'Load instance information.'

def _load(self):

    try:
        with open(self.path, 'r') as instance_fd:
            self.instance_id = instance_fd.read()
            self.started = True
    except IOError as ex:
        if (ex.errno != errno.ENOENT):
            raise
        self.instance_id = None
    return self.instance_id
