Open Stack

Nikolay,

Currently every thing that can be turned into a plugin (Ceph, vCenter,
Sahara, Murano, Ceilometer) provides a checkbox (or more complicated
controls) for the settings tab. Why change this approach for plugins? The
settings tab (cluster attributes) currently is a SSOT
<http://en.wikipedia.org/wiki/Single_Source_of_Truth>, and you want to ruin
it for no reason.

Of course it makes no sense to generate anything. Checkboxes on the
settings tab can be added using simple YAML mixin and if you want to check
this checkbox to determine whether to perform some action or not and don't
want to write any python code, try to add to plugin's YAML "restrictions"
section which we already have for the settings tab, the wizard and roles.

2014-10-08 14:50 GMT+07:00 Nikolay Markov <nmarkov at mirantis.com>:

> >>> Right now we already have like 2 types of plugins (extensions),
> classified by usage of settings tab:
> >>> 1. Some kind of backend for service (swift/ceph, lvm/ceph, ovs/nsx),
> or hypervisor (lvm/qemu/vmware)
> >>> 2. Self-contained service that just needs to be installed (sahara,
> murano, zabbix)
>
> That's not quite right. In 6.0 and after that there will be a lot of
> small plugins which only modify some config and/or install some
> package. There is nothing to configure here, and I as a plugin
> developer don't even want to know anything about checkboxes on UI. I
> just want two things: role to execute my command on and command
> itself. That's one small YAML.
>
> And autogenerating checkboxes for such plugins on UI is bad, because
> explicit is better than implicit (and all our settings are explicitly
> defined in openstack.yaml).
>
> On Wed, Oct 8, 2014 at 11:43 AM, Dmitriy Shulyak <dshulyak at mirantis.com>
> wrote:
> > If there is no checkboxes (read configuration) and plugin is installed -
> all
> > deployment tasks will be applied
> > to every environment, but why do you think that there will be no
> checkboxes
> > in most cases?
> >
> > Right now we already have like 2 types of plugins (extensions),
> classified
> > by usage of settings tab:
> > 1. Some kind of backend for service (swift/ceph, lvm/ceph, ovs/nsx), or
> > hypervisor (lvm/qemu/vmware)
> > 2. Self-contained service that just needs to be installed (sahara,
> murano,
> > zabbix)
> >
> > In 1st case you need to provide shared configuration storage (like
> cluster
> > attributes right now), in order for plugin
> > to be able to exclude part of core workflow from running (not installing
> > swift for example).
> > In case if the plugin is self-contained entity, like Sahara, Murano right
> > now - checkboxes would be simply required.
> > It works this way right now, and it doesnot look like huge overhead.
> >
> > So what do you think, will it work or no?
> >
> > On Wed, Oct 8, 2014 at 8:42 AM, Nikolay Markov <nmarkov at mirantis.com>
> wrote:
> >>
> >> Hi,
> >>
> >> Frankly speaking, I'm not sure on how 1st approach will even work.
> >> What if plugin doesn't provide any checkboxes (and in most cases it
> >> won't)? How should we determine in serializer, which plugins should be
> >> applied while generating astute.yaml and tasks.yaml? Should we
> >> autogenerate some stuff for plugins which are not even enabled and do
> >> needless work?
> >>
> >> This looks too complicated for me from the backend side, and option
> >> with enabling/disabling plugins in wizard for specific environment (we
> >> can invent mechanism to disable them on env which is not deployed yet,
> >> besides, for API it's just one PUT) is MUCH simpler and much more
> >> obvious, as I see.
> >>
> >>
> >>
> >> On Wed, Oct 8, 2014 at 8:34 AM, Vitaly Kramskikh
> >> <vkramskikh at mirantis.com> wrote:
> >> > Hi,
> >> >
> >> > I would go with the 1st approach. The thing I don't like in the 2nd
> >> > approach
> >> > is that we have to make the user enable plugin twice. For example, we
