Thank you very much for your work. I use your script on three nodes now.
Just one Question: Why don’t you added #!/bin/bash at the top?
And you can strip the --agree-dev-preview now 
Thank you very much for your work. I use your script on three nodes now.
Just one Question: Why don’t you added #!/bin/bash at the top?
And you can strip the --agree-dev-preview now