diff --git a/docs/openstack_guidelines.rst b/docs/openstack_guidelines.rst
index d4811970..64302c8d 100644
--- a/docs/openstack_guidelines.rst
+++ b/docs/openstack_guidelines.rst
@@ -62,6 +62,9 @@ Libraries
 * All OpenStack API interactions should happen via the openstacksdk and not via
   OpenStack Client libraries. The OpenStack Client libraries do no have end
   users as a primary audience, they are for intra-server communication.
+* All modules should be registered in ``meta/action_groups.yml`` for enabling the
+  variables to be set in `group level
+  <https://docs.ansible.com/ansible/latest/user_guide/playbooks_module_defaults.html>`.
 
 Testing
 -------
diff --git a/meta/action_groups.yml b/meta/action_groups.yml
new file mode 100644
index 00000000..c00f966d
--- /dev/null
+++ b/meta/action_groups.yml
@@ -0,0 +1,56 @@
+os:
+- os_auth
+- os_client_config
+- os_coe_cluster
+- os_coe_cluster_template
+- os_flavor_info
+- os_floating_ip
+- os_group
+- os_group_info
+- os_image
+- os_image_info
+- os_ironic
+- os_ironic_inspect
+- os_ironic_node
+- os_keypair
+- os_keystone_domain
+- os_keystone_domain_info
+- os_keystone_endpoint
+- os_keystone_role
+- os_keystone_service
+- os_listener
+- os_loadbalancer
+- os_member
+- os_network
+- os_networks_info
+- os_nova_flavor
+- os_nova_host_aggregate
+- os_object
+- os_pool
+- os_port
+- os_port_info
+- os_project
+- os_project_access
+- os_project_info
+- os_quota
+- os_recordset
+- os_router
+- os_routers_info
+- os_security_group
+- os_security_group_rule
+- os_server
+- os_server_action
+- os_server_group
+- os_server_info
+- os_server_metadata
+- os_server_volume
+- os_stack
+- os_subnet
+- os_subnets_info
+- os_user
+- os_user_group
+- os_user_info
+- os_user_role
+- os_volume
+- os_volume_snapshot
+- os_zone