> >> > have
> >> > to enable Ceph as a plugin and then add Ceph role to nodes and choose
> >> > what
> >> > we want to store in Ceph (images, objects). Why we would need to
> >> > explicitly
> >> > enable Ceph plugin? Let's always show plugin options in wizard and
> >> > settings
> >> > tab, and if the user just doesn't want to enable Ceph, he would just
> >> > leave
> >> > all the checkboxes unchecked. The 2nd approach would also lead to some
> >> > kind
> >> > of inconsistency in case the user enabled Ceph plugin but left all the
> >> > Ceph-related checkboxes unchecked and didn't add Ceph nodes.
> >> >
> >> > 2014-10-07 21:17 GMT+07:00 Evgeniy L <eli at mirantis.com>:
> >> >>
> >> >> Hi,
> >> >>
> >> >> We had a meeting today about plugins on UI, as result of the meeting
> >> >> we have two approaches and this approaches affect not only UX but
> >> >> plugins itself.
> >> >>
> >> >> 1st - disable/enable plugin on settings tab
> >> >>
> >> >> user installs the plugin
> >> >> creates a cluster
> >> >> configures and enables/disables plugins on settings tab
> >> >>
> >> >> For user it will look like Ceph plugin checkboxes on settings tab,
> >> >> if he enables checkbox, then we pass the parameter to orchestrator
> >> >> as `true`.
> >> >>
> >> >> Cons:
> >> >>
> >> >> plugin developer should define a checkbox in each plugin (for plugin
> >> >> disabling/enabling)
> >> >> on the backend we have to enable all of the plugins for environment,
> >> >> because user can define any name for his checkbox and we won't be
> able
> >> >> to
> >> >> find it and make appropriate mapping plugin <-> env
> >> >> since all of the plugins are always "enabled" we have to run tasks
> for
> >> >> all
> >> >> of the plugins, and each plugin should parse astute.yaml in order to
> >> >> figure
> >> >> out if it's required to run task current script
> >> >>
> >> >> Pros:
> >> >>
> >> >> it won't require additional setting or step for wizard
> >> >> user will be able to disable plugin after environment creation
> >> >>
> >> >> 2nd - enable plugins in wizard
> >> >>
> >> >> user installs the plugin
> >> >> now he can choose specific plugins for his environment in wizard
> >> >> after cluster is created, he can configure additional parameters on
> >> >> settings tab, if plugin provides any
> >> >>
> >> >> Cons:
> >> >>
> >> >> user won't be able to disable plugin after cluster is created
> >> >> additional step or configuration subcategory in wizard
> >> >>
> >> >> Pros:
> >> >>
> >> >> On backend we always know which plugin is disabled and which is
> >> >> enabled.
> >> >>
> >> >> it means we don't provide settings for plugins which are disabled
> >> >> we don't run tasks on slaves if it's not required
> >> >>
> >> >> Thanks,
> >> >>
> >> >> _______________________________________________
> >> >> OpenStack-dev mailing list
> >> >> OpenStack-dev at lists.openstack.org
> >> >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > Vitaly Kramskikh,
> >> > Software Engineer,
> >> > Mirantis, Inc.
> >> >
> >> > _______________________________________________
> >> > OpenStack-dev mailing list
> >> > OpenStack-dev at lists.openstack.org
> >> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >> >
> >>
> >>
> >>
> >> --
> >> Best regards,
> >> Nick Markov
> >>
> >> _______________________________________________
> >> OpenStack-dev mailing list
> >> OpenStack-dev at lists.openstack.org
> >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >
> >
> >
> > _______________________________________________
> > OpenStack-dev mailing list
> > OpenStack-dev at lists.openstack.org
> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >
>
>
>
> --
> Best regards,
> Nick Markov
>
> _______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>



-- 
Vitaly Kramskikh,
Software Engineer,
Mirantis, Inc.
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