Add README example docs, etc.

README.rst

@@ -2,7 +2,7 @@
 os-net-config
 ===============================
 
-OpenStack network configuration
+host network configuration tool
 
 This is an initial implementation towards the 'network configuration' spec @
 https://review.openstack.org/#/c/97859/ The intention is for this code to be
@@ -17,7 +17,107 @@ Features
 --------
 
 The core aim of this project is to allow fine grained (but extendable)
-configuration of the networking parameters for a network host. At present
-this host configuration is performed by the ensure-bridge and init-neutron-ovs
-tripleo element scripts. More details are available in the specification
-linked to above.
+configuration of the networking parameters for a network host. The
+project consists of:
+
+ * A python library which provides configuration via an object model.
+
+ * A CLI (os-net-config) which provides configuration via a JSON file format.
+   By default os-net-config uses a JSON config file located at
+   /etc/os-net-config/config.json. This can be customized via the
+   --config-file CLI option.
+
+JSON Config Examples
+--------------------
+ * Configure an OVS bridge with a single attached interface (port)
+
+.. code-block:: json
+
+ { "network_config": [
+         {
+             "type": "ovs_bridge",
+             "name": "br-ctlplane",
+             "use_dhcp": "true",
+             "members": [
+                 {
+                     "type": "interface",
+                     "name": "em1"
+                 }
+             ]
+         }
+     ]
+ }
+
+..
+
+
+ * Configure an OVS bridge on top of an OVS bond
+
+.. code-block:: json
+
+ { "network_config": [
+         {
+             "type": "ovs_bridge",
+             "name": "br-ctlplane",
+             "use_dhcp": "true",
+             "members": [
+                 {
+                     "type": "ovs_bond",
+                     "name": "bond1",
+                     "use_dhcp": "true",
+                     "members": [
+                         { "type": "interface", "name": "em1" },
+                         { "type": "interface", "name": "em2" }
+                     ]
+                 }
+             ]
+         }
+     ]
+ }
+
+..
+
+ * Configure a tagged VLAN interface on top of an OVS bridge
+
+.. code-block:: json
+
+ { "network_config": [
+         {
+             "type": "ovs_bridge",
+             "name": "br-ctlplane",
+             "members": [
+                 {
+                     "type": "vlan",
+                     "device": "em1",
+                     "vlan_id": "16",
+                     "addresses": [{
+                         "ip_netmask": "192.0.2.1/24"
+                     }],
+                     "routes": [{
+                         "next_hop": "192.0.2.1",
+                         "ip_netmask": "192.0.2.1/24"
+                     }]
+                 }
+             ]
+         }
+     ]
+ }
+
+..
+
+Provider Configuration
+----------------------
+Providers are use to apply (implement) the desired configuration on the
+host system. By default 3 providers are implemented:
+
+ * Ifcfg: persistent network config format stored in
+   /etc/sysconfig/network-scripts
+
+ * ENI: persistent network config format stored in /etc/network/interfaces
+
+ * iproute2: non-persistent provider which implements the config using
+   iproute2, vconfig, etc...
+
+When using bin/os-net-config the provider is automatically selected based on
+the host systems perferred persistent network type (ifcfg or ENI). This can
+be customized via the --provider CLI option.