[Samba] Correct NTP Settings for Samba 4.0.6?
Andrew Martin
amartin at xes-inc.com
Sat Jul 27 14:15:30 MDT 2013
----- Original Message -----
> From: "Andrew Martin" <amartin at xes-inc.com>
> To: "Thomas Simmons" <twsnnva at gmail.com>
> Cc: samba at lists.samba.org
> Sent: Saturday, July 27, 2013 2:31:21 PM
> Subject: Re: [Samba] Correct NTP Settings for Samba 4.0.6?
>
> ----- Original Message -----
> > From: "Thomas Simmons" <twsnnva at gmail.com>
> > To: "Andrew Martin" <amartin at xes-inc.com>
> > Cc: samba at lists.samba.org
> > Sent: Saturday, July 27, 2013 12:26:57 PM
> > Subject: Re: [Samba] Correct NTP Settings for Samba 4.0.6?
> >
> > Running "w32tm /config /update /syncfromflags:DOMHIER && net stop
> > w32time
> > && net start w32time" should make the client query the directory
> > for
> > it's
> > time server. You can verify the configuration with "w32tm /query
> > /configuration" and look for the "Type" to be NT5DS. This means
> > it's
> > using
> > AD. You can also run w32tm /monitor and the Windows time service
> > will
> > go
> > through the processes of querying the directory to find a time
> > server, then
> > verify it's accessible. If that works, all is working. I found
> > w32tm
> > /monitor will fail if you have your domain functional level at 2008
> > or
> > 2008_R2. I don't know if this is a bug in Samba as I haven't had
> > time
> > to
> > test against a real 2008+ server. Just know it's to be expected.
> >
> >
> > On Sat, Jul 27, 2013 at 12:58 PM, Andrew Martin
> > <amartin at xes-inc.com>
> > wrote:
> >
> > > ----- Original Message -----
> > > > From: "Thomas Simmons" <twsnnva at gmail.com>
> > > > To: "Andrew Martin" <amartin at xes-inc.com>
> > > > Cc: samba at lists.samba.org
> > > > Sent: Saturday, July 27, 2013 11:03:49 AM
> > > > Subject: Re: [Samba] Correct NTP Settings for Samba 4.0.6?
> > > >
> > > >
> > > > The ls -l command you ran shows the ntp_signd directory is
> > > > empty,
> > > > so
> > > > it looks like samba is not creating the socket (at least in
> > > > that
> > > > location). Do you have the "ntp signd socket directory" option
> > > > in
> > > > your smb.conf? If not, try manually it to smb.conf:
> > > >
> > > > ntp signd socket directory = /var/run/samba/ntp_signd
> > > >
> > > >
> > > > Apart from that, my suggestion would be to stop apparmor and
> > > > iptables
> > > > for testing and run ntp and samba with verbose logging on and
> > > > see
> > > > what it says. Also, what does "w32tm /query /source" and "w32tm
> > > > /monitor" show on the client?
> > > >
> > > >
> > > >
> > > > On Sat, Jul 27, 2013 at 11:39 AM, Andrew Martin <
> > > > amartin at xes-inc.com
> > > > > wrote:
> > > >
> > > >
> > > >
> > > > ----- Original Message -----
> > > > > From: "Thomas Simmons" < twsnnva at gmail.com >
> > > > > To: "Andrew Martin" < amartin at xes-inc.com >
> > > > > Cc: samba at lists.samba.org
> > > > > Sent: Saturday, July 27, 2013 10:33:49 AM
> > > > > Subject: Re: [Samba] Correct NTP Settings for Samba 4.0.6?
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > > On Sat, Jul 27, 2013 at 2:26 AM, Andrew Martin <
> > > > > amartin at xes-inc.com
> > > > > > wrote:
> > > > >
> > > > >
> > > > > Hello,
> > > > >
> > > > > I recently compiled Samba 4.0.6 (as an AD DC) and am running
> > > > > it
> > > > > on
> > > > > Ubuntu 12.04.
