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+=============================================
+Container Management in Multi-Region Scenario
+=============================================
+
+Background
+==========
+
+Currently, multi-region container management is not supported in the Tricircle.
+This spec is to describe how container management will be implemented
+in the Tricircle multi-region scenario. Now openstack provides many components
+for container services such as zun,kuyr,kuryr-libnetwork. Zun is a component that
+provides container management service in openstack, it provides a unified OpenStack API
+for launching and managing containers, supporting docker container technology.
+Kuryr is an component that interfaces a container network to a neutron network.
+Kuryr-libnetwork is a kuryr plugin running under the libnetwork framework and provides
+network services for containers. Zun integrates with keystone, neutron,
+and glance to implement container management. Keystone provides identity authentication
+for containers, neutron provides network for containers, and glance provides images for containers.
+These openstack services work together to accomplish the multi-region container management.
+
+Overall Implementation
+======================
+
+The Tricircle is designed in a Central_Neutron-Local_Neutron fashion, where all the local neutrons are
+managed by the central neutron. As a result, in order to adapt the Central_Neutron-Local_Neutron design and
+the container network requirements and image requirements, we plan to deploy zun, kuryr,kuryr-libnetwork and
+raw docker engine as follows. ::
+
+ +--------------------------------------------------+                     +--------------------------------------------------+
+ |                                                  |    Central Region   |                                                  |
+ |        +--------+                             +--×---------------------×--+                             +--------+        |
+ |  +-----| Glance |                User   <---- |          Keystone         | ---->   User                | Glance |-----+  |
+ |  |     +--------+              x------x       +---------------------------+       x------x              +--------+     |  |
+ |  |                                |           |       Central Neutron     |           |                                |  |
+ |  |  +---------------+             |           +--×----^-----------^----×--+           |             +---------------+  |  |
+ |  |  |   Zun  API    |<------------+              |    |           |    |              +------------>|   Zun  API    |  |  |
+ |  |  +---------------+        +---------------+   |    |           |    |   +---------------+        +---------------+  |  |
+ |  |  |               |        |               |   |    |           |    |   |               |        |               |  |  |
+ |  +--+  Zun Compute  +--------+ Docker Engine |   |    |           |    |   | Docker Engine +--------+  Zun Compute  +--+  |
+ |     |               |        |               |   |    |           |    |   |               |        |               |     |
+ |     +-------+-------+        +-------+-------+   |    |           |    |   +-------+-------+        +-------+-------+     |
+ |             |                        |           |    |           |    |           |                        |             |
+ |             |                        |           |    |           |    |           |                        |             |
+ |     +-------+-------+        +-------+-------+   |    |           |    |   +-------+-------+        +-------+-------+     |
+ |     |               |        |               |   |    |           |    |   |               |        |               |     |
+ |     | Local Neutron +--------+     Kuryr     |   |    |           |    |   |     Kuryr     <--------> Local Neutron |     |
+ |     |               |        |  libnetwork   |   |    |           |    |   |  libnetwork   |        |               |     |
+ |     +-------+-------+        +---------------+   |    |           |    |   +---------------+        +-------+-------+     |
+ |             |                                    |    |           |    |                                    |             |
+ |             +------------------------------------×----+           +----×------------------------------------+             |
+ |                                                  |                     |                                                  |
+ +--------------------------------------------------+                     +--------------------------------------------------+
+                      Region One                                                               Region Two
+
+                                Fig. 1 The multi-region container management architecture.
+
+As showned in the Fig. 1 above, in Tricircle, each region has already installed
+a local neutron. In order to accomplish container management in Tricircle,
+admins need to configure and install zun,docker,kuryr and kuryr-libnetwork.
+Under the Central_Neutron-Local_Neutron scenario, we plan to let zun employ
+the central neutron in Central Region to manage networking resources, meanwhile
+still employ docker engine in its own region to manage docker container instance.
+Then, use kuryr/kuryr-libnetwork to connect the container network to the neutron network.
