[Postgresql] Adding config parameters

Change-Id: I578dd1ef341764d4ee002ad2cfdb3252f5695518

trove/guestagent/datastore/manager.py

@@ -402,7 +402,6 @@ class Manager(periodic_task.PeriodicTasks):
         self.app.update_overrides(overrides)
 
     def apply_overrides(self, context, overrides):
-        LOG.info(f"Applying overrides {overrides}.")
         raise exception.DatastoreOperationNotSupported(
             operation='apply_overrides', datastore=self.manager)
 

trove/guestagent/datastore/mysql_common/manager.py

@@ -184,8 +184,9 @@ class MySqlManager(manager.Manager):
         return False
 
     def apply_overrides(self, context, overrides):
-        LOG.info("Applying overrides (%s).", overrides)
+        LOG.info("Applying database config.")
         self.app.apply_overrides(overrides)
+        LOG.info("Finished applying database config.")
 
     def reset_password_for_restore(self, ds_version=None,
                                    data_dir='/var/lib/mysql/data'):

trove/guestagent/datastore/mysql_common/service.py

@@ -537,8 +537,6 @@ class BaseMySqlApp(service.BaseDbApp):
                 {MySQLConfParser.SERVER_CONF_SECTION: overrides})
 
     def apply_overrides(self, overrides):
-        LOG.info("Applying overrides to running MySQL, overrides: %s",
-                 overrides)
         with mysql_util.SqlClient(self.get_engine()) as client:
             for k, v in overrides.items():
                 byte_value = guestagent_utils.to_bytes(v)

trove/guestagent/datastore/postgres/manager.py

@@ -83,7 +83,10 @@ class PostgresManager(manager.Manager):
         self.app.start_db(ds_version=ds_version, command=command)
 
     def apply_overrides(self, context, overrides):
-        pass
+        """Reload config."""
+        LOG.info("Reloading database config.")
+        self.app.apply_overrides(overrides)
+        LOG.info("Finished reloading database config.")
 
     def get_datastore_log_defs(self):
         owner = cfg.get_configuration_property('database_service_uid')

trove/guestagent/datastore/postgres/service.py

@@ -150,6 +150,11 @@ class PgSqlApp(service.BaseDbApp):
     def reset_configuration(self, configuration):
         self.configuration_manager.save_configuration(configuration)
 
+    def apply_overrides(self, overrides):
+        """Reload config."""
+        cmd = "pg_ctl reload"
+        docker_util.run_command(self.docker_client, cmd)
+
     def start_db(self, update_db=False, ds_version=None, command=None,
                  extra_volumes=None):
         """Start and wait for database service."""