> > > > > I followed the instructions on the Samba wiki (
> > > > > https://wiki.samba.org/index.php/Configure_NTP )
> > > > > for how to configure ntp, however the domain clients are
> > > > > rejecting
> > > > > the DCs as
> > > > > being acceptable time sources. Below is my ntp.conf:
> > > > >
> > > > > server 127.127.1.0
> > > > > fudge 127.127.1.0 stratum 10
> > > > > server 0.pool.ntp.org iburst prefer
> > > > > server 1.pool.ntp.org iburst prefer
> > > > > driftfile /var/lib/ntp/ntp.drift
> > > > > logfile /var/log/ntp
> > > > > ntpsigndsocket /var/run/samba/ntp_signd
> > > > > restrict default kod nomodify notrap nopeer mssntp
> > > > > restrict 127.0.0.1
> > > > > restrict 0.pool.ntp.org mask 255.255.255.255 nomodify notrap
> > > > > nopeer
> > > > > noquery
> > > > > restrict 1.pool.ntp.org mask 255.255.255.255 nomodify notrap
> > > > > nopeer
> > > > > noquery
> > > > >
> > > > > Using Ubuntu, I am not using SELinux. I do not believe there
> > > > > to
> > > > > be
> > > > > any problems
> > > > > with apparmor, as it contains these lines in
> > > > > /etc/apparmor.d/usr.sbin.ntpd:
> > > > > # samba4 ntp signing socket
> > > > > /{,var/}run/samba/ntp_signd/socket rw,
> > > > >
> > > > > What is the correct procedure for configuring NTP for a
> > > > > Samba4
> > > > > AD
> > > > > DC?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Andrew
> > > > >
> > > > >
> > > > > When you compiled Samba, did you not use the standard install
> > > > > path
> > > > > (/usr/local/samba) or did you add an entry in smb.conf to use
> > > > > /var/run/samba/ntp_signd for the socket?
> > > > >
> > > > Thomas,
> > > >
> > > > When compiling Samba, I specified custom paths to be in line
> > > > with
> > > > Debian's
> > > > conventions for file locations:
> > > > conf_args = \
> > > > --prefix=/usr \
> > > > --enable-fhs \
> > > > --sysconfdir=/etc \
> > > > --localstatedir=/var \
> > > > --with-privatedir=/var/lib/samba/private \
> > > > --with-smbpasswd-file=/etc/samba/smbpasswd \
> > > > --with-piddir=/var/run/samba \
> > > > --with-pammodulesdir=/lib/$(DEB_HOST_MULTIARCH)/security \
> > > > --with-pam \
> > > > --with-syslog \
> > > > --with-utmp \
> > > > --with-pam_smbpass \
> > > > --with-winbind \
> > > >
> > > --with-shared-modules=idmap_rid,idmap_ad,idmap_adex,idmap_hash,idmap_ldap,idmap_tdb2
> > > > \
> > > > --with-automount \
> > > > --with-ldap \
> > > > --with-ads \
> > > > --with-dnsupdate \
> > > > --libdir=/usr/lib/$(DEB_HOST_MULTIARCH) \
> > > > --with-modulesdir=/usr/lib/$(DEB_HOST_MULTIARCH)/samba \
> > > > --datadir=/usr/share \
> > > > --with-lockdir=/var/run/samba \
> > > > --with-statedir=/var/lib/samba \
> > > > --with-cachedir=/var/cache/samba \
> > > > --disable-avahi \
> > > > --with-ctdb=/usr \
> > > > --disable-rpath \
> > > > --disable-ntdb \
> > > > --disable-rpath-install \
> > > > --bundled-libraries=NONE,pytevent,iniparser \
> > > > --builtin-libraries=replace,ccan \
> > > > --minimum-library-version="$(shell ./debian/autodeps.py
> > > > --minimum-library-version)" \
> > > > --without-getpass-replacement \
> > > > --enable-debug
> > > >
> > > >
> > > > Thanks,
> > > >
> > > > Andrew
> > > >
> > > >
> > > Thomas,
> > >
> > > Adding that parameter to the smb.conf file, as well as removing
> > > the
