Config Settings
---------------
-Each service may define a config_settings output variable which returns
-Hiera settings to be configured.
+Each service may define three ways in which to output variables to configure Hiera
+settings on the nodes.
+
+ * config_settings: the hiera keys will be pushed on all roles of which the service
+ is a part of.
+
+ * global_config_settings: the hiera keys will be distributed to all roles
+
+ * service_config_settings: Takes an extra key to wire in values that are
+ defined for a service that need to be consumed by some other service.
+ For example:
+ service_config_settings:
+ haproxy:
+ foo: bar
+ This will set the hiera key 'foo' on all roles where haproxy is included.
Deployment Steps
----------------
Steps/tages correlate to the following:
- 1) Quiesce the control-plane, e.g disable LoadBalancer, stop pacemaker cluster
-
- 2) Stop all control-plane services, ready for upgrade
-
- 3) Perform a package update, (either specific packages or the whole system)
+ 1) Stop all control-plane services.
+
+ 2) Quiesce the control-plane, e.g disable LoadBalancer, stop
+ pacemaker cluster: this will stop the following resource:
+ - ocata:
+ - galera
+ - rabbit
+ - redis
+ - haproxy
+ - vips
+ - cinder-volumes
+ - cinder-backup
+ - manilla-share
+ - rbd-mirror
+
+ The exact order is controlled by the cluster constraints.
+
+ 3) Perform a package update and install new packages: A general
+ upgrade is done, and only new package should go into service
+ ansible tasks.
4) Start services needed for migration tasks (e.g DB)