def _get_instance(self):
try:<EOL><INDENT>instance = self.compute_driver.ex_get_node(<EOL>self.running_instance_id,<EOL>zone=self.region<EOL>)<EOL><DEDENT>except ResourceNotFoundError as e:<EOL><INDENT>raise GCECloudException(<EOL>'<STR_LIT>'.format(<EOL>id=self.running_instance_id, error=e<EOL>)<EOL>)<EOL><DEDENT>return instance<EOL>
Retrieve instance matching instance_id.