Enable inspector discovery by default

In order to make lives easier, this change enables the
ironic inspector to register newly discovered nodes
that boot on the PXE network.

Change-Id: I2b4a20ecb51391c586304c0c27f660f759b349e7

playbooks/roles/bifrost-ironic-install/README.md

@@ -193,6 +193,17 @@ inspector_store_ramdisk_logs: Boolean value, default true. Controls if the
                               inspector agent will retain logs from the
                               ramdisk that called the inspector service.
 
+enable_inspector_discovery: Boolean value, default true. This instructs
+                            inspector to add new nodes that are discovered
+                            via PXE booting on the same network to ironic.
+
+inspector_default_node_driver: The default driver to utilize when adding
+                               discovered nodes to ironic.
+                               The default value set by bifrost is
+                               `agent_ipmitool`. Users should change this
+                               setting for their install environment if
+                               an alternative default driver is required.
+
 ### Virtual Environment Install
 
 Bifrost can install ironic into a python virtual environment using the

playbooks/roles/bifrost-ironic-install/defaults/main.yml

@@ -126,6 +126,12 @@ inspector_port_addition: "pxe"
 # Note: inspector_keep_ports has three valid values: all, present, added
 inspector_keep_ports: "present"
 
+# Inspector defaults
+inspector:
+  discovery:
+    enabled: "{{ enable_inspector_discovery | default(true) }}"
+    default_node_driver: "{{ inspector_default_node_driver | default('agent_ipmitool')}}"
+
 # We may not have packaged iPXE files on some distros, or may want to
 # download them on their own.
 download_ipxe: false

playbooks/roles/bifrost-ironic-install/templates/ironic-inspector.conf.j2

@@ -27,11 +27,9 @@ add_ports = {{ inspector_port_addition | default('pxe') }}
 keep_ports = {{ inspector_keep_ports | default('present') }}
 ramdisk_logs_dir = {{ inspector_data_dir }}/log
 always_store_ramdisk_logs = {{ inspector_store_ramdisk_logs | default('true') | bool }}
-{#
-# Note(TheJulia): Preserving node_not_found_hook for potential future
-# use by bifrost.
-# The name of the hook to run when inspector receives inspection
-# information from a node it isn't already aware of. This hook is
-# ignored by default. (string value)
-#node_not_found_hook = <None>
-#}
+{% if inspector.discovery.enabled == true %}
+node_not_found_hook = enroll
+
+[discovery]
+enroll_node_driver = {{ inspector.discovery.enroll_node_driver | default('fake') }}
+{% endif %}

releasenotes/notes/enable-inspector-discovery-77aa6f5c1f1e42c6.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - Discovery of nodes via the ironic-inspector is now
+    enabled by default.  If you wish to disable this, set
+    ``enable_inspector_discovery`` to ``false`` and re-execute
+    the installation playbook.