core.py 文件源码

def db_sync(self):
        """Perform a database sync using the command defined in the
        self.sync_cmd attribute. The services defined in self.services are
        restarted after the database sync.
        """
        if not self.db_sync_done() and hookenv.is_leader():
            subprocess.check_call(self.sync_cmd)
            hookenv.leader_set({'db-sync-done': True})
            # Restart services immediately after db sync as
            # render_domain_config needs a working system
            self.restart_all()