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I might be wrong here but as far as openstack VM's are concerned there is no provision in openstack by which we can access them via REST.

If your use case if you want to install services after the VM is created remotely and REST is not a mandatory thing to use then you can create scripts and in those scripts you can specify what to install and what to configure.

In horizon also there is an option that comes by the name of Customization-script( its for that purpose only)

This service is facilitated through neutron-metadata-agent which enable us to customize the VM after they are launched. There is a separate project known as cloud-init which helps doing this.

It is supported both for Linux as well as Windows VM's