Open Stack

Sounds good. I wanna join .
I haven't tried cephadm yet but It would help us to make ceph new features
more transparent to Cinder in the future.
Thanks



On Thu, Jan 20, 2022 at 4:45 AM Francesco Pantano <fpantano at redhat.com>
wrote:

> Hi Victoria,
> thanks for starting this thread.
>
> On Wed, Jan 19, 2022 at 2:03 PM Sean Mooney <smooney at redhat.com> wrote:
>
>> On Wed, 2022-01-19 at 12:04 +0100, Victoria Martínez de la Cruz wrote:
>> > Hi all,
>> >
>> > I'm reaching out to you to let you know that we will start the design
>> and
>> > development of a Cephadm DevStack plugin.
>> >
>> > Some of the reasons on why we want to take this approach:
>> >
>> > - devstack-plugin-ceph worked for us for a lot of years, but the
>> > development of it relies on several hacks to adapt to the different Ceph
>> > versions we use and the different distros we support. This led to a
>> > monolithic script that sometimes is hard to debug and break our
>> development
>> > environments and our CI
>> > - cephadm is the deployment tool developed and maintained by the Ceph
>> > community, it allows their users to get specific Ceph versions very
>> easily
>> > and enforces good practices for Ceph clusters. From their docs, "Cephadm
>> > manages the full lifecycle of a Ceph cluster. It starts by
>> bootstrapping a
>> > tiny Ceph cluster on a single node (one monitor and one manager) and
>> then
>> > uses the orchestration interface (“day 2” commands) to expand the
>> cluster
>> > to include all hosts and to provision all Ceph daemons and services.
>> [0]"
>> > - OpenStack deployment tools are starting to use cephadm as their way to
>> > deploy Ceph, so it would be nice to include cephadm in our development
>> > process to be closer with what is being done in the field
>> >
>> > I started the development of this in [1], but it might be better to
>> change
>> > devstack-plugin-ceph to do this instead of having a new plugin. This is
>> > something I would love to discuss in a first meeting.
>> i would advocate for pivoting devstack-plugin-ceph.
>> i dont think we have the capsity as a comunity to devleop, maintaine and
>> debug/support
>> 2 differnt ways of deploying ceph in our ci system in the long term.
>>
>> to me the way devstack-plugin-ceph install cpeh is jsut an implementaion
>> detail.
>> its contract is that it will install and configure ceph for use with
>> openstack.
>> if you make it use cephadm for that its just and internal detail that
>> should not
>> affect the consomes of the plugin provide you maintain the interface to
>> the devstack pluging
>> mostly the same.
>>
> Starting with pacific the deployment of Ceph is moved from ceph-ansible to
> cephadm: the implication of this change it's not just
> on the deployment side but this new component (which interacts with the
> ceph orchestrator module) is able to maintain the lifecycle
> of the deployed containers, so I'd say the new approach it's not just an
> implementation detail but also changes the way some components
> interact with Ceph.
> Manila using ganesha, for instance, it's the first component that should
> start using the orchestrator interface, so I guess it's worth
> aligning (and extending) the most popular dev installer to support the new
> way (like other projects already did).
>
>
>
>>
>> i would suggest addign a devstack macro initally to choose the backend
>> but then eventually
>> once the cephadm appoch is stable just swap the default.
>>
> +1 on choosing the backend and plan the switch when the cephadm approach
> is ready and works for all the openstack components
>
>>
>> >
>> > Having said this, I propose using the channel #openstack-cephadm in the
>> > OFTC network to talk about this and set up a first meeting with people
>> > interested in contributing to this effort.
>> ack im not sure i will get involed with this but the other option woudl
>> be to
>> just use #openstack-qa since that is the chanlle for devstack development.
>>
>
> Either #openstack-qa or a dedicated one works well , maybe #openstack-qa
> is useful to reach more people
> who can help / review the relevant changes .. wdyt
>
>>
>> >
>> > Thanks,
>> >
>> > Victoria
>> >
>> > [0] https://docs.ceph.com/en/pacific/cephadm/
>> > [1] https://github.com/vkmc/devstack-plugin-cephadm
>>
>>
>>
>
> --
> Francesco Pantano
> GPG KEY: F41BD75C
>


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