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===== Scenario: Two VMs connected to public network via private network. =====

Links:
  * https://blogs.oracle.com/ronen/entry/diving_into_openstack_network_architecture3
  * http://docs.openstack.org/user-guide/dashboard_create_networks.html

==== Prerequisite ====

  * [[https://wiki.opnfv.org/copper/copper_work_items/academy/foreman|Bare-metal Multi-node single-NIC install using Foreman]]
  *  On controller, setup CLI environment for access to OpenStack APIs
    * http://docs.openstack.org/user-guide/common/cli_set_environment_variables_using_openstack_rc.html
    * Horizon: select Project / Access & Security / Download OpenStack RC File
<code>
[root@oscontroller1 ~]# vi admin-openrc.sh
# (paste admin-openrc.sh contents downloaded)
[root@oscontroller1 ~]# source  admin-openrc.sh
</code>


==== Verification Procedure =====

1) Create image cirros-0.3.3-x86_64
  * Horizon: From Project / Compute / Images, select "Create Image". Set options Name "cirros-0.3.3-x86_64", Image Location "http://download.cirros-cloud.net/0.3.3/cirros-0.3.3-x86_64-disk.img", Format "QCOW2", Architecture "x86_64", (leave other options as-is or blank), and select "Create Image".
  * CLI:

2) Verify that an external network and subnet exists (subnet "192.168.1.0/24", no DHCP) in Project / Network / Networks. For base-metal single-NIC non-HA install, you may need to create the external network via the CLI, if not already created as in [[https://wiki.opnfv.org/copper/copper_work_items/academy/foreman|Bare-metal Multi-node single-NIC install using Foreman]].
  * Horizon: apparently no current (Juno) option to designate a new network as "external". Have to do this via the CLI
  * CLI:
<code>
[root@oscontroller1 ~]# neutron net-create external1 -- --router:external=true --provider:network_type=flat --provider:physical_network=physnet1
Created a new network:
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | True                                 |
| id                        | d7868a94-47ec-4ec7-93cc-645d3bc45898 |
| name                      | external1                            |
| provider:network_type     | flat                                 |
| provider:physical_network | physnet1                             |
| provider:segmentation_id  |                                      |
| router:external           | True                                 |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tenant_id                 | c3b15e900f0f4c7ab01576bb28d34f10     |
+---------------------------+--------------------------------------+
[root@oscontroller1 ~]# neutron subnet-create --disable-dhcp external1 192.168.1.0/24
Created a new subnet:
+-------------------+--------------------------------------------------+
| Field             | Value                                            |
+-------------------+--------------------------------------------------+
| allocation_pools  | {"start": "192.168.1.2", "end": "192.168.1.254"} |
| cidr              | 192.168.1.0/24                                   |
| dns_nameservers   |                                                  |
| enable_dhcp       | False                                            |
| gateway_ip        | 192.168.1.1                                      |
| host_routes       |                                                  |
| id                | 2a6a6be2-2ea2-4a38-84cd-3a2e9e3197e8             |
| ip_version        | 4                                                |
| ipv6_address_mode |                                                  |
| ipv6_ra_mode      |                                                  |
| name              |                                                  |
| network_id        | d7868a94-47ec-4ec7-93cc-645d3bc45898             |
| tenant_id         | c3b15e900f0f4c7ab01576bb28d34f10                 |
+-------------------+--------------------------------------------------+
</code>

3) Create internal network.
  * Horizon: From Project / Network / Networks, select "Create Network". Set options Name "internal1", select "Next", Subnet Name "internal1", Network Address "10.0.0.1/24", select "Next" (leave other options as-is or blank), Allocation Pools "10.0.0.2,10.0.0.254", DNS Name Servers "8.8.8.8", select "Create" (leave other options as-is or blank).
  * CLI:

4) Create router
  * Horizon: From Project / Network / Routers, select "Create Router". Set options Name "external", Connected External Network: external1, Select "Set Gateway", select External Network "external1", and select "Set Gateway". Select elect "Add Interface" (leave other options as-is or blank).
  * CLI:

5) Add internal network interface to the router.
  * Horizon: From Project / Network / Routers, select router "external", and select "Add Interface". Select Subnet "internal", and select "Add Interface" (leave other options as-is or blank). Note: you may get disconnected fromt the Controller node for a short time 
  * CLI:

6) Launch images
  * Horizon: From Project / Compute / Images, select "Launch" for image "cirros-0.3.3-x86_64". Select Name "cirros-1", network "internal", and "Launch". Leave other options as-is or blank. Repeat for instance "cirros-2".
  * CLI:

7) Verify connectivity from VMs. 
  * Horizon: From Project / Compute / Instances, select "cirros-1" and "Console", and login with account "cirros" / "cubswin:)". Ping address of cirros-2 as shown in Horizon, 192.168.1.1 (external router), and opnfv.org (to validate DNS operation).
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