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As the infra-local-controller is supposed not having Internet access, we have to prepare everything into the ISO. Every service should have a preparation script which prepares every files needed for setting up the service. For example, we need to have a preparation script for Kubernetes service, to download kubelet package and kube-api image. All the preparation scripts are called before mkisofs.
The host reboots after ISO installation. Once reboot, the first thing we have to do is setting up kubernetes. Because we are supposed to run services on the Kubernetes, i.e. apt repo, docker registry, etc.