Adding architecture options

As there are different architecture options
to support VM and contaienr based VNF-s it
is important to list these options and refer
to them in the gap analyzis of the different
projects.

Change-Id: Iff027e96ba48616cbb6705c33cda2cd8086eb97e
Signed-off-by: csatari <gergely.csatari@nokia.com>

2 files changed, 76 insertions, 1 deletions

diff --git a/docs/development/gapanalysis/gap-analysis-architecture-options.rst b/docs/development/gapanalysis/gap-analysis-architecture-options.rst
new file mode 100644
index 0000000..c629dfe
--- /dev/null
+++ b/docs/development/gapanalysis/gap-analysis-architecture-options.rst
@@ -0,0 +1,73 @@
+.. This work is licensed under a Creative Commons Attribution 4.0 International
+.. License. http://creativecommons.org/licenses/by/4.0
+.. (c) Gergely Csatari (Nokia)
+
+==================================
+OpenRetriever architecture options
+==================================
+
+1 Architecture options to support only containers on bare metal
+...............................................................
+To support containers on bare metal without the support of VM-s only a single
+VIM is needed.
+This architecture option is targeted by OpenRetriever in OPNFV Euphrates, and
+this architecture option is considered in the gap analyzis against
+:doc:`OpenStack <gap-analysis-openstack>` and
+:doc:`Kubernetes <gap-analysis-kubernetes-v1.5>`.
+Examples: Kubernetes, OpenStack with Zun_ and Kuryr_, which as a side effect
+also supports VM-s.
+
+2 Architecture options to support containers and VM-s
+.....................................................
+There are different architecture options to support container based and VM based
+VNF-s in OPNFV. This section provides a list of these options with a brief
+description and examples.
+In the descriptions providing the same API means, that the same set of API-s are
+used (like the OpenStack_ API-s or the Kubernetes_ API), integrted networks mean,
+that the network connections of the workloads can be connected without leaving
+the domain of the VIM and shared hardware resources mean that it is possible to
+start a workload VM and a workload container on the same physical host.
+
+2.1 Separate VIM-s
+==================
+There is a separate VIM for VM-s and a separate for containers, they use
+different hardware pools, they provide different API-s and their networks are
+not integrated.
+Examples: A separate OpenStack instance for the VM-s and a separate Kubernetes_
+instance for the containers.
+
+2.2 Single VIM
+==============
+One VIM supports both VM-s and containers using the same hardware pool, with
+the same API and with integrated networking solution.
+Examples: OpenStack with Zun_ and Kuryr_ or Kubernetes_ with Kubevirt_, Virtlet_ or
+similar.
+
+2.3 Combined VIM-s
+==================
+There are two VIM-s from API perspective, but usually the VIM-s share hardware
+pools on some level. This option have suboptions.
+
+2.3.1 Container VIM on VM VIM
+-----------------------------
+A container VIM is deployed on top of resources managed by a VM VIM, they share
+the same hardware pool, but they have separate domains in the pool, they provide
+separate API-s and there are possibilities to integrate their networks.
+Example: A Kubernetes_ is deployed into VM-s or bare metal hosts into an
+OpenStack deployment optionally with Magnum. Kuryr_ integrates the networks on
+some level.
+
+2.3.2 VM VIM on Container VIM
+-----------------------------
+A VM VIM is deployed on top of resources managed by a container VIM, they do not
+share the same hardware pool, provide different API and do not have integrated
+networks.
+Example: `Kolla Kubernetes <https://github.com/openstack/kolla-kubernetes>`_ or
+`OpenStack Helm <https://wiki.openstack.org/wiki/Openstack-helm>`_.
+
+.. _Kubernetes: http://kubernetes.io/
+.. _Kubevirt: https://github.com/kubevirt/
+.. _Kuryr: https://docs.openstack.org/developer/kuryr/
+.. _OpenStack: https://www.openstack.org/
+.. _Virtlet: https://github.com/Mirantis/virtlet
+.. _Zun: https://wiki.openstack.org/wiki/Zun
diff --git a/docs/development/gapanalysis/index.rst b/docs/development/gapanalysis/index.rst
index 08b0925..d29cea3 100644
--- a/docs/development/gapanalysis/index.rst
+++ b/docs/development/gapanalysis/index.rst
@@ -16,7 +16,9 @@ OpenRetriever Gap Analysis
            Official Release and Kubernetes Official Release.
 
 .. toctree::
-   maxdepth:2
+   :maxdepth: 2
+
+   gap-analysis-architecture-options
    gap-analysis-opnfv-installer.rst
    gap-analysis-openstack.rst
    gap-analysis-kubernetes-v1.5.rst