Improve Blazar integration with Nova

As of today we do not have any means of Blazar integration with Nova,
while we do provide roles for Blazar installation for a while now. This
patch aims to bring in more native integration and remove necessity
of overrides for such deployment.

Related-Bug: #2048048
Co-Authored-By: Alexey Rusetsky <fenuks@fenuks.ru>
Change-Id: Ica50a5504de1b1604f72123751cbb3f45c85ab46

defaults/main.yml

@@ -16,6 +16,8 @@
 
 # Enable/Disable barbican configurations
 nova_barbican_enabled: "{{ (groups['barbican_all'] is defined) and (groups['barbican_all'] | length > 0) }}"
+# Enable/Disable blazar configurations
+nova_blazar_enabled: "{{ (groups['blazar_all'] is defined) and (groups['blazar_all'] | length > 0) }}"
 # Enable/Disable designate configurations
 nova_designate_enabled: "{{ (groups['designate_all'] is defined) and (groups['designate_all'] | length > 0) }}"
 # Notification topics for designate.
@@ -358,6 +360,9 @@ nova_scheduler_default_filters:
   - ServerGroupAffinityFilter
   - NUMATopologyFilter
 
+nova_blazar_scheduler_filters:
+  - BlazarFilter
+
 nova_scheduler_extra_filters: []
 
 # This should be tuned depending on the number of compute hosts present in the
@@ -538,6 +543,9 @@ nova_services:
     start_order: 5
     execstarts: "{{ nova_bin }}/nova-serialproxy {{ nova_backend_ssl | ternary('--ssl_only --cert ' ~ nova_ssl_cert ~ ' --key ' ~ nova_ssl_key, '') }}"
 
+nova_blazar_pip_packages:
+  - blazar-nova
+
 nova_novnc_pip_packages:
   - websockify
 

releasenotes/notes/blazar_nova_integration-c8057dcc2ccc162a.yaml

@@ -0,0 +1,11 @@
+---
+features:
+  - |
+    Added extra variables to allow control Blazar integration with Nova:
+
+      * ``nova_blazar_enabled`` (bool) - Control if Blazar integration should
+        be configured
+      * ``nova_blazar_scheduler_filters`` (list) - Extra filters that will be
+        enabled in Nova scheduler
+      * ``nova_blazar_pip_packages`` (list) - Extra Python packages that will
+        be installed on Nova scheduler hosts

templates/nova.conf.j2

@@ -317,6 +317,10 @@ discover_hosts_in_cells_interval = {{ nova_discover_hosts_in_cells_interval }}
 
 [filter_scheduler]
 max_io_ops_per_host = {{ nova_max_io_ops_per_host }}
+{% if nova_blazar_enabled and nova_blazar_scheduler_filters %}
+available_filters = nova.scheduler.filters.all_filters
+available_filters = blazarnova.scheduler.filters.blazar_filter.BlazarFilter
+{% endif %}
 enabled_filters = {{ _nova_scheduler_filters | join(',') }}
 host_subset_size = {{ nova_scheduler_host_subset_size }}
 track_instance_changes = {{ nova_scheduler_tracks_instance_changes }}

vars/main.yml

@@ -47,6 +47,11 @@ nova_venv_packages: |-
   {%- if nova_oslomsg_amqp1_enabled | bool %}
   {%-   set _ = pkg_list.extend(nova_optional_oslomsg_amqp1_pip_packages) %}
   {%- endif %}
+  {%- if nova_blazar_enabled | bool %}
+  {%-   if (nova_services['nova-scheduler']['group'] in group_names) %}
+  {%-     set _ = pkg_list.extend(nova_blazar_pip_packages) %}
+  {%-   endif %}
+  {%- endif %}
   {%- if ('novnc' in nova_console_proxy_types) %}
   {%-   set _ = pkg_list.extend(nova_novnc_pip_packages) %}
   {%- endif %}
@@ -137,6 +142,9 @@ _nova_scheduler_filters: |-
   {% else %}
   {%   set filters = default_filters %}
   {% endif %}
+  {% if nova_blazar_enabled | bool %}
+  {%   set _ = filters.extend(nova_blazar_scheduler_filters) %}
+  {% endif %}
   {{ filters + nova_scheduler_extra_filters }}
 
 _qemu_default_conf_dict: |-