[ovirt-devel] ovirt-provider-ovn - appliance inclusion / default enablement

Thu May 18 15:22:04 UTC 2017

On Thu, May 18, 2017 at 4:47 PM, Marcin Mirecki <mmirecki at redhat.com> wrote:

> The size of the required components:
>
> Name   : openvswitch                      Size    : 11 M
> Name   : openvswitch-ovn-common  Size    : 2.8 M
> Name   : openvswitch-ovn-host        Size    : 1.9 M
> Name   : ovirt-provider-ovn              Size    : 224 k
> Name   : python-openvswitch          Size    : 821 k
>
> about 17M total
>

Latest nightly built appliance from master [1]  is 751MB so we are talking
about a 2% increment.
If OVN if something that could interest a great part of our users, and
personally I absolutely think so, I'd suggest to simply include it.

[1]
http://resources.ovirt.org/pub/ovirt-master-snapshot/rpm/el7/noarch/ovirt-engine-appliance-4.2-20170517.1.el7.centos.noarch.rpm

>
> On Thu, May 18, 2017 at 3:26 PM, Simone Tiraboschi <stirabos at redhat.com>
> wrote:
>
>>
>>
>> On Wed, May 17, 2017 at 2:35 PM, Yedidyah Bar David <didi at redhat.com>
>> wrote:
>>
>>> On Wed, May 17, 2017 at 2:54 PM, Dan Kenigsberg <danken at redhat.com>
>>> wrote:
>>> > On Wed, May 17, 2017 at 12:23 PM, Yedidyah Bar David <didi at redhat.com>
>>> wrote:
>>> >> On Wed, May 17, 2017 at 11:42 AM, Dan Kenigsberg <danken at redhat.com>
>>> wrote:
>>> >>> On Wed, May 17, 2017 at 10:44 AM, Yedidyah Bar David <
>>> didi at redhat.com> wrote:
>>> >>>> On Wed, May 17, 2017 at 9:38 AM, Dan Kenigsberg <danken at redhat.com>
>>> wrote:
>>> >>>>> On Tue, May 16, 2017 at 6:56 PM, Sandro Bonazzola <
>>> sbonazzo at redhat.com> wrote:
>>> >>>>>>
>>> >>>>>> Hi,
>>> >>>>>> with https://gerrit.ovirt.org/76855 it's requested to increase
>>> the appliance size by adding ovirt-provider-ovn and its dependencies.
>>> >>>>>>
>>> >>>>>> This raise a few questions.
>>> >>>>>> The support for ovirt-provider-ovn is enabled by default in
>>> engine-setup and going to be installed by default in the appliance so we're
>>> pushing to use it.
>>> >>>>>> Why not requiring it at ovirt-engine spec file level?
>>> >>>>>> Answer given in the commit message of above patch is:
>>> >>>>>>
>>> >>>>>> We do not want to have a hard dependency in the
>>> >>>>>> form of an rpm require.
>>> >>>>>> OVN and openvswitch are relatively heavy and complex,
>>> >>>>>> and are still experimental. We would not want to
>>> >>>>>> force everybody to pull them onto any Engine host.
>>> >>>>>>
>>> >>>>>> So why adding it to the appliance, which is the default for
>>> hosted engine which is our recommeded way to deploy oVirt, and enable it by
>>> default?
>>> >>>>>>
>>> >>>>>> How this differs from DWH? ovirt-engine requires
>>> ovirt-engine-setup which requires ovirt-engine-dwh setup which requires
>>> ovirt-engine-dwh.
>>> >>>>>> Why can't we just require ovirt-provider-ovn in ovirt-engine
>>> instead of tweaking the appliance?
>>> >>>>>>
>>> >>>>>> If we decide it's not mandatory, why not make the default to not
>>> enabling it in engine-setup and avoid to add it to the appliance?
>>> >>>>>> Being optional, adding it collides with Bug 1401931 - [RFE]
>>> reduce the size of the appliance
>>> >>>>>
>>> >>>>> Much like with DWH, I can envisage a use case where
>>> ovirt-provider-ovn
>>> >>>>> sits on a remote host, rather than on Engine's. However, the
>>> default
>>> >>>>> use case is to place them on the same host.
>>> >>>>>
