[ovirt-users] How does VDSM-Fake actually work?

Thu Feb 18 10:34:39 UTC 2016

On Wed, Feb 17, 2016 at 7:28 PM, Nicolás <nicolas at devels.es> wrote:

> Hi Roman,
>
> El 16/02/16 a las 10:27, Roman Mohr escribió:
>
> On Fri, Feb 12, 2016 at 12:45 PM, Michal Skrivanek <
> michal.skrivanek at redhat.com> wrote:
>
>>
>> On 09 Feb 2016, at 12:15, Nicolás < <nicolas at devels.es>nicolas at devels.es>
>> wrote:
>>
>> Is there a way to get an account on mojo.redhat.com or is it internal?
>> I'm trying to open the document but credentials are required and I see no
>> option to create an account.
>>
>>
>> yes it is
>>
>> Eldad, would you please move it to ovirt.org instead?
>>
>>
> I recently played with fakevdsm myself. The result was the patch series in
> [1]. At least an updated README for the result of my patches can be found
> in [2].
>
>
>> Thanks,
>> michal
>>
>>
>> El 04/02/16 a las 13:49, emarcian escribió:
>>
>> Hi,
>> Seems like you need to change this settings update vdc_options set
>> option_value='false' where option_name='InstallVds';
>> follow the instructions here:
>> <https://mojo.redhat.com/docs/DOC-990399>
>> https://mojo.redhat.com/docs/DOC-990399
>>
>> in case you using 3.6 there is a new war (if you run the simulator as
>> standalone).
>>
>> -Eldad
>>
>>
>> On 02/04/2016 03:04 PM, Piotr Kliczewski wrote:
>>
>> Eldad is working on making it working with engine 3.6. He should be able to
>> give you information you need.
>>
>> On Wed, Feb 3, 2016 at 12:33 PM,  <nicolas at devels.es> <nicolas at devels.es> wrote:
>>
>> Anything?
>>
>> El 2016-02-02 10:18, Nicolás escribió:
>>
>> Hi,
>>
>>  I'm trying to set up VDSM-Fake
>> (git://gerrit.ovirt.org/ovirt-vdsmfake.git) for some tests, however,
>> I'm a bit confused about how does it actually work. As the
>> instructions say, I was able to build the project with Maven (however,
>> the org.ovirt.vdsm-jsonrpc-java dependency version had to be changed
>> to 1.1.5 instead of 1.1.2-SNAPSHOT in pom.xml as this latter is no
>> longer provided at the repository).
>>
>>  Once built, I run mvn jetty:run and the server started correctly:
>>
>>
>> 2016-02-02 11:01:51.957:INFO::jetty-6.1.26 [1]
>> 2016-02-02 11:01:52.804:INFO::No [2] Transaction manager found - if
>> your webapp requires one, please configure one.
>> 2016-02-02 11:01:53,424 Application initialized.
>> 2016-02-02 11:01:53,442 Opening a Stomp server localhost:54322
>> 2016-02-02 11:01:53.702:INFO::Started [3]SelectChannelConnector at 0.0.0.0:54321
>> [INFO] Started Jetty Server
>> [INFO] Starting scanner at interval of 10 seconds.
>>
>>  I could indeed verify it's listening on the VDSM port:
>>
>>
>> [root at host ovirt-vdsmfake]# netstat -atpn | grep 54321
>> tcp6       0      0
>> :::54321
>> :::*                    LISTEN
>> 44870/java
>>
>>  So the next step is to add a fake host via REST. I used scripts
>> provided here [4] and I successfully added the host, however, it
>> starts installing all the VDSM packages as it were a normal host and
>> therefore it tries to start vdsmd as well, which throws an error as
>> the Jetty Server is already listening on the 54321 port. I shut down
>> the Jetty Server and allowed oVirt Manager to install all the packages
>> properly, then stopped vdsmd and started the Jetty Server, but
>> expectedly oVirt Engine fails with message "Host xxx is non
>> responsive", so what I actually got is a real VDSM host and not a fake
>> one.
>>
>>  FWIW, the fake VDSM runs on a different host, ports are reacheable
>> from the oVirt engine, proper /etc/hosts has been added to the engine
>> to reach the host, and no further customization of web.xml has been
>> done.
>>
>>  I feel like I'm missing something here. Could someone shed some light
>> on what's wrong?
>>
>>  Thanks.
>>
>>  Nicolás
>>
>>
> @Nicolas I would recommend you to use the top of my gerrit patches to run
> vdsmake:
>
>   git clone git://gerrit.ovirt.org/ovirt-vdsmfake
>   cd ovirt-vdsmfake
>   git fetch git://gerrit.ovirt.org/ovirt-vdsmfake refs/changes/70/53570/2
> && git checkout FETCH_HEAD
>
> then follow the instructions in the README of the checked out repository
> [3].
>
> Hope that helps.
>
> Best Regards,
> Roman
>
>>
>> [1]
> https://gerrit.ovirt.org/#/q/status:open+project:ovirt-vdsmfake+branch:master+topic:easy_access
> [2] https://gerrit.ovirt.org/#/c/53570/
> [3] https://gerrit.ovirt.org/#/c/53570/2/README
>
>
> I could finally make fakevdsm work with your changes. Maybe I'm missing
> something but this works if the engine and the fake host are run on the
> same server - when I tried to run the fake host on a different host I
> wasn't seeing any responses from the host (the firewall was vanilla clean).
> In any case, I'm ok with both running on the same machine.
>

An obvious error might be that you wrote 127.0.0.1 to /etc/hosts on the
ovirt-engine host instead of the remote host. For everything else the more
detailed answer from @emarcian might help you.

>
> Will this be merged into master?
>

It is already. :)

You can check it out from github [4] or gerrit [5].

>
> Thanks.
>

[4] https://github.com/oVirt/ovirt-vdsmfake/
[5] git://gerrit.ovirt.org/ovirt-vdsmfake
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