Start the process

1. cinder/cmd/scheduler.py

Create a service and wait for its exit

server = service.Service.create(binary='cinder-scheduler')
service.serve(server)
service.wait()
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2. cinder/service.py

2.1 Class Service: create

Executed before init, the main topic is initialized to concatenate manager = ‘scheduler_manager’

if not host:
    host = CONF.host
if not binary:
    binary = os.path.basename(inspect.stack()[-1][1])
if not topic:
    topic = binary
if not manager:
    subtopic = topic.rpartition('cinder-')[2]
    manager = CONF.get('%s_manager' % subtopic, None)
    # (Pdb) ! print(manager)
    # cinder.scheduler.manager.SchedulerManager
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2.2 Class Service: init

self.manager_class_name = manager
manager_class = importutils.import_class(self.manager_class_name)

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2.3 Starting the Scheduler