docs: def start(self):
          """Start the daemon"""
          if self._already_running():
              message = 'pid file %s already exists. Daemon already running?\n'
              sys.stderr.write(message % self.pid_file)
              return 0
          self.set_gid()
          self.set_uid()
          # Create log files (if configured) with the new user/group. Creating
          # them as root would allow symlink exploits.
          self.setup_logging()
          # Create pid file with new user/group. This ensures we will be able
          # to delete the file when shutting down.
          self.daemonize()
          try:
              self.run()
          except Exception:
              self.logger.exception('Exception while running the daemon:')
              return 1
          return 0