- `source_image` (string) - The ID or full URL to the base image to use. This is the image that will be used to launch a new server and provision it. Unless you specify completely custom SSH settings, the source image must have cloud-init installed so that the keypair gets assigned properly. - `source_image_name` (string) - The name of the base image to use. This is an alternative way of providing source_image and only either of them can be specified. - `source_image_filter` (ImageFilter) - The search filters for determining the base image to use. This is an alternative way of providing source_image and only one of these methods can be used. source_image will override the filters. - `flavor` (string) - The ID, name, or full URL for the desired flavor for the server to be created.