[ovirt-users] Question about cloud-init

Hello, I have a question about cloud-init: After installing vm, I installed cloud-init immediately, and enabled its four services, and then I can use cloud-init in the admin interface. However, I don't know how cloud-init knows where to get the relevant information (such as host name, SSH secret key, etc.) that I configured on the admin interface ? For I haven't configured the data source for cloud-init. Why it can works ? Thanks!