> > > ntp_signd directory
> > > so that samba itself could create it appears to have worked:
> > > root at dc0:/# ls -l /var/run/samba/ntp_signd/
> > > total 0
> > > srwxrwxrwx 1 root root 0 Jul 27 11:41 socket
> > >
> > > I also needed a few extra lines in ntp.conf, otherwise the
> > > Windows
> > > client
> > > would fail
> > > with the error "The computer did not resync beacuse no time data
> > > was
> > > available":
> > > server 0.us.pool.ntp.org
> > > server 1.us.pool.ntp.org
> > > server 2.us.pool.ntp.org
> > > server 3.us.pool.ntp.org
> > > server 127.127.1.0
> > > fudge 127.127.1.0 stratum 10
> > > server 0.pool.ntp.org iburst prefer
> > > server 1.pool.ntp.org iburst prefer
> > > driftfile /var/lib/ntp/ntp.drift
> > > logfile /var/log/ntp
> > > ntpsigndsocket /var/run/samba/ntp_signd
> > > restrict default kod nomodify notrap nopeer mssntp
> > > restrict 127.0.0.1
> > > restrict 0.pool.ntp.org mask 255.255.255.255 nomodify notrap
> > > nopeer
> > > noquery
> > > restrict 1.pool.ntp.org mask 255.255.255.255 nomodify notrap
> > > nopeer
> > > noquery
> > >
> > >
> > > Do the Windows clients prefer ntp information from the DHCP
> > > lease,
> > > or from
> > > the DC that
> > > they are connected to? My DHCP configuration currently is using
> > > an
> > > old NTP
> > > server until
> > > I get Samba4's NTP up and running. Thus, when I run w32tm /query
> > > /source
> > > on the client,
> > > it still shows the old server. I ran the following command to
> > > manually set
> > > it to one of the DCs:
> > > w32tm /config /update /manualpeerlist:dc0 /syncfromflags:MANUAL
> > >
> > > Then, running w32tm /resync succeeds and w32tm /query /source
> > > lists
> > > dc0 as
> > > the NTP source.
> > >
> > > Are there any other tests I should run to verify that NTP is
> > > working
> > > correctly?
> > >
> > > Thanks,
> > >
> > > Andrew
> > >
> >
>
> Thomas,
>
> After following your instructions, I have verified that the type is
> listed
> as NT5DS. Thanks again for your help in getting this working!
>
> Regarding DHCP settings, is it okay to have the DHCP lease push out
> NTP settings (e.g. they'll just get overridden by the DC), or should
> I
> completely remove NTP settings in dhcpd.conf for all domain members?
>
> Thanks,
>
> Andrew
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>
Thomas,
I now notice that w32tm /resync does not work, failing with the error
"The computer did not resync because no time data was available". As I
mentioned in my last message, w32tm /monitor correctly shows all 3 of my
Samba4 DCs (although one of them is currently offline):
dc0.mydomain.com *** PDC ***[192.168.0.101:123]:
ICMP: 0ms delay
NTP: +0.0000000s offset from dc0.x-es.com
RefID: vimo.dorui.net [97.107.128.58]
Stratum: 4
DC1.mydomain.com *** PDC ***[192.168.0.102:123]:
ICMP: 0ms delay
NTP: +0.0049947s offset from dc0.x-es.com
RefID: 'INIT' [0x54494E49]
Stratum: 0
DCT.mydomain.com *** PDC ***[192.168.0.103:123]:
ICMP: error IP_REQ_TIMED_OUT - no response in 1000ms
NTP: ERROR_TIMEOUT - no response from server in 1000ms
Does the w32tm /resync command simply not operate correctly in a domain
environment (even though it returns an error, domain time sync is working)?
Thanks,
Andrew
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