>>> >>>>> I thought that it would be a good idea to include OVN on the
>>> >>>>> appliance, as a means to showcase this new and exciting feature of
>>> >>>>> oVirt. However, it is not a must. We can say that we'd like to keep
>>> >>>>> the appliance small; if someone wants to use OVN with it, let them
>>> run
>>> >>>>> ovirt-engine-setup manually, and pull in the dependencies.
>>> >>>>
>>> >>>> The appliance is assumed to (soon?) be our standard installation
>>> flow,
>>> >>>> not a way to showcase things. For the latter, you might want to add
>>> ovn
>>> >>>> to ovirt-live or to the ovirt demo tool [1] (not yet released IIUC).
>>> >>>>
>>> >>>> [1] https://trello.com/b/wocfflzf/sales-demo-tool-lago-based
>>> >>>>
>>> >>>>>
>>> >>>>> For this we'd need to flip the default, and not install OVN when
>>> the
>>> >>>>> appliance is created, and skip OVN test in the offline test suite.
>>> >>>>
>>> >>>> +1
>>> >>>
>>> >>> Could you point us to the answer file used for appliance creation?
>>> >>
>>> >> Do you want to keep the default True for non-appliance? My +1 above
>>> >> was also for reverting the default, not only in appliance.
>>> >
>>> > Oh. I still want to have OVN by default for non-appliance. I like this
>>> > feature, and I want to entice people to use it.
>>>
>>> I think that Sandro's question above applies equally well to the
>>> non-appliance usecase. If it's good enough to be the default for
>>> non-appliance, might as well be so for the appliance as well. If
>>> it's not good enough for the appliance, perhaps default to No also
>>> for non-appliance.
>>>
>>> >
>>> > For appliance I understand that we have a size limitation, so ok, let
>>> > us not bloat it up.
>>>
>>> What's the impact on size? For the appliance image and for the
>>> eventually-installed machine?
>>>
>>> I do not think the impact on appliance size is the major question here,
>>> but whether we really expect most users to use OVN. But I might be
>>> surprised...
>>>
>>>
>> Now we have a bug to track it:
>> https://bugzilla.redhat.com/show_bug.cgi?id=1452131
>>
>>
>>> >
>>> > I hope you are also fine with disabling ovn in the following answer
>>> file.
>>> >
>>> >>
>>> >> The appliance-supplied answer file seems is:
>>> >>
>>> >> https://gerrit.ovirt.org/gitweb?p=ovirt-appliance.git;a=blob
>>> ;f=engine-appliance/data/ovirt-engine-answers;h=2881af656329
>>> 7a7a3d220dfe479d39f88c12ca46;hb=HEAD
>>> >>
>>> >> When hosted-engine --deploy is using the appliance, and if the user
>>> >> asks to run engine-setup automatically, it uses above file,
>>> >> but also adds another file, auto-generated, see here:
>>> >>
>>> >> https://gerrit.ovirt.org/gitweb?p=ovirt-hosted-engine-setup.
>>> git;a=blob;f=src/plugins/gr-he-common/vm/cloud_init.py;h=0a2
>>> 0f946d65199423c99769ab51e4fe092465e96;hb=HEAD#l1018
>>> >>
>>> >> None of them has the answer for OVN. Latter has:
>>> >>
>>> >> DIALOG/autoAcceptDefault=bool:True
>>> >>
>>> >> For this, see:
>>> >>
>>> >> https://bugzilla.redhat.com/show_bug.cgi?id=1270719
>>>
>>>
>>>
>>> --
>>> Didi
>>> _______________________________________________
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>>> Devel at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/devel
>>>
>>
>>
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>
>
>
> --
>
> MARCIN mIRECKI
>
> Red Hat
>
> <https://www.redhat.com>
> <https://red.ht/sig>
>
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