[Samba] replication issues solved by adding GUID names to /etc/hosts
mourik jan heupink - merit
heupink at merit.unu.edu
Wed Aug 27 02:38:34 MDT 2014
Hi Louis,
I tested name resolution using "host GUID._msdcs..." with all the
correct answers on all dc's, only ping failed.
I now notice a small (but vital?) difference between /etc/hosts on the
two DC's, and also in /etc/resolv.conf
root at dc4:~# cat /etc/hosts
127.0.0.1 localhost
192.87.x.y dc4.company.com dc4
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
root at dc4:~# cat /etc/resolv.conf
search company.com
nameserver 192.87.x.y5 (=dc2)
nameserver 192.87.x.y4 (=dc4)
nameserver 192.87.x.1 (=caching external dns)
root at DC2:~# cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 DC2.company.com DC2
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
root at DC2:~# cat /etc/resolv.conf
nameserver 192.87.x.y4 (=dc4)
nameserver 192.87.x.y5 (=dc2)
nameserver 192.87.x.1 (=caching external dns)
root at DC2:~#
(obviously these are /etc/hosts before I added the GUID._msdcs...)
Could these small differences (127.0.1.1 vs 192.87.x.y) and (search
company.com vs no search) be responsible for the observed behaviour?
MJ
On 8/27/2014 10:15, L.P.H. van Belle wrote:
> Ok.. wel and your sure the resolv.conf is correct?
> cat you post the hosts file and resolv.conf file. just to be sure.
>
> i noticed, ( sernet samba) that after adding a DC, the replication didnt work right a way.
> It needed a restart of the server. This was tested with server samba 4.1.4-4.1.9
> and after the restart replication started working.
>
> Greetz,
>
> Louis
>
>
>> -----Oorspronkelijk bericht-----
>> Van: heupink at merit.unu.edu
>> [mailto:samba-bounces at lists.samba.org] Namens mourik jan
>> heupink - merit
>> Verzonden: woensdag 27 augustus 2014 10:08
>> Aan: samba at lists.samba.org
>> Onderwerp: Re: [Samba] replication issues solved by adding
>> GUID names to /etc/hosts
>>
>> Hi,
>>
>> Yes, what I'm saying is not that without the guid's in /etc/hosts
>> replication will give errors. (we have had successful replication here
>> as well)
>>
>> What I'm saying is, that there were some remaining WERR_BADFILE repl
>> errors after adding a new dc. After waiting hours, restarting samba
>> several times these did not go away.
>>
>> Then I read the post I mentioned, and added the GUID's to /etc/hosts,
>> and immediately my WERR_BADFILE errors disappeared.
>>
>> I no expert, and again: we've always had successful
>> replication here as
>> well, without the entries in /etc/hosts. But these errors
>> remained, and
>> disappeared immediately after editing /etc/hosts.
>>
>> Plus there have been some more similar reports on this list, I'd say:
>> where there is smoke, there is a fire.
>>
>> Some 'evidence' from the list archives, three different
>> threads over the
>> last year, similar problem, all sharing the same solution:
>>
>> http://marc.info/?l=samba&m=137032630404682&w=2
>> http://marc.info/?l=samba&m=137003992508143&w=2
>> http://marc.info/?l=samba&m=137000020326397&w=2
>>
>> Again: not saying that it will never work without the entries in
>> /etc/hosts, but...
>>
>> Kind regards,
>> Mourik Jan
>>
>> On 8/27/2014 8:22, L.P.H. van Belle wrote:
>>> Hai Mourik Jan,
>>>
>>>
>>> host bd6bdc30-c9b2-4fd4-9bdc-4230fec98d59._msdcs.internal.domain.tld
>>>
>> bd6bdc30-c9b2-4fd4-9bdc-4230fec98d59._msdcs.internal.domain.tld
>> is an alias for rtd-dc1.internal.domain.tld.
>>> rtd-dc1.internal.domain.tld has address 192.168.0.1
>>> root at rtd-dc1:~# ping
>> bd6bdc30-c9b2-4fd4-9bdc-4230fec98d59._msdcs.internal.domain.tld
>>> ping: unknown host
>> bd6bdc30-c9b2-4fd4-9bdc-4230fec98d59._msdcs.internal.domain.tld
>>>
>>> and samba-tool drs showrepl shows 0 errors.
>>>
>>> Greetz,
>>>
>>> Louis
>>>
>>>
>>>> -----Oorspronkelijk bericht-----
>>>> Van: heupink at merit.unu.edu
>>>> [mailto:samba-bounces at lists.samba.org] Namens mourik jan
>>>> heupink - merit
>>>> Verzonden: dinsdag 26 augustus 2014 22:59
>>>> Aan: Chan Min Wai; Marc Muehlfeld
>>>> CC: samba at lists.samba.org
>>>> Onderwerp: Re: [Samba] replication issues solved by adding
>>>> GUID names to /etc/hosts
>>>>
>>>> Well, I can only tell you what I observed.
>>>>
>>>> Does ping to the GUID name of your DC's work on your
>> install? And for
>>>> others here? I am on regular fresh installed wheezy x64.
>>>>
>>>> MJ
>>>>
>>>> On 08/26/2014 09:06 PM, Chan Min Wai wrote:
>>>>> Dear Mourik Jan,
>>>>>
>>>>> I would have to say that something was not right on your
>>>> system library.
>>>>> I'm sorry that I cannot tell you which one.
>>>>>
>>>>> I was having this issue on my gentoo and recently found the
>>>> problem was
>>>>> with my LDflags..
>>>>> I've to comment the one I normally use and leave it as default..
>>>>>
>>>>> Where other are basically unchanged...
>>>>>
>>>>> And now my DC can replicate between each other without the
>> /etc/hosts
>>>>> modification.
>>>>>
>>>>> Hope this help....
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Aug 27, 2014 at 2:36 AM, Marc Muehlfeld
>> <mmuehlfeld at samba.org
>>>>> <mailto:mmuehlfeld at samba.org>> wrote:
>>>>>
>>>>> Hello Mourik Jan,
>>>>>
>>>>>
>>>>> Am 26.08.2014 20:24, schrieb mourik jan heupink - merit:
>>>>> > We were having replication issues on wheezy with
>>>> sernet-samba-4.1.11.
>>>>> >
>>>>> > Searching the list I found the following post:
>>>>> > http://marc.info/?l=samba&m=136999742625184&w=2
>>>>> >
>>>>> > It says basically that if you are unable to *ping*
>>>> the GUID names for
>>>>> > your dc's, you might be experiencing a glibc
>> error, where dns
>>>>> names with
>>>>> > an underscore are not properly resolved.
>>>>> >
>>>>> > Note: dns is basically correct, 'host' gives all the
>>>> correct answers,
>>>>> > samba_dnsupdate on all dc's says: no dns updates
>> are needed.
>>>>> >
>>>>> > The fix in the post, is to add GUID names to
>>>> /etc/hosts which I
>>>>> did on
>>>>> > my dc's, and then all of a sudden ping started
>> working like it
>>>>> should.
>>>>> > But ALSO replication! Our 'WERR_BADFILE' errors
>> are gone now.
>>>>> >
>>>>> > Now, is this not something that should be much more
>>>> prominent in
>>>>> the docs?
>>>>>
>>>>> Thanks for providing this information. I'll try finding
>>>> out more about
>>>>> that and add it to the documentation.
>>>>>
>>>>>
>>>>> Regards,
>>>>> Marc
>>>>> --
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>>>>> instructions: https://lists.samba.org/mailman/options/samba
>>>>>
>>>>>
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>>>>
>>>
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>>
>
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