thanks for the quick answer. But i checked the sahara client cli again by the following and cannot find the scale command, i am using the juno mater build is this a potential bug or not?

stack@sahara:~/devstack$ sahara bash-completion | grep cluster
--cluster job-template-delete node-group-template-delete --output-data cluster-delete job-list image-add-tag --user --file -h cluster-template-show job-binary-show --job-template --input-data node-group-template-create cluster-create data-source-list data-source-delete cluster-template-create help job-create image-list job-binary-list job-binary-data-list --description image-register job-binary-delete data-source-create cluster-show image-unregister job-binary-create image-remove-tag job-template-list plugin-list --tag cluster-template-delete job-binary-data-create job-template-create --main cluster-template-list image-show --param job-binary-data-delete --arg --name --password node-group-template-list --id --url data-source-show node-group-template-show --json --type job-delete plugin-show --help --config job-template-show --username --lib job-show cluster-list

Oh, I see. You are talking about sahara shell. It has very limited functionality now and scaling is not implemented. Here is TODO for it: https://github.com/openstack/python-s... I have no information on when it will be implemented.

so i see, the python-saharaclient is different with the sahara shell, thanks for your answer.