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+Configuration Pusher
+====================
+
+Once the SD-Fabric has been deployed to the Kubernetes, a special Kubernetes
+pod, config pusher will enter to a reconciliation loop to update both
+network configuration and component configuration to ONOS controller.
+
+Config pusher will read running state from ONOS controller and
+then update the ONOS with desired state if running state isn't same as desired state.
+
+.. image:: ../images/config-pusher.svg
+
+.. note::
+   We highly recommend using the Helm Chart to update the configuration instead of manually changing the ONOS unless you're working on debugging or testing.
+
+Config Pusher supports variety options to adjust its behavior and you can change it via Helm Chart's value file.
+
+Below is the default values of config pusher and please change it to meet your environment.
+
+
+.. code-block::
+
+      onos:
+        config:
+          reconcile_mode: true
+          reconcile_interval: 30s
+          image:
+            registry: ""
+            repository: opencord/onos-classic-helm-utils
+            tag: 0.1.0
+            pullPolicy: "IfNotPresent"
+          service_account_name: onos-config-loader
+          # NOTE that these values won't change the configuration in the ONOS container, they are only used in the script that loads the config
+          username: karaf
+          password: karaf
+          # netcfg: >
+          #  {}
+          # componentConfig:
+          #   "org.onosproject.provider.lldp.impl.LldpLinkProvider": >
+          #     {
+          #       "enabled": "false"
+          #     }
+
+
+* ``reconcile_mode``: If disable, config pusher will only update the configuration once, it's useful for debugging.
+* ``reconcile_interval``: The interval(seconds) config pusher used to perform reconciliation loop.
+* ``image``: About how to pull config pusher's container image, keep it default unless you have special requirement.
+
+  * ``registry``: If empty, the config pusher image will be downloaded from Docker Hub.
+  * ``repository``: The repository of config push.
+  * ``tag``: The image tag of config pusher.
+  * ``pullPolicy``: How Kubernetes pull the image, available options are `Never, Always, IfNotPresent`.
+
+* ``service_account_name``: Name of the Kubernetes Service Account, config pusher pods needs the permission to read
+  information from Kubernetes.
+* ``username``: Username is used to access ONOS,
+* ``password``: Password is used to access ONOS.
+* ``netcfg``: Json data for network configuration.
+* ``componentConfig``: A map contains "component-name": "json config" that will be iterated
+  over and sent via POST to ONOS.