+Hence, the workflow of container creation in Tricircle can be described as follows. ::
+
+ +-----------------------------------------------------------------------------------------------------------------------------------------------+
+ |                                                  +---------------+    +---------------+    +-----------------+    +-------------------------+ |
+ |             +----------+                     +-->| neutronClient | -->| Local Neutron | -->| Central Neutron | -->|Neutron network and port | |
+ |    +------->| Keystone |                     |   +---------------+    +------^--------+    +--------+--------+    +-------------+-----------+ |
+ |    |        +----------+                     |                               |                      |                           |             |
+ |    |                                         |   +------------------+        +----------------------+         +-----------------+-----------+ |
+ |    |                                         +-->| kuryr/libnetwork | --------------------------------------->|Connect container to network | |
+ | +--+---+    +---------+    +-------------+   |   +------------------+                                         +-----------------+-----------+ |
+ | | User | -->| Zun API | -->| Zun Compute | --+                                                                                  |             |
+ | +------+    +---------+    +-------------+   |   +--------------+    +--------------+                                           |             |
+ |                                              +-->| glanceClient | -->| docker image |                                     +=====+=====+       |
+ |                                              |   +--------------+    +------+-------+                                     ‖ Container ‖       |
+ |                                              |                              |                                             +=====+=====+       |
+ |                                              |   +------------+    +--------V---------------+                                   |             |
+ |                                              +-->| Docker API | -->| Create docker instance | ----------------------------------+             |
+ |                                                  +------------+    +------------------------+                                                 |
+ +-----------------------------------------------------------------------------------------------------------------------------------------------+
+                                             Fig. 2 The multi-region container creation workflow.
+
+Specifically, when a tenant attempts to create container, he/she needs to
+send a request to Zun API. Then it will call zun compute driver to create
+a container in four sub-steps. Firstly, call network_api(neutronClient) to
+process neutron network(use Central_Neutron-Local_Neutron mechanism). Secondly,
+call image_api(glanceClient) to provide docker image. Thirdly, call docker API
+to create docker instance. Finally, use kuryr connect container to neutron network.
+So far, a container can successfully created in Tricircle environment. Considering
+the Tricircle is dedicated to enabling networking automation across Neutrons, so we
+can implement the interconnection among multiple containers in multi-region scenario.
+As shown below. ::
+
+  +------------------------+   +-------------------+   +------------------------+
+  |    net1                |   |                   |   |               net1     |
+  | +---------+--------------------------+-------------------------+----------+ |
+  |           |            |   |         |         |   |           |            |
+  |           |            |   |         |         |   |           |            |
+  |     +-----+------+     |   |         |         |   |     +-----+------+     |
+  |     | Container1 |     |   |    +----+----+    |   |     | Container2 |     |
+  |     +------------+     |   |    |         |    |   |     +------------+     |
+  |                        |   |    |  Router |    |   |                        |
+  |     +-----+------+     |   |    |         |    |   |     +-----+------+     |
+  |     | Container3 |     |   |    +----+----+    |   |     | Container4 |     |
+  |     +-----+------+     |   |         |         |   |     +-----+------+     |
+  |           |            |   |         |         |   |           |            |
+  |           |            |   |         |         |   |           |            |
+  | +---------+--------------------------+-------------------------+----------+ |
+  |    net2                |   |                   |   |               net2     |
+  |                        |   |                   |   |                        |
+  | +--------------------+ |   | +---------------+ |   | +--------------------+ |
+  | |   Local  Neutron   | |   | |Central Neutron| |   | |   Local  Neutron   | |
+  | +--------------------+ |   | +---------------+ |   | +--------------------+ |
+  +------------------------+   +-------------------+   +------------------------+
+         Region One               Central Region              Region Two
+
+          Fig. 3 The container interconnection in multi-region scenario.
+
+Although, combined with Tricircle, we can also implement the container deletion,
+the container modification, the container lookup and so on in multi-region scenario.
+That means we can implement container management in multi-region scenario.
+
+
+Data Model Impact
+-----------------
+
+None
+
+Dependencies
+------------
+
+None
+
+Documentation Impact
+--------------------
+
+None
+
+References
+----------
+
+None