[openstack-dev] [TripleO] Plan management refactoring for Life cycle

Jiri Tomasek jtomasek at redhat.com
Mon Sep 10 16:11:46 UTC 2018

Hi Mathieu,

Thanks for bringing up the topic. There are several efforts currently in
progress which should lead to solving the problems you're describing. We
are working on introducing CLI commands which would perform the deployment
configuration operations on deployment plan in Swift. This is a main step
to finally reach CLI and GUI compatibility/interoperability. CLI will
perform actions to configure deployment (roles, networks, environments
selection, parameters setting etc.) by calling Mistral workflows which
store the information in deployment plan in Swift. The result is that all
the information which define the deployment are stored in central place -
deployment plan in Swift and the deploy command is turned into simple
'openstack overcloud <planName> deploy'. Deployment plan then has
plan-environment.yaml which has the list of environments used and
customized parameter values, roles-data.yaml which carry roles definition
and network-data.yaml which carry networks definition. The information
stored in these files (and deployment plan in general) can then be treated
as source of information about deployment. The deployment can then be
easily exported and reliably replicated.

Here is the document which we put together to identify missing pieces
between GUI,CLI and Mistral TripleO API. We'll use this to discuss the
topic at PTG this week and define work needed to be done to achieve the
complete interoperability. [1]

Also there is a pending patch from Steven Hardy which aims to remove CLI
specific environments merging which should fix the problem with tracking of
the environments used with CLI deployment. [2]

[1] https://gist.github.com/jtomasek/8c2ae6118be0823784cdafebd9c0edac
(Apologies for inconvenient format, I'll try to update this to
better/editable format. Original doc:
[2] https://review.openstack.org/#/c/448209/

-- Jirka

On Mon, Sep 10, 2018 at 8:05 AM mathieu bultel <mbultel at redhat.com> wrote:

> Hi folks,
> Last week I wrote a BluePrint and a spec [1] to propose to change the way
> we used and managed the Plan in TripleO for the Deployment and the Life
> cycle (update/upgrade and scale).
> While I was working on trying to simplified the implementation of the
> Update and Upgrade for a end user usage, I found very hard to follow all
> the calls that the TripleO Client was doing to the HeatClient and
> SwiftClient.
> I traced the calls and found that we can safely and easily decrease the
> number of calls and simplified the way that we are computing & rendering
> the TripleO Heat Templates files.
> I did a PoC to see what would be the problematic behind that and what we
> could do without breaking the "standard" usage and all the particular
> things that the current code handle (specific deployments and
> configurations & so on).
> By this refactoring I'm seeing another gain for the life cycle part of
> TripleO, where we used to try to make thing simpler & safer but we
> constantly failed due to this complexity and all the "special cases" that
> we faced during the testing.
> The result is that, when a user need to perform an update/upgrade of his
> deployment, he really have to be careful, to pay a lot of attention of all
> the options, -e environments files that he previously used  with the risk
> to make a simple mistake, and totally mess up the deployment.
> So my goals with this PoC and this BP is to try to addressed those points
> by:
> simplify  and reduce the number of calls between the clients,
> have a simple way for creating and updating the Plan, even by amending the
> plan with only a particular files / config or Playbooks,
> store all the in formations provided by the user by uploading all the
> files outsides of the plan,
> keep the track of the environment files passed to the CLI,
> trace the life cycle story of the deployment.
> So feel free to comment, add your concerns or feedback around this.
> Cheer,
> Mathieu
> [1]
> https://blueprints.launchpad.net/tripleo/+spec/tripleo-plan-management
> https://review.openstack.org/599396
> [2]
>  https://review.openstack.org/583145
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