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OpenStack is not supposed to provide this functionality.

See Ansible for example, it has modules to manage many aspects of Linux hosts and hides a bit of complexity of Linux tools. You might leverage it in case you use Ansible (information about your hosts/authentication is already populated). Furthermore it might help in making further handling of this changes less error-prone. Or in general speaking: this is role of your installation/lifecycle management tool that you might be using for your deployment.

'Clicking button' in OpenStack context is about Horizon Dashboard, but integrating Horizon with management of physical hosts practically doesn't exist. At least when it comes to vanilla Horizon.