Support configuration of resource providers with config files

Resource providers can be configured using the API or CLI, or they
can also be configured on a per-compute node basis using config
files stored in /etc/nova/provider_config.

This patch adds support for a user defined list of provider config
files to be created on the compute nodes. This can be specified in
user_variables or perhaps more usefully in group_vars/host_vars.
A typical use case would be describing the resources made available
as a result of GPU or other hardware installed in a compute node.

Change-Id: I13d70a1030b1173b1bc051f00323e6fb0781872b

defaults/main.yml

@@ -406,6 +406,31 @@ nova_api_threads: "{{ [[(ansible_facts['processor_vcpus']//ansible_facts['proces
 #  "compute:create": ""
 #  "compute:create:attach_network": ""
 
+## Resource provider vars
+# Optionally specify a set of resource providers that a particular compute node exposes
+# See https://docs.openstack.org/nova/latest/admin/managing-resource-providers.html
+nova_provider_overrides: []
+# nova_provider_overrides:
+#   - name: my_provider
+#     content:
+#       meta:
+#         schema_version: '1.0'
+#       providers:
+#         - identification:
+#             name: 'EXAMPLE_RESOURCE_PROVIDER'
+#           inventories:
+#             additional:
+#               - CUSTOM_EXAMPLE_RESOURCE_CLASS:
+#                  total: 100
+#                  reserved: 0
+#                  min_unit: 1
+#                  max_unit: 10
+#                  step_size: 1
+#                  allocation_ratio: 1.0
+#           traits:
+#             additional:
+#               - 'CUSTOM_EXAMPLE_TRAIT'
+
 nova_service_in_ldap: "{{ service_ldap_backend_enabled | default(False) }}"
 
 ## libvirtd config options

releasenotes/notes/nova-resource-provider-config-files-a7ff9303bba083f9.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    Support is added to the os_nova ansible role to deploy resource provider
+    config files to nova compute nodes. This allows automatic configuraion
+    of resource providers without having to use the openstack API or
+    command line.

tasks/nova_post_install.yml

@@ -93,6 +93,22 @@
     - nova-config
     - nova-policy-override
 
+- name: Implement compute host provider.yaml if there are overrides configured
+  openstack.config_template.config_template:
+    content: "{{ item.content }}"
+    dest: "/etc/nova/provider_config/{{ item.name }}.yaml"
+    owner: "root"
+    group: "{{ nova_system_group_name }}"
+    mode: 0640
+    config_type: yaml
+  with_items:
+    - "{{ nova_provider_overrides }}"
+  when:
+    - nova_services['nova-compute']['group'] in group_names
+  tags:
+    - nova-config
+    - nova-provider-override
+
 - name: Remove legacy policy.yaml file
   file:
     path: "/etc/nova/policy.yaml"

tasks/nova_pre_install.yml

@@ -93,6 +93,9 @@
       state: link
       force: true
       condition: "{{ nova_install_method == 'source' }}"
+    - path: "/etc/nova/provider_config"
+      owner: "root"
+      mode: "0640"
     - path: "/etc/sudoers.d"
       mode: "0750"
       owner: "root"