just won the prize for the most confusing post to the
Samba mailing list ;-)

I think you need to post the following files from all three machines:

/etc/hostname
/etc/hosts
/etc/resolv.conf
/etc/krb5.conf
smb.conf

Rowland

Ervin Hegedüs

2017-Nov-08 10:18 UTC

head link

[Samba] DC's are unavailable when PDC halted

Hi Rowland,

On Wed, Nov 08, 2017 at 09:45:48AM +0000, Rowland Penny
wrote:> On Wed, 8 Nov 2017 09:24:30 +0100
> Ervin Hegedüs via samba <samba at lists.samba.org> wrote:
> 
> > Hi folks,
> > 
> > there are two Samba4 DC server. The first one is the "PDC",
and
> > after I finished to set up that, I've joined the second one.
> 
> I am a bit confused here, from reading this post, you seem to have
> called the two DCs 'open-ldap' & 'open-ldap2' and you
refer to the
> first one as the 'PDC', yet I think you are talking about an AD
domain.
the open-ldap and open-ldap2 is just the naming convention...
these were installed, because we've started to build a directory
infrastructure, and started with OpenLDAP. The cluster had worked
as well, but wasn't enough. We had kept the names - nevermind.
> Is this the case ?
Probably :)
I'm not expert in AD, I've used the Samba3 in standalone mode as
DC. The last Windows environment where I used WIN Domain was
about Win2008... I'm really sorry for the confuse...
> If so, you have just won the prize for the most confusing post to the
> Samba mailing list ;-)
oh, I'm pleased to read it! :)
> I think you need to post the following files from all three machines:
> 
> /etc/hostname
> /etc/hosts
> /etc/resolv.conf
> /etc/krb5.conf
> smb.conf
=======open-ldap:

--------
/etc/hostname
open-ldap.core.mydomain.hu

--------
/etc/hosts
127.0.0.1	localhost

#10.10.20.202	open-ldap.core.mydomain.hu
#10.10.20.204	open-ldap2.core.mydomain.hu

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

--------
/etc/resolv.conf
search core.mydomain.hu
nameserver 127.0.0.1
nameserver 10.10.10.1

--------
/etc/krb5.conf
[libdefaults]
	default_realm = CORE.MYDOMAIN.HU
	dns_lookup_realm = false
	dns_lookup_kdc = true

[realms]
	CORE.MYDOMAIN.HU = {
	    kdc = OPEN-LDAP.CORE.MYDOMAIN.HU
	    kdc = OPEN-LDAP2.CORE.MYDOMAIN.HU
	    admin_server = OPEN-LDAP.CORE.MYDOMAIN.HU
	    admin_server = OPEN-LDAP2.CORE.MYDOMAIN.HU
	}


--------
/etc/samba/smb.conf
# Global parameters
[global]
	netbios name = OPEN-LDAP
	realm = CORE.MYDOMAIN.HU
	workgroup = CORE
	dns forwarder = 10.10.10.1
	server role = active directory domain controller
	idmap_ldb:use rfc2307 = yes

	#tls enabled  = yes
	#tls keyfile  = tls/key.pem
	#tls certfile = tls/cert.pem
	#tls cafile   = tls/ca.pem  # if not required, set empty
	log level = 3 passdb:5 auth:5 tdb:5 ldb:5
	#ldap debug level = -1
	ntlm auth = yes
	lanman auth = yes
	client ntlmv2 auth = yes

	# server services = -dns
	server services = rpc, nbt, wrepl, ldap, cldap, kdc, drepl, winbind, ntp_signd,
kcc, dnsupdate, dns, s3fs

[netlogon]
	path = /var/lib/samba/sysvol/core.mydomain.hu/scripts
	read only = No

[sysvol]
	path = /var/lib/samba/sysvol
	read only = No

=======open-ldap2:

--------
/etc/hostname
open-ldap2

--------
/etc/hosts
127.0.0.1	localhost

10.10.20.204	open-ldap2.core.mydomain.hu
10.10.20.202	open-ldap.core.mydomain.hu

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

--------
/etc/resolv.conf
search core.mydomain.hu
nameserver 127.0.0.1
nameserver 10.10.10.1

--------
/etc/krb5.conf
[libdefaults]
	default_realm = CORE.MYDOMAIN.HU
	dns_lookup_realm = false
	dns_lookup_kdc = true

[realms]
	CORE.MYDOMAIN.HU = {
	    kdc = OPEN-LDAP.CORE.MYDOMAIN.HU
	    kdc = OPEN-LDAP2.CORE.MYDOMAIN.HU
	    admin_server = OPEN-LDAP.CORE.MYDOMAIN.HU
	    admin_server = OPEN-LDAP2.CORE.MYDOMAIN.HU
	}


--------
/etc/samba/smb.conf
# Global parameters
[global]
	netbios name = OPEN-LDAP2
	realm = CORE.MYDOMAIN.HU
	workgroup = CORE
	dns forwarder = 10.10.10.1
	server role = active directory domain controller
	idmap_ldb:use rfc2307 = yes
	ntlm auth = yes
	lanman auth = yes
	client ntlmv2 auth = yes
	log level = 3 passdb:5 auth:5 tdb:5 ldb:5

