[ovirt-users] Duplicate host_id after deployment via GUI, how is the hosted engine host_id selected?
Thomas Klute
klute at ingenit.com
Tue Apr 24 09:12:33 UTC 2018
Dear Martin,
yes, that's a good improvement!
Just to let you know: The alignment of database and host ids did work
and thus we now have everything aligned and will have an improved output
because of your changes, thanks!
Best regards,
Thomas
> Hi Thomas,
>
> I posted https://gerrit.ovirt.org/#/c/90549/ in an attempt to see how
> to improve the clarity. The result is in the attachment.
>
> The ID is still different, but the section header shows the hostname
> as well. Do you think it would be enough for you? We can't expect
> people to touch the DB every time they add a host out of order and the
> SPM ID is not selectable by user, because it needs to fit some storage
> constraints (we use it for protecting storage metadata) and must match
> the hosted engine ID now.
>
> Best regards
>
> Martin Sivak
>
> On Mon, Apr 23, 2018 at 2:47 PM, Thomas Klute <klute at ingenit.com> wrote:
>> Hi Martin,
>>
>> I fully understand.
>> The only reason is that it's not only me administering this oVirt setup,
>> it's a setup for a client that has 2 local administrators.
>> We are trying to eliminate any configuration that might cause confusion.
>> When doing a
>>
>> hosted-engine --vm-status
>>
>> a list like this is shown:
>>
>> --== Host 1 status ==--
>> ...
>> Hostname : ovirt1.munk.de
>> Host ID : 1
>> ...
>>
>> --== Host 2 status ==--
>> ...
>> Hostname : ovirt3.munk.de
>> Host ID : 2
>> ...
>>
>> and so on.
>> This "Host 2" -> ovirt3 will sooner or later cause confusion and will
>> lead to administrative actions applied to the wrong hosts.
>>
>> I'll give it a try and try to align the hosts and ids. I'll backup the
>> old values in order to be able to roll back the changes if it does not work.
>>
>> Thanks for your help!!
>> Best regards,
>> Thomas
>>
>>
>>
>>> Hi Thomas,
>>>
>>> is there a real need to have them aligned? Both SPM ID and Hosted
>>> engine ids are quite hidden and accompanied by hostname where visible.
>>>
>>> I understand the urge to have everything neatly organized, but playing
>>> with hosted engine IDs and SPM IDs will bring you nothing but trouble.
>>>
>>> Theoretically you could put all hosts to maintenance, hosted engine to
>>> global maintenance, stop the engine service and update the DB and
>>> hosted engine config files. Changing anything when active is a big
>>> NO-NO. And I can't promise stability even if you stop everything
>>> first.
>>>
>>> The short version: Please change hosted engine ID to match SPM ID
>>> (/etc/ovirt-hosted-engine/hosted-engine.conf) and ignore the hostname
>>> vs ID mismatch. All other options might cost you..
>>>
>>> Best regards
>>>
>>> --
>>> Martin Sivak
>>> SLA / oVirt
>>>
>>> On Mon, Apr 23, 2018 at 2:26 PM, Thomas Klute <klute at ingenit.com> wrote:
>>>> Dear Simone,
>>>>
>>>> thanks for the help, I already have noticed, that there is a mismatch
>>>> between SPM IDs and the hosts.
>>>> From my knowledge this may be our fault.
>>>>
>>>> vds_name | vds_spm_id
>>>> oVirt4 | 3
>>>> oVirt2 | 4
>>>> oVirt6 | 6
>>>> oVirt5 | 5
>>>> oVirt1 | 1
>>>> oVirt3 | 2
>>>>
>>>> oVirt3 was re-installed using the node ng image - and was assigned id 2 that
>>>> was available at that time (taken into account this database query).
>>>> It was not available in fact because of the host ovirt2 having the host_id=2
>>>> entry in the configuration on the host and the sanlock having locked the
>>>> appropriate space.
>>>>
>>>> I can't remember where this mismatch came from but I assume that some time
>>>> ago someone maybe manually changed the entry on oVirt2 host in order to
>>>> match with the hostname (oVirtX -> Host id X).
>>>> Thus I think it is not a bug at the moment.
>>>>
>>>> But that leads me to the next question:
>>>>
>>>> Is there a manual way to align numbers in the hostnames with the SPM IDs?
>>>> (oVirt4 should be spm id 4)
>>>>
>>>> Does this work? Update the database, change the entry in hosted-engine.conf
>>>> and then reboot the node?
>>>>
>>>> Thanks & best regards,
>>>> Thomas
>>>>
>>>>
>>>>
>>>>
>>>> On Mon, Apr 23, 2018 at 1:04 PM, Martin Sivak <msivak at redhat.com> wrote:
>>>>> Hello,
>>>>>
>>>>> the ID should be coming from the SPM ID of the host as assigned by the
>>>>> engine and duplicates should not be happening indeed.
>>>>>
>>>>> Can you please tell us what version of engine you have and how was
>>>>> first hosted engine node deployed? We recently changed the default
>>>>> deployment method (4.2.2 in fact) and we would like to know whether
>>>>> this might be related to that change or not.
>>>>>
>>>>> Simone, do you know how to debug this? Are there logs we could use to
>>>>> check the behavior? The host-deploy logs maybe?
