Document load balancer usage

Document how to use load balancer. Make special note that pays user
attention that exclusive or distributed router attachment is required
for load balancer to work.

While here correct 'reseted' to 'reset'.

Change-Id: Idd6872b98434536bd7d4f5c5538c7b0fe14eaee3

doc/user/source/usage.rst

@@ -56,10 +56,75 @@ NSX Edge nodes.
 
   $ neutron net-create External --router:external --provider:physical_network network-222
 
+Starting from version 2.0.0 plugin enables Neutron load balancing functionality
+and enables it in OpenStack dashboard (Horizon).
+
+.. note::
+
+  Load balancing functionality requires attachment of an **exclusive** or
+  **distributed** router to the subnet prior to provisioning of an load
+  balancer.
+
+Create exclusive or distributed router and connect it to subnet.
+
+.. code-block:: bash
+
+  $ neutron router-create --router_type exclusive r1
+  $ neutron router-interface-add r1 private-subnet
+
+Create servers.
+
+.. code-block:: bash
+
+  $ nova boot --image <image-uuid> --flavor m1.small www1
+  $ nova boot --image <image-uuid> --flavor m1.small www2
+
+Create a load balancer pool.
+
+.. code-block:: bash
+
+  $ neutron lb-pool-create --lb-method ROUND_ROBIN --protocol HTTP --name http-pool \
+        --subnet-id <private-subnet-id>
+
+Create members.
+
+.. code-block:: bash
+
+  $ neutron lb-member-create --address <www1-ip> --protocol-port 80 http-pool
+  $ neutron lb-member-create --address <www2-ip> --protocol-port 80 http-pool
+
+Create a virtual IP address.
+
+.. code-block:: bash
+
+  $ neutron lb-vip-create --name lb_vip --subnet-id <private-subnet-id> \
+        --protocol-port 80 --protocol HTTP http-pool
+
+Allocate floating IP and associate it with VIP.
+
+.. code-block:: bash
+
+  $ neutron floatingip-create <public-net> --port-id <vip-port-uuid>
+
+Add rule that will allow HTTP traffic.
+
+.. code-block:: bash
+
+  $ neutron security-group-rule-create --protocol tcp --port-range-min 80 \
+        --port-range-max 80 default
+
+
+Create a healthmonitor and associate it with the pool.
+
+.. code-block:: bash
+
+  $ neutron lb-heathmonitor-create --delay 3 --type HTTP --max-retries 3
+        --timeout 5 --pool http-pool
+  $ neutron lb-healthmonitor-associate <healthmonitor_name> http-pool
 
 OpenStack environment reset/deletion
 ------------------------------------
 
 Fuel NSXv plugin does not provide cleanup functionality when OpenStack
-environment gets reseted or deleted.  All logical switches and edge virtual
+environment gets reset or deleted.  All logical switches and edge virtual
 machines remain intact, it is up to operator to delete them and free resources.