	#server runs = -dns
	server services = rpc, nbt, wrepl, ldap, cldap, kdc, drepl, winbind, ntp_signd,
kcc, dnsupdate, dns, s3fs

[netlogon]
	path = /var/lib/samba/sysvol/core.mydomain.hu/scripts
	read only = No

[sysvol]
	path = /var/lib/samba/sysvol
	read only = No

=======client:

--------
/etc/hostname
open-client

--------
/etc/hosts
127.0.0.1	localhost

10.10.20.205	open-client.core.mydomain.hu	open-client


::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

--------
/etc/resolv.conf
search core.mydomain.hu
nameserver 10.10.20.202
nameserver 10.10.20.204

--------
/etc/krb5.conf
[libdefaults]
	default_realm = CORE.MYDOMAIN.HU

	kdc_timesync = 1
	ccache_type = 4
	forwardable = true
	proxiable = true
	fcc-mit-ticketflags = true
	dns_lookup_realm = false
	dns_lookup_kdc = true

[realms]
	ATHENA.MIT.EDU = {
		kdc = kerberos.mit.edu
		kdc = kerberos-1.mit.edu
		kdc = kerberos-2.mit.edu:88
		admin_server = kerberos.mit.edu
		default_domain = mit.edu
	}
	ZONE.MIT.EDU = {
		kdc = casio.mit.edu
		kdc = seiko.mit.edu
		admin_server = casio.mit.edu
	}
	CSAIL.MIT.EDU = {
		admin_server = kerberos.csail.mit.edu
		default_domain = csail.mit.edu
	}
	IHTFP.ORG = {
		kdc = kerberos.ihtfp.org
		admin_server = kerberos.ihtfp.org
	}
	1TS.ORG = {
		kdc = kerberos.1ts.org
		admin_server = kerberos.1ts.org
	}
	ANDREW.CMU.EDU = {
		admin_server = kerberos.andrew.cmu.edu
		default_domain = andrew.cmu.edu
	}
        CS.CMU.EDU = {
                kdc = kerberos-1.srv.cs.cmu.edu
                kdc = kerberos-2.srv.cs.cmu.edu
                kdc = kerberos-3.srv.cs.cmu.edu
                admin_server = kerberos.cs.cmu.edu
        }
	DEMENTIA.ORG = {
		kdc = kerberos.dementix.org
		kdc = kerberos2.dementix.org
		admin_server = kerberos.dementix.org
	}
	stanford.edu = {
		kdc = krb5auth1.stanford.edu
		kdc = krb5auth2.stanford.edu
		kdc = krb5auth3.stanford.edu
		master_kdc = krb5auth1.stanford.edu
		admin_server = krb5-admin.stanford.edu
		default_domain = stanford.edu
	}
        UTORONTO.CA = {
                kdc = kerberos1.utoronto.ca
                kdc = kerberos2.utoronto.ca
                kdc = kerberos3.utoronto.ca
                admin_server = kerberos1.utoronto.ca
                default_domain = utoronto.ca
	}

[domain_realm]
	.mit.edu = ATHENA.MIT.EDU
	mit.edu = ATHENA.MIT.EDU
	.media.mit.edu = MEDIA-LAB.MIT.EDU
	media.mit.edu = MEDIA-LAB.MIT.EDU
	.csail.mit.edu = CSAIL.MIT.EDU
	csail.mit.edu = CSAIL.MIT.EDU
	.whoi.edu = ATHENA.MIT.EDU
	whoi.edu = ATHENA.MIT.EDU
	.stanford.edu = stanford.edu
	.slac.stanford.edu = SLAC.STANFORD.EDU
        .toronto.edu = UTORONTO.CA
        .utoronto.ca = UTORONTO.CA

--------
/etc/samba/smb.conf

[global]

   workgroup = CORE
   security = ads
   realm = CORE.MYDOMAIN.HU
   idmap config * : backend = tdb
   idmap config * : range = 3000-7999
   username map = /etc/samba/user.map

   dns proxy = no

   log file = /var/log/samba/log.%m
   max log size = 1000

   syslog = 0
   panic action = /usr/share/samba/panic-action %d

   server role = standalone server
   passdb backend = tdbsam
   obey pam restrictions = yes
   unix password sync = yes

   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:*
%n\n *password\supdated\ssuccessfully* .

   pam password change = yes
   map to guest = bad user

   usershare allow guests = yes

[homes]
   comment = Home Directories
   browseable = no

   read only = yes

   create mask = 0700

   directory mask = 0700

   valid users = %S

[printers]
   comment = All Printers
   browseable = no
   path = /var/spool/samba
   printable = yes
   guest ok = no
   read only = yes
   create mask = 0700

[print$]
   comment = Printer Drivers
   path = /var/lib/samba/printers
   browseable = yes
   read only = yes
   guest ok = no



Sorry again for the confusing post.



a.

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