>>>> Thomas,
>>>> can you please share the output of
>>>> sudo -u postgres scl enable rh-postgresql95 -- psql -d engine -c "select
>>>> vds_id, vds_name, vds_spm_id from vds"
>>>> executed on the engine VM
>>>>
>>>> and the content of /var/log/ovirt-engine/host-deploy (still from the engine
>>>> VM)?
>>>>
>>>>> Best regards
>>>>>
>>>>> --
>>>>> Martin Sivak
>>>>> SLA / oVirt
>>>>>
>>>>> On Mon, Apr 23, 2018 at 12:54 PM, Thomas Klute <klute at ingenit.com> wrote:
>>>>>> Dear oVirt Users,
>>>>>>
>>>>>> we installed a third ovirt node using the ovirt node ng image (4.2.2),
>>>>>> and
>>>>>> added that node using the web interface of the hosted engine:
>>>>>>
>>>>>> Compute->Hosts->New - including the Hosted engine option "Choose hosted
>>>>>> engine deployment action" set to "Deploy"
>>>>>>
>>>>>> After that we found out, that on the new node the host_id entry was
>>>>>> causing
>>>>>> problems. In
>>>>>>
>>>>>> /etc/ovirt-hosted-engine/hosted-engine.conf
>>>>>>
>>>>>> we found the entry
>>>>>>
>>>>>> ...
>>>>>> host_id=2
>>>>>> ...
>>>>>>
>>>>>> But that host id already exists and was alive during deployment process.
>>>>>> So my questions are:
>>>>>>
>>>>>> How is the host id chosen (when adding a new host via GUI)?
>>>>>> Is there an option to preselect the host id in the GUI for a new node?
>>>>>> How can we prevent further duplicate host ids?
>>>>>>
>>>>>> Thanks and best regards,
>>>>>> Thomas
>>>>>>
>>>>>>
>>>>>> --
>>>>>> ________________________________________________________________________
>>>>>>
>>>>>> Dipl.-Inform. Thomas Klute klute at ingenit.com
>>>>>> Geschäftsführer / CEO
>>>>>> ----------------------------------------------------------------------
>>>>>> ingenit GmbH & Co. KG Tel. +49 (0)231 58 698-120
>>>>>> Emil-Figge-Strasse 76-80 Fax. +49 (0)231 58 698-121
>>>>>> D-44227 Dortmund www.ingenit.com
>>>>>>
>>>>>> Registergericht: Amtsgericht Dortmund, HRA 13 914
>>>>>> Gesellschafter : Thomas Klute, Marc-Christian Schröer
>>>>>> ________________________________________________________________________
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Users mailing list
>>>>>> Users at ovirt.org
>>>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>>>
>>>>
>>>> Sollten noch Fragen offen sein, stehen wir Ihnen natürlich jederzeit
>>>> gerne zur Verfügung.
>>>>
>>>> Mit Grüßen aus Dortmund,
>>>> Thomas Klute
>>>>
>>>> --
>>>> ________________________________________________________________________
>>>>
>>>> Dipl.-Inform. Thomas Klute klute at ingenit.com
>>>> Geschäftsführer / CEO
>>>> ----------------------------------------------------------------------
>>>> ingenit GmbH & Co. KG Tel. +49 (0)231 58 698-120
>>>> Emil-Figge-Strasse 76-80 Fax. +49 (0)231 58 698-121
>>>> D-44227 Dortmund www.ingenit.com
>>>>
>>>> Registergericht: Amtsgericht Dortmund, HRA 13 914
>>>> Gesellschafter : Thomas Klute, Marc-Christian Schröer
>>>> ________________________________________________________________________
>> Sollten noch Fragen offen sein, stehen wir Ihnen natürlich jederzeit
>> gerne zur Verfügung.
>>
>> Mit Grüßen aus Dortmund,
>> Thomas Klute
>>
>> --
>> ________________________________________________________________________
>>
>> Dipl.-Inform. Thomas Klute klute at ingenit.com
>> Geschäftsführer / CEO
>> ----------------------------------------------------------------------
>> ingenit GmbH & Co. KG Tel. +49 (0)231 58 698-120
>> Emil-Figge-Strasse 76-80 Fax. +49 (0)231 58 698-121
>> D-44227 Dortmund www.ingenit.com
>>
>> Registergericht: Amtsgericht Dortmund, HRA 13 914
>> Gesellschafter : Thomas Klute, Marc-Christian Schröer
>> ________________________________________________________________________
>>
Sollten noch Fragen offen sein, stehen wir Ihnen natürlich jederzeit
gerne zur Verfügung.
Mit Grüßen aus Dortmund,
Thomas Klute
--
________________________________________________________________________
Dipl.-Inform. Thomas Klute klute at ingenit.com
Geschäftsführer / CEO
----------------------------------------------------------------------
ingenit GmbH & Co. KG Tel. +49 (0)231 58 698-120
Emil-Figge-Strasse 76-80 Fax. +49 (0)231 58 698-121
D-44227 Dortmund www.ingenit.com
Registergericht: Amtsgericht Dortmund, HRA 13 914
Gesellschafter : Thomas Klute, Marc-Christian Schröer
________________________________